MORGAN HEBARD 
427 
occur to warrant the generic separation of the species perditus and 
championi and, in consequence, Vlax must fall as a synonym of 
Praos, which name has page priority. The genus Pro os result- 
antly is found to include one species with, and one without, fully 
developed wings. Proceeding further, from the material of 
tolteca before us (assigned by Burr to Vlax),^^ of gulosn (originally 
referred to Ancistrogaster) , and the excellent description and 
figures of impennis (assigned by Burr with a queiy to Praos), 
silvestrii and dugesi (assigned by Borelli and Burr to Paracosmia, 
of which silvestrii is the genotype), it is clear that these species 
are congeneric, tolteca and guloea having fully developed wings. 
As a result, the known Mexican species of the Ancistrogastrinae 
are all referable to Paracos77iia,\vith the exception of ATficistrogaster 
spinax and 7mci7iatus. 
PARACOSMIA Borelli 
1909. Paracosmia Borelli, Boll. Lab. Zool. Scuola Agr. Portici, iii, p. 323. 
The following modifications of the original description are 
made. Wings concealed or fully developed. Abdomen of male 
more or less dilated mesad or meso-distad, dorsal surface weakly 
convex; stink gland of third segment small, of fourth segment 
large; fifth, or fifth, sixth and seventh dorsal segments weakly 
angulato-produced dorso-laterad, in decreasing ratio caudad and 
there feebly keeled. Dorsal surface of female abdomen with 
stink glands, but without dorso-lateral production. Disto- 
dorsal abdominal segment of male with sides straight or angulato- 
emarginate, dorsal surface little specialized in contour, margins 
ventrad on each side, at juncture with subgejiital plate, produced 
in two minute, angulate projections, with apices blunt. Male 
forceps variously armed. 
Paracosmia tolteca (Scudder) (Plate XXVIII, figures 17, 18 and 19.) 
1876. Forficula tolteca Scudder, Proc. Bost. Soc. Nat. Hist., x^uii, p. 261. 
[INIexico.l 
28 Two other species, intermedius and festae, were assigned to Vlax by Burr. 
These are both South American, and would appear to represent a genus, or 
genera, not found in the Central American faima. 
2* As given by Borelli for the genus, the caudal metatarsus is equal to the 
combined length of the second and third joints in P. gulosa, but in P. tolteca 
it is distinctly more elongate than that measurement. We do not feel that 
sufficient difference is, however, shown by tolteca to warrant generic separation. 
TRANS. AM. ENT. SOC., XLIII. 
