No. 22.] HYMENOPTERA OF CONNECTICUT. 607 



Posterior angle of pronotum rounded or rather sharp but 

 always in front of or below tegula; wings not folded longi- 

 tudinally in repose 3 



2. Claws dentate; two forms, males and females 



EUMENID^ p. 634 



Claws simple; three forms, females, males, workers 



VESPIDyE p. 640 



3. No constriction between first and second abdominal seg- 



ments; discoidal cells obsolete, or if the first is present it 



is petiolate 4 



A constriction between first and second abdominal segments 

 which is usually deep; at least first discoidal cell well de- 

 fined, not petiolate 5 



4. Head oblong; antennae with twelve or more joints; stigma 



lanceolate; fore tarsi of female never chelate 



bethylid;e p. 608 



Head transverse, subquadrate or globose; antennae 10- 



jointed; stigma large; fore tarsi of female chelate 



DRYINID.E p. 613 



5. Legs very long, posterior femora when directed backward 



extending beyond middle of abdomen; mesepisternum with 

 a dividing cephalocaudal suture. .PSAMMOCHARID^E p. 625 

 Legs of usual length, posterior femora when directed back- 

 ward not reaching to middle of abdomen; mesepisternum 

 without a dividing cephalocaudal suture 



6. Sternellum large, sharply defined, extending between inter- 



mediate coxae so they are well separated; females winged; 



tibiae usually flattened with bristles exteriorly 



SCOLIIDJE p. 616 

 Sternellum not defined; intermediate coxae contiguous; or, if 

 coxae are somewhat separated, readily distinguished from 

 the preceding family by not having sternellum separated 

 from eusternum by a transverse suture; tibiae not flattened 

 and without a single rugose area; if rugose, nearly 

 uniformly so 7 



7. Clypeus with length and width subequal or nearly so; female 



winged; apex of abdomen in male without appendages; 



eyes deeply emarginate SAPYGID^E p. 620 



Clypeus transverse, very much wider than long; apex of the 

 abdomen in male armed or unarmed; eyes usually entire 8 



8. Female thorax divided into three parts; apex of abdomen in 



male armed with a single spine METHOCID.E p. 620 



Female thorax divided into two parts, prothorax being well 



separated; apex of abdomen in male without Spines 



MYRMOSID.E p. 621 

 Female thorax undivided; apex of abdomen in male with two 



spines MUTILLID.E p. 621 



