264 BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



MAI.KS. 



Scutclluui not Icugtbeueci, semicirculiir, citbor Hat, couvex or cupuliforni, au«l 

 Tinaiiiied 5 



Scutellum lengthened, never semicircular, or wlicn shortened it is compressed 



at sides and furnished with an awl-shai)cd thorn or tubercle at tij) . 2 



2. Scutellum with a strong awl-shaped thorn at tip 3 



Scutellum with a short thorn or tubercle at ti]! 4 



Scutellum lengthened, triangular, often produced into a long, acute spine. 



Thorax strongly compressed from the sides. 



Head large, rounded or quadrate Pikstoi'leciia Forst. 



Thorax not strongly compressed at sides. 



Mesouotal furrows deep, parallel posteriorly Xestoxotus Fiirst. 



Mesonotal furrows very feeblj' impressed or wanting Amblyaspis Forst. 



3. Lateral ocelli nearer the margin of the eye than to the apical ocellus. 



Laptacis Fiirst. 

 Lateral ocelli not nearer tlie margin of eye than to the ai)ical ocellus. 



IsoKiiOMBUS Fiirst. 



4. Abdomen much lengthened Poi.Y.Mi-X'l'.s Fcirst. 



Abdomen not especially lengthened. 



Ocelli their width from the margin of the eye Sactogastku Fiirst. 



Ocell i close to the eye margin ' S ynope a.s Fiirst. 



5. Scutellum convex 6 



Scutellum cupuliform as in Cyuipid genus Eucoila..C(ELOPKLTA Ashm. gen. nov. 

 Scutellum quite flat. 



Mesonotal furrows wanting or distinct; autenna; 10-jointed. 



Scutellum separated from mesonotum by a delicate transverse grooved line, 

 not foveate at base; autennai subclavate, not verticillate. 



Anopedias FiitsL. 

 Mesonotal furrows usually distinct; antennai verticillate. 



A.MITU.S Haldeman. 



6. Scutellum with a tuft of hair at tip Triciiacis Fiirst. 



Scutellum without' a tuft of hair at tip. 



Margin of abdomen very broadly detiexed Hypocampsis Fiirst. 



Margin of abdomen normal. 



Thorax short ; the scutellum pillow-shaped, separated from the mesonotum 

 by a deep furrow; mesonotal furrows rarely distinct or comiilete. 



No keel between the antennte Polygnotus Fiirst. 



A sharp distinct keel between the antenniB, third joint strongly dilated. 



EiiiTRissoMERUS Ashm. gen. nov. 

 Thorax more elongate ; scutellum not separated from the mesonotum by a 

 deep furrow ; mesonotal furrows distinct, complete, rarely incom- 

 plete. 

 Lateral ocelli nearer tht; margin of the eye than to the apical ocellus. 



Pl.ATYGASTEK Latr. 



Lateral ocelli nearer to the apical ocellus than to the margin of the eye. 



IsoGYiiUS Fiirst. 



