264 BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



MAI.KS. 



Scutelliiiii not Icn^theneii, sL'tuioirculiir, either flat, convex or cnpuliforni, and 



unaniieil 5 



Sciitelluni lengthened, never Heiuicirciihir, or when shorteneil it is compressed 



at sides and fnrnished with an awlshaped thorn or tnliercle at tip . 2 



2. Scntellnni with a stronj^ awl-shaped thorn at tip 3 



Seiitellnin with a short thorn or tnhcrcle at tip 4 



Scntellnni .'engthened, triangular, often jaoduced into a long, aiiite spine. 



Thorax strongly <(nupressc<l irom +lio sides. 



Head large, rounded or (luadrate I'lKSTOFLKI'RA Forst, 



Thorax not strongly compressed at sides. 



M<!8ouotal furrows deeji, parallel posteriorly Xkstonotus Forst. 



Mesonotal furrows very feebly impressed or wanting A.mmi.ya.si'Is Fiirst. 



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



Laptacis Forst. 

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



IsoKHOMBUs Fiirst. 



4. Abdomen ninch lengthened Poly.mecus Fiirst. 



Abdomen not especially lengthened. 



Ocelli their Avidth from the margin of the eye. ..■. Sactogaster Fiirst. 



Ocelli close to the eye margin Synopkas Fiirst. 



5. Scntellum convex 6 



Scutellum cnpuliforni as in Cynipid genus Encoila..C(KLOPEi.TA Ashm. gen. uov. 

 Scntellum iiuite Hat. 



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



Scntellum separated from mesonotum by a delicate transverse grooved line, 

 not foveate at base; autennse subclavate, not verticillate. 



Anoi'Eihas Fiirst. 

 Mesonotal furrows usually distinct ; antennse verticillate. 



Amitl'S Haldemau. 



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



Scutellum without a tuft of hair at tip. 



Margin of abdomen very broadly detlexed 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 complete. 



No keel between the antenna} PoLYCiNOTi's Fiirst. 



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



Eritrissomerus Ashm. gen. iiov. 

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

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

 plete. 

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



I'r.ATYG ASTER Latr. 

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



ISOCYBUS Fiirst. 



