32 BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



ItlfHouDtal furrows \vantiii;r or iiidiHtinct. 

 Antcmiii- IJt-Joiiitcd. 



MiiudiblcH loiif^, slfiidcr, bilid Apknksia Wcstw. 



Miiudihh'S broad, 4- to ri-di^utatt). 



SfiitcUmii with ii t rails vtrso fovea at base (Ei-vitls) 



Sciitellum with 2 fovea' at biisc (Mksiths) 



Aiiti'iina- 12-.joiiit<'d. 



Eyes hairv Axoxrs Thoiiis. 



6. Autcuiia- 12-joiiitcil I'KiiisE.Mls I'drsttir 



Anteuiia^ l.'5-joiutcd (ioNio/u.s Fiirstor 



PRISTOCERA King. 



Weber ii. M(dir. Heitr. Natiirk. ii, i>. 202-6, id. iv (1><1<»), Westw. ThcH. Eiit. Oxoii, p. 

 162 (1874). 



(Typti /'. dipreHsa Fabr. ) 



Hesul, in i obloiig-ovul, convex with 3 ocelli; in 9 Ijirge, oblong 

 quadrate, the ocelli wanting; tlu; eye.s very sniiill. 



Antenna? in both sexes 13 jointed, in $ lonj;*, tapering toward tips; 

 the scape stout, curved, lumctate, the pedicel minute ; the flagellar joints 

 are liliiorm or subtiliforni, trun(;ate at tip«5. three or four times longer 

 than thick, hairy or pubescent; in 9 much shorter, submoniliforni, the 

 last joint somewhat longer than the penultimate. 



Maxillary i)alpi C-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: Prothorax in i triangular, anteriorly subtruncate, deeply 

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

 thorax convexJy rnunded posteriorly; in 9 the prothorax is subquad- 

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

 pressed line on each side; the scutellum i^resent; metathorax usually 

 more or less strongly contracted at sides towards the base. 



Front wings in $ with an oblong or oval stigma, an inconq)lete 



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



holding the wing up to the light other cells uiay be seen; the second 



basal cell is a little longer than the first along the median nervure. The 



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



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

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

 greatly elongated, pointed at apex. 



Legs in $ rather long and not nearly so much swollen as in Epyris, 

 Mesitius, etc.; the anterior femora a little thicker than the posterior, 

 the anterior and middle tibitc shorter than their femora, armed with 

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

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

 shorter, stouter, the tibia; outwardly spiuulose, the claws simple, not 

 toothed. 



