244 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [BuU. 



case, they are behind the mfddle, then abdomen com- 

 pressed or club-shaped 6 



First abdominal segment bent or curved toward its apex 

 in profile, abdomen pedunculate and wider than thick, or 

 depressed 8 



6. Ovipositor, when exserted, not nearly half the length of ab- 



domen, rarely longer than this, sometimes not at all ex- 

 serted 7 



Ovipositor, when exserted, at least nearly half the length of 

 abdomen, which is sessile or subsessile and depressed; 

 when abdomen is subsessile or pedunculate, as is rarely 

 the case, then head is spherical or cubical; areolet triangu- 

 lar or wanting, rarely pentangular 99 



7. Abdomen compressed throughout or with posterior half com- 



pressed, petiolate, rarely sessile or subsessile; areolet in 

 form of a triangle, trapezium, rhomboid or trapezoid, or 

 else wanting; face in most genera covered with short, 



dense, appressed, sericeous pubescence 9 



Abdomen usually broader than thick, or depressed through- 

 out, largest toward apex, which is often subcompressed 

 in female; elongate, fusiform, sessile or petiolate, in the 

 latter case never with areolet pentangular; areolet irregular, 

 triangular, or wanting, rarely pentangular 49 



8. Exserted portion of ovipositor elongate, rarely but slightly 



exserted; spiracles of first abdominal segment as a rule 

 nearer to each other than to apex of segment, which is in 

 some genera scarcely broader than more basal portion of 

 segment; areolet pentangular, quadrangular or incomplete; 

 wings sometimes imperfect; sternauli usually well devel- 

 oped; gastrocoeli subobsolete or faint, or else entirely ab- 

 sent I20 



Ovipositor not, or only slightly exserted; basal half or two- 

 thirds of first abdominal segment slender, its apex gener- 

 ally much expanded, its spiracles nearer to the apex than 

 to each other; base of second abdominal segment almost 

 always with lateral foveas or gastrocoeli; areolet pentangu- 

 lar; sternauli and notauli usually wanting, never well devel- 

 oped 128 



9. Cubitodiscoidal cell receiving only one recurrent vein 10 



Cubitodiscoidal cell receiving two or both recurrent veins; 



mid tibiae with two apical spurs; propodeum smooth or 



punctate 48 



10. Abdomen sessile or subsessile, or, if subpetiolate, petiole 

 not compressed but depressed; areolet rhomboidal; tarsi 



slender H 



Abdomen usually petiolate, sessile or subsessile only in a 

 few genera M 



