Cataglyphis cubicus (Forel, 1903) stat. nov. (Hymenoptera, Formicidae) y ♂ nov., grupo albicans, de Asilah, costa atlántica de Marruecos

The male of Cataglyphis cubicus (Forel, 1903), (Hym. Formicidae), group albicans, from Asilah, NW of Morocco, is described. This species is separated from C. rosenhaueri (Emery, 1906), from SW of Spain, not only by the genitalia, but also by the morphometry of workers.Se describe el macho de Cataglyphis cubicus (Forel, 1903) (Hym. Formicidae), del grupo albicans, de Asilah, litoral noroeste de Marruecos. Se separa esta especie de C. rosenhaueri(Emery, 1906), del suroeste de España, no sólo por la genitalia de los machos, sino también por la morfometría de las obreras

Particularitats de la mirmecofauna del Cap de Gata (Almeria)

The study of the myrmecofauna of Cabo de Gata (Almería) shows the presence of 20 species and 12 genera. It must be noted the presence of Cardiocondyla batesii, till now only found in Almería and Murcia. Camponotus sicheli is also localised in Almeria and the Balearic Islands. Monomorium subopacum is also abundant in the zone, but scarce in Andalucía. The 80 % of the myrmecofauna is Iberomauritanic and African, and the remaining 20 % is of Euromediterranean origin

Communication: Inferring the equation of state of a metastable hard-sphere fluid from the equation of state of a hard-sphere mixture at high densities

A possible approximate route to obtain the equation of state of the monodisperse hard-sphere system in the metastable fluid region from the knowledge of the equation of state of a hard-sphere mixture at high densities is discussed. The proposal is illustrated by using recent Monte Carlo simulation data for the pressure of a binary mixture. It is further shown to exhibit high internal consistency.Comment: 4 pages, 2 figures; v2: Simulation data for one-component hard spheres included in Fig.

Cataglyphis cubicus (Forel, 1903) stat. nov. (Hymenoptera, Formicidae) y ♂ nov., grupo albicans, de Asilah, costa atlántica de Marruecos

Se describe el macho de Cataglyphis cubicus (Forel, 1903) (Hym. Formicidae), del grupo albicans, de Asilah, litoral noroeste de Marruecos. Se separa esta especie de C. rosenhaueri(Emery, 1906), del suroeste de España, no sólo por la genitalia de los machos, sino también por la morfometría de las obreras.The male of Cataglyphis cubicus (Forel, 1903), (Hym. Formicidae), group albicans, from Asilah, NW of Morocco, is described. This species is separated from C. rosenhaueri (Emery, 1906), from SW of Spain, not only by the genitalia, but also by the morphometry of workers

Contact values of the particle-particle and wall-particle correlation functions in a hard-sphere polydisperse fluid

The contact values $g(\sigma,\sigma')$ of the radial distribution functions of a fluid of (additive) hard spheres with a given size distribution $f(\sigma)$ are considered. A ``universality'' assumption is introduced, according to which, at a given packing fraction $\eta$, $g(\sigma,\sigma')=G(z(\sigma,\sigma'))$, where $G$ is a common function independent of the number of components (either finite or infinite) and $z(\sigma,\sigma')=[2 \sigma \sigma'/(\sigma+\sigma')]\mu_2/\mu_3$ is a dimensionless parameter, $\mu_n$ being the $n$-th moment of the diameter distribution. A cubic form proposal for the $z$-dependence of $G$ is made and known exact consistency conditions for the point particle and equal size limits, as well as between two different routes to compute the pressure of the system in the presence of a hard wall, are used to express $G(z)$ in terms of the radial distribution at contact of the one-component system. For polydisperse systems we compare the contact values of the wall-particle correlation function and the compressibility factor with those obtained from recent Monte Carlo simulations.Comment: 9 pages, 7 figure