5 p. : ill. ; 24 cm.Includes bibliographical references (p. [1])

Darlington, Philip Jackson, 1904-

Mutchler, Andrew Johnson.

American Museum of Natural History Scientific Publications

AMERICAN MUSEUM NOVITATESPublished byNumber 924 THE AMERICAN MUSEUM oF NATURAL HISTORY May 4, 1937New York CityTHREE NEW SPECIES OF TYTTHONYX FROM CUBABY ANDREW J. MUTCHLERThe first records of the genus Tytthonyx from the West Indies werepublished by Mr. C. W. Leng and the present author (1922, Bull. Amer.Mus. Nat. Hist., XLVI, pp. 489-490). They included two species fromPuerto Rico and one from Cuba. Later (1923, Amer. Mus. Novitates,No. 63, pp. 8-9), the present author described a species from Antigua.A fifth species was described (Pan Pacific Entomologist, 1934, pp. 30-32)by Howard E. Hinton.The three forms herein described were collected by Dr. P. J. Darling-ton of the Museum of Comparative Zoology and sent to the AmericanMuseum for determination. They are unlike any of the previously de-scribed species, being mostly red or yellowish red in color with the blackunderwings protruding from beneath the short elytra.The red color is similar to that of some of the species of Thonalmus.Two of the species have the elytra unicolorous red but the other has thebasal parts red and the tips black. In all three of these species theprotruding underwings are black. This combination of colors, at acasual glance, makes these forms appear as though related to the genusThonalmus.The color of these species will suffice to separate them from the otherdescribed West Indian forms. The males of the three forms hereindescribed may be readily separated by the shape of the emarginationof the apical ventral segments of the abdomen. In only one of thesethe oedagus is visible in the emargination.The drawings illustrating these forms were made by Mr. Pierre Noel,who has allowed to some extent for distortions which are likely to occurin the bodies of insects which are as soft as the Cantharidae. A goodlight and a somewhat high magnification are necessary to bring out someof the characters mentioned in the following descriptions. The bin-ocular microscope magnifications used in making.the following de-scriptions were 12.5 X oculars and a 6.8 X objective.AMERICAN MUSEUM NOVITATESTytthonyx rutilis, new speciesFigures 1 and 2Elongate. Yellowish red. Antennae (excepting basal joint), underwings,palpi, apex of femur, tibiae and tarsi, black. Apical abdominal segments of femaleblack, of male dusky. Head finely punctulate and sparsely covered with short palepubescence; antennae compressed somewhat strongly serrate from third joint; firstjoint somewhat club-shaped, color above dark brown to black, beneath yellowishred, about one-third longer than second, second and third nearly equal in length;eleventh elongate, somewhat pointed, surface somewhat granulate and with shorthairs. Pronotum with margins raised, front angles broadly rounded, hind angles lessbroadly rounded; disk with median impressed longitudinal line, surface finely punc-tate and sparsely covered with very short, pale pubescence. Elytra about two andone-half times longer than the thorax, slightly narrowing from about apical third,apical angles broadly rounded in female, less so in male, surface coarsely punctateand costate, a short costa beginning just below apex of the scutellum and extendingto about middle of elytra, another more prominent oblique costa beginning at thehumerus and extending to near apex of elytra; there is another costa beginning atthe side behind the humeri and extending back obliquely to near the apex. Thereare also other short oblique raised lines on the disk which can be seen under highpower. The disk is sparsely covered with very short pale pubescence which becomesmore dense along the margins. Length, 6-8 mm.MALE.-The under surface is similar in color to the upper with the exceptionthat the last two abdominal segments are slightly darker. These two segments(Fig. 2) are emarginate, the emargination on the penultimate is ovate in form; thelast segment is opened at the base but closed at the apex. (If these segments werebrought together, it would possibly appear as a single opening.) The sides of thelast abdominal segment are impressed basally.FEMALE.-The two apical segments of the abdomen are black and finely punc-tured; the seventh segment is short, rounded at the sides and with a circular emargi-nation at the apex; the dorsal part is also emarginate and the next to last dorsalsegment is impressed at the middle, raised at the sides and with two small hairyprotuberances at the apical angles.Length, 6-8 mm.Holotype male and allotype female in the collection of the Museum of Com-parative Zo6logy. These were collected by Dr. P. J. Darlington at Soledad (Cien-fuegos), Cuba.This species although similar to rubidus is paler red in color. Theelytra are less broadly rounded at the apex, and the emargination of theapical abdominal segments are totally different.Tytthonyx darlingtoni, new speciesFigures 4 and 5MAT=.-Elongate, clothed with fine sparse pubescence. Head red, micro-scopically reticulate punctulate, sparsely covered with very short pale pubescence;antennae excepting apical joint black, strongly serrate from third to tenth joint,basal joint slightly club-shaped, nearly twice as long as the second, eleventh joint2 [No. 9241937] NEW SPECIES OF TYTTHONYX FROM CUBAIoFig. 1. Tytthonyx rutilis, new species.Fig. 2. Tytthonyx rutilis, apical ventral segments of male.Fig. 3. Tytthonyx rubidus, new species, apical ventral segments of male.Fig. 4. Tytthonyx darlingtoni, new species.Fig. 5. Tytthonyx darlingwoni, apical ventral segments of male.3AMERICAN MUSEUM NOVITATESelongate ovate, pale yellowish brown in color; palpi black. Pronotum red, abouttwo-fifths wider than long, surface smooth, pubescence pale, very short and sparse,margins somewhat raised; disk with a median longitudinal impression and with asomewhat shallow broader impression on each side, front and hind angles rounded.Elytra slightly more than half the length of the body, parallel to about the apicalthird, then gradually narrowing to apex, sutural and lateral angles broadly rounded;red at base, apex black, covered with short, sparse, red pubescence, surface con-fusedly punctate giving it a roughened appearance, each with a more or less distinctoblique costa reaching from near the humerus to within a short distance from theapex. Underwings black. Body beneath red with middle of penultimate and lastsegment black; sixth segment emarginate at apex; seventh segment with an emargi-nation on both ventral and dorsal parts which makes this segment appear divided(Fig. 5); margins of apex and those of emargination with bristle-like black hairs.Femora, tibiae and tarsi black. Length, 5.5-7 mm.Type and two paratypes collected by Dr. P. J. Darlington at Buenos Aires,Trinidad Mts., Cuba, May 8-14, 1936, at an elevation of 2500 to 3500 feet.Type and one paratype in collection of the Museum of Comparative Zo6logy.One paratype in the collection of The American Museum of Natural History.The antennae of this species are more strongly serrate and the emar-gination of the apical ventral segments differs from the other two speciesherein described. The elytra are similar in shape to the next rutilisbut only about two-thirds of the elytra are red, the apex being black.Tytthonyx rubidus, new speciesFigure 3Elongate. Head, thorax, elytra and basal abdominal segments red; palpi, an-tennae, underwings, legs and two apical segments of abdomen, black. Head longerthan wide, very finely (not closely) punctate, and with very short pale pubescence.Pronotum about one-third wider than long, margins raised; disk very slightly convex,with an indication of a longitudinal median impression basally and apically; atbasal half of the disk there is a vague impression, the base of which is narrow but ex-pands toward the apex; the disk is extremely finely punctate and sparsely coveredwith very short, fine pubescence; front somewhat narrowly rounded; hind anglesobtuse. Scutellum of the same color as the pronotum. Elytra about two-thirdslonger than the thorax, darker red in color than head and thorax; pubescence pale,short and more or less sparse; punctures coarse and irregular, quite sparse at basebut becoming more closely placed and more irregular apically; viewed from the sidethere are on each elytron four apparent costae which extend neither to the base norapex, the outward costa appearing the most prominent; from the humerus is a moreor less wavy costa-like ridge which beyond the apical half is coarsely punctured andseparated so as to form a shorter costa. Body beneath excepting sides and apex ofabdominal segments with short, sparse pubescence; these latter have longer andcoarser hairs. Length, 5-5.5 mm.MALE.-Last ventral segment (Fig. 3) with a broad arcuate emargination. Thesides and apex of the segment are strongly punctate with stiff hairs arising from thepunctures. Part of the oedagus protrudes through the middle of the emargination.4 [No. 9241937] NEW SPECIES OF TYTTHONYX FROM CUBA 5It is nearly parallel-sided but broadens slightly apically and the lower surface issparsely punctured apically, with stiff hairs arising from the punctures.FEMALE.-Sixth abdominal segment broad at base, apex broadly but very slightlyemarginate; at the sides and apex there are a few short somewhat coarse hairs;slightly protuding beyond this segment is a narrower segment which in our specimensis apparently widely open at the apex. It is margined with stiff dark hairs andthe opening is lined with paler hairs.Holotype male, allotype female, and three male and one female paratypes in collec-tion of the Museum of Comparative Zoology. One male and one female paratype incollection of The American Museum of Natural History. All of the above werecollected by Dr. P. J. Darlington, at Buenos Aires, Trinidad Mts., Cuba, May 8-14,1936. Altitude 2500 to 3500 feet.The elytra of this species are similar to darlingtoni in form but theyare not black at the apex; the surface sculpture also differs. Theemargination of the apical ventral segments differs from both of thepreceding species.

New species of Tytthonyx from Cuba

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