^0. 22.] HYMENOPTERA OF CONNECTICUT. 363 



Basal joint of hind tarsi at least twice as long as second, 

 third, fourth, and fifth joints united; second, third, and 

 fourth joints of tarsi longer than fifth, second with a 

 long spinous process extending outwardly; abdomen very 

 distinctly compressed from side to side, spatulate, and 

 distinctly longer than head and thorax united; first to 

 fourth or even including fifth segment nearly equal in 

 length to each other IBALIID^ p. 442 



figitidje. 



Key to Genera. 



1. Abdomen ovate, compressed or subcompressed from side 



to side, in some species distinctly petiolate, its apex usu- 

 ally pointed 2 



Abdomen short, globose or subglobose, second* segment 

 longer than the others; scutel smooth and convex; hind 

 tibiae with only one apical spur; pronotum and legs without 

 leaf-like dilatations; claws simple; mesonotum entirely 

 without notauli; wings fully developed, marginal cell com- 

 pletely closed; antennae 13-jointed in the female, 14-jointed 

 in the male; scutel not foveate at base; wings much longer 

 than abdomen Xystus p. 367 



2. Scutel without a cup-like elevation above, usually foveate at 



base, spined or cone-shaped 3 



Scutel with a cup-like elevation above; second abdominal 

 segment always the longest and usually occupying most 

 of the surface of abdomen; hind tibiae with two apical spurs 8 



3. Abdomen distinctly petiolated, second segment usually some- 



what longer than third; scutel more or less conical, but 

 never ending in a spine, separated from mesonotum by a 

 suture or furrow, and with two oblique fovea? at its base; 

 petiole of abdomen usually longer than hind coxae, and 



smooth; propodeum not areolated Anacharis p. 365 



Abdomen sessile or subsessile, or with a short petiole, sec- 

 ond segment shorter than third 4 



4. Second abdominal segment not prolonged dorsally, as seen 



from the side, and not tongue-shaped; cheeks margined; 

 eyes hairy or pubescent; mesopleurae separated from meso- 



sternum by a sharp, longitudinal ridge or carina 6 



Second abdominal segment prolonged dorsally, as seen from 

 the side, tongue-shaped 5 



5. Scutel not spined; mesonotum scabrous, opaque, with two dis- 



tinct furrows and a median carina; scutel elevated and 

 truncate posteriorly and with a channel throughout; mar- 

 ginal cell open at base and along fore margin, confluent 

 with costal cell; female with antennae 13-jointed, and 



