Spiders of the family Thomisidae

22 p. : ill. ; 24 cm.Includes bibliographical references

Bolas spiders

p. 225-254, [3] p. of plates : ill. ; 27 cm.Includes bibliographical references (p. 253-254)

Coriarachne versicolor and new species

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

American Dictynidae

21 p. : ill. ; 24 cm.Includes bibliographical references

Spiders from Mexico.

11 p. : ill. ; 24 cm.Includes bibliographical references

Desert spider community

25 p. : ill., maps ; 26 cm.Includes bibliographical references (p. 24-25)."The habitat of desert spiders is characterized, and multivariate analyses are used to assess interspecific relations among spiders inhabiting a Recent lava bed area in south-central New Mexico. General habitat types (i.e., lava bed, mixed grassland, and rangeland) account for most of the variability in species dispersion. The majority of the 90 species present in the area frequented the lava bed; the fewest species occupied the mixed grassland habitat bordering the flow. The spider community can be readily divided into eight groups within which frequent interaction is expected. Five of these groups are distinguished by general habitat association and temporal and seasonal considerations. The remaining groups consist of species that exhibit preferences toward specific habitat features (grasses and shrubs). In most, but not all cases, closely related species are separated by spatial and temporal differences. Factors of the physical environment are thought to allow the coexistence of congeneric Pellenes (Salticidae) and Dictyna (Dictynidae) for which no niche partitioning is apparent. Nine new species are described from the study area: Zorocrates karli, Theridion leviorum, Drassyllus mumai, Zelotes chicano, Zelotes anglo, Phidippus reederi, Phidippus volcanus, Metaphidippus shaferi, and Sitticus juniperi"--P. [1]

North American scorpions

p. 549-608 : ill., maps ; 27 cm.Includes bibliographical references (p. 607-608)."A systematic review of some American vejovine scorpions is presented with analyses of their characters and relationships. The subfamily Uroctoninae is rejected as a synonym of the Vejovinae. The genus Uroctonus, heretofore represented by the single taxon mordax, is redefined and the number of species increased to 14. Most of the characters on which the genus Uroctonus was formerly based were found to be intergradient to those of Vejovis. Although the genus is maintained on the basis of a combination of characters, it seems clear that the species were derived from the same basic stock. The trichobothrial patterns of Uroctonus and Vejovis are essentially identical and dffer strikingly from those of the related genera Anuroctonus and Hadrurus. The genotype Uroctonus mordax ranges from Oregon south into southern California and lives mostly in mesic, mountainous habitats. Most of the new species occur in California and Baja California but three others are found from southern Arizona to western Texas and Chihuahua. Two of the species, montereus and sequoia, are unusual in having only a single subdistal tooth present on the outer carina of the movable finger of the chelicera, instead of the normal two of the subfamily. A pale species with small eyes and slender, smooth cauda, grahami from Samwell Cave in California, seems to be a cave-adapted type, but its modifications may only indicate an endogean habit. Descriptions of various species of Vejovis are also included in the present paper. The identity of Vejovis minimus Kraepelin has been established by study of the type material from the Zoologisches Museum in Hamburg, Germany"--P. 551

Trapdoor spider

20 p. : ill., map ; 26 cm.Includes bibliographical references (p. 20)."The four known species of Cyclocosmia are diagnosed and described; all are characterized by a caudally truncate abdomen terminating in a heavily sclerotized disc that functions as a false bottom when the spider retreats headfirst to the base of its burrow. The species have similar genitalia but can be distinguished by details of the abdominal sculpturing and setation. Cyclocosmia truncata (Hentz) is redescribed for the first time on the basis of topotypical specimens of both sexes, and is recorded from Tennessee, northern Alabama, and northwestern Georgia. Specimens from southwestern Georgia and northern Florida formerly placed as truncata are assigned to C. torreya, new species. The Mexican genus Chorizops Ausserer is placed as a junior synonym of Cyclocosmia, and the male of its type species, Cyclocosmia loricata (C.L. Koch), described for the first time. The Chinese species Cyclocosmia ricketti (Pocock) is newly recorded from Thailand"--P. [1]

A revision of the American spiders of the family Atypidae (Araneae, Mygalomorphae). American Museum novitates ; no. 2704

39 p. : ill., maps ; 26 cm.Includes bibliographical references (p. 37-39)."The eight known New World species of Atypidae are diagnosed, described, and assigned to two genera on the basis of genitalic and somatic characters. Only one American species, Atypus snetsingeri Sarno, belongs to the Holarctic genus Atypus Latreille. The nominal species Atypus abboti (Walckenaer), A. rufipes Latreille, A. bicolor Lucas, A. milberti (Walckenaer), and A. niger Hentz are transferred to the endemic Nearctic genus Sphodros Walckenaer. Sphodros bicolor and S. milberti are newly synonymized with S. rufipes. Four new species are described: S. paisano from Texas and Tamaulipas, Mexico; S. fitchi from Nebraska, Kansas, Oklahoma, and Arkansas; S. atlanticus from Virginia, Illinois, North Carolina, and Georgia; and S. coylei from South Carolina"--P. [1]

Orbweaving spiders

52 p. : ill. ; 24 cm.Includes bibliographical references (p. 43)