32 BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



Mesouotal farrows wauting or iiuli.stiuct. 

 AuteuuiE 13-joiutcd. 



Mandibles long, slender, bilid Apknesia Westw. 



Mandibles broad, 4- to 6-dentate. 



Scntellnni witli a transverse fovea at base (Emus) 



Scutellnm Avitli 2 fove;e at base (Mesitiis) 



Antenna' 12-jointcd. 



Eyes bairy Anoxus Tbonis. 



6. Antennae 12-joiuted Pekisemus Forster 



Antenna> 13-jointed Goxiozus Forster 



PRISTOCERA King. 



Weber u. Molir. Beitr. Naturk. ii, p. 202-6, \)\. iv (bSlO), Westw. Thes. Ent. Oxon, p. 

 162 (1874). 



(Type 1'. dcprcstid Fabr.) 



Head, iu S oblong-oval, convex with 3 ocelli; in $ large, oblong 

 quadrate, the ocelli wanting; the eyes very small. 



Anteun;e in both sexes 13-jointed, in S long, tapering to^yard tips; 

 the scape stout, curved, punctate, the pe'dicel minute; the flagellar joints 

 are filiiorm or subtiliform, tiuucate at tii)8, three or four times longer 

 than thick, hairy or pubescent; in $ much shorter, submonililbrm, the 

 last joint somewhat longer than the i)enultiniate. 



Maxillary palpi G-jointed, long; labial palpi 3 jointed. 



Mandibles in S dilated at apex and crossing each other, 5-dentate, 

 teeth acute, conical, the outer tooth large; in 9 stout, curved, the apex 

 3- or 4-dentate, the outer tooth large, obtuse. 



Thorax: rrothorax in S trmngular, anteiiorly subtruncate, deeply 

 transversely impressed ; niesonotum with 2 to 4 distinct furrows; meta- 

 thorax con vexly rounded posteriorly; in 9 the i»rothorax is subquad- 

 rate, rounded anteriorly; inesothorax convexly rounded, with an im- 

 pressed line on each side; the scutellum present; metathorax usually 

 more or less strongly contracted at sides towards the base. 



Front wings in S Avith an oblong or oval stigma, an inconq»lete 



marginal, tMo basal, and one or two discoidal cells; and sometimes by 



holding the wing ui) to the light other cells maybe seen; the second 



basal cell is a little longer than the hrst along the median n.ervure. The 



9 is always wingless and very much smaller than the S . 



Abdomen in the S ovate, depressed, subpetiolated, the second and 

 third segments longer than the others ; in 9, it is variable, usually 

 greatly elongated, pointed at ajtex. 



Legs in S rather long and not nearly so nuich swollen as in J:]j)i/ri,s, 

 Mesitius, vtc; the anterior femora a little thicker than the posterior, 

 the anterior an<l middle tibi;e shorter than their femora, armed with 

 rigid bristles anteriorly; tibial spurs 1,2, 2, the outer spur of hind tibiji? 

 very long, the claws long curved, with a tootli within near base; in 9 

 shorter, stouter, the tibia' outwardly spinulose, the claws simple, not 

 toothed. 



