No. 22.] HYMENOPTERA OF CONNECTICUT. 179 



Second and third dorsal segments not fused, second divi- 

 sion of dorsum of abdomen with only one pair of spiracles; 

 all known forms winged; propodeum hardly extending 

 beyond base of coxae, upper edge of hind coxal sockets 

 or coxal line close to lower edge of abdominal socket or 

 abdominal line 4 



3. Cutting edge of mandibles turned inward, their tips meet- 



ing or overlapping when mandibles are flexed toward 



mouth VIPIONID^ p. i8l 



Cutting edge of mandibles turned outward, their tips 

 neither meeting nor overlapping when mandibles are flexed 

 toward mouth ALYSIID^ p. 2ii 



4. Frontal line shorter than clypeo-antennal line, or antennae 



inserted above middle of face; wings without a distinct 

 costal cell, i. e., with but three cells running to base of wing 5 

 Frontal line longer than clypeo-antennal line, or antennae 

 inserted below middle of face; wings with a distinct costal 



cell, i. e., with four cells running to base of wings 



STEPHANID^ p. 215 



5. Spiracles of first and second dorsal segments in or beyond 



middle; front wings with only one recurrent vein, first 



abcissa of cubitus present PAXYLOMMID^ 



Spiracles of first and second dorsal segments before middle; 

 front wings with two recurrent veins, first represented 

 by cubitodiscoidal vein, first abcissa of cubitus wanting 



BANCHID^ p. 216 



6. Abdomen with only one or two dorsal segments, or, where 



with more than two, then with second and third segments 

 fused, so that second division of abdomen has two pairs 

 of spiracles; propodeum hardly extending beyond base 



of hind coxae 7 



Abdomen always with more than two dorsal segments and 

 with only one pair of spiracles to the second division, sec- 

 ond and third dorsal segments not fused ii 



7. Abdomen inserted low down on propodeum , distinctly below 



middle of latter; upper edge of hind coxal sockets or coxal 

 line close to lower edge of abdominal socket or abdominal 



line 8 



Abdomen inserted high up on propodeum, in middle or above 

 middle of latter; upper edge of hind coxal sockets or coxal 

 line remote from lower edge of abdominal socket or ab- 

 dominal line CAPITONIID^ p. 768 



8. Cutting edge of mandibles turned inward, their tips meeting 



or overlapping when mandibles are flexed toward mouth 9 



