Forficulide and Chelisochide, famalies of Dermatoptera. 107 
tum angulatim incurva, convergentia, in tertia parte apicali recta, 
apice mucronata; ? recta, simplicia. 
Type of the genus.—Ancistrogaster kervillet, Burr, Ann. 
Mag. N. H. ser. 7, vol. xvi, p. 490. (1905.) (Venezuela.) 
In appearance resembles Prwos, but the elytra are com- 
plete, the keel dies out half-way down the elytra, the 
abdomen is depressed and laterally hooked, and the 
forceps bowed strongly outwards and inwards in a lozenge 
form. 
In general appearance this genus has even all the aspect 
of a typical Ancistrogaster, but in the feeble carina of the 
elytra, in the attenuate abdomen and somewhat narrowed 
last dorsal segment, it approaches the Opisthocosmiine, but 
the depressed and dilated abdomen, and the form of the 
forceps are characteristic of Ancistrogastrine ; the last 
dorsal segment, although somewhat attenuated, is still 
much broader than long, distinctly transverse, and _rect- 
angular. 
The single species, recorded from Venezuela, is very 
distinct. 
It differs from Praos in the complete elytra, with a 
shorter costal carina, in the less sharply flattened abdomen, 
and the strongly bowed forceps, which include a lozenge- 
shaped area; from Ancistrogaster, Vlax and Sarakas it 
differs in the absence of wings and form of the carina of 
the elytra. 
Genus 3.—PRAOS,* nov. gen. 
Corpus depressum; antenne graciles ; caput leve, margine postico 
emarginato ; pronotum quadratum, marginibus omnibus rectis, sub- 
latius quam longius, deplanatum ; elytra rudimentaria, trapezoidea, 
margine externo usque ad apicem carinata, margine postico oblique 
truncata, margine interno quam externo multo brevius, scutellum 
sat magnum triangulare eflicientia ; ale null ; pedes longi, graciles, 
haud incrassati; abdomen valde deplanatum et dilatatum, plicis 
lateralibus distinctis ; lateribus segmentorum 3-6 tuberculis distinctis 
instructum ; segientis 7 et 8 lateribus acute recurvis ; segmentum 
ultimum dorsale ¢ breve, latum, valde transversum, medio impresso, 
bituberculato, angulis externis carinatis; forcipis bracchia basi valde 
remota, depressa, arcuatim incurva, intus dentata, apice mucronata. 
Type of the genus.—-Ancistrogaster perdita, Borelli, Boll. 
* Gr, mpdos=meek. 
