252 CONNECTICUT GEOL. AND NAT. HIST, SURVEY. [Bull. 



nal grooves not elevated; clypeus without two small teeth 



at apex; teeth of mandibles distinct Tryphon p. 293 



75- Second dorsal abdominal segment with distinct thyridia at base, 

 propodeum not entirely areolated; clypeus without teeth at 

 apex; apex of abdomen more or less slightly compressed; 

 stigma not longer than marginal cell, areolet entirely 

 wanting; mandibles toothed, lower tooth as long as upper; 

 apical segment of hind tarsi shorter than third; base of 

 discoidal cell as long as or longer than nervullus; malar 

 line shorter than mandibles are wide at base; first to third 

 dorsal abdominal segments not rugose, first not more than 

 twice as broad at apex as at base; clypeus without a trans- 

 verse row of bristles on anterior edge; sutures between 

 first to third dorsal abdominal segments not deep; clyp- 

 eus without lateral impressions; dorsulum, scutel, and first 

 to third dorsal abdominal segments shagreened; ridge of 

 vertex not broken in middle; lateral carina from spiracles 

 to apex of basal dorsal abdominal segments present; pro- 

 podeum with more or less distinct carinae 76 



Second dorsal abdominal segment without thyridia at base, or 

 else they lie very close to the base and are quite invisible; 

 nervellus broken at or below middle; propodeum not en- 

 tirely areolated; ridge of vertex not broken in middle; 

 base of discoidal cell as broad or broader than nervelus, 

 areolet usually entirely wanting; clypeus emarginate, al- 

 most semicircular on its anterior edge Sphecophaga p. 293 



76. Basal segment of hind tarsi inflated Holmgrenia p. 293 



Basal segment of hind tarsi not inflated; propodeum above 



finely and opaquely shagreened; clypeus more or less trans- 

 versely impressed at sides of anterior margin, which latter 

 is thereby elevated and more or less deeply emarginate 

 centrally Mesoleius p. 292 



77. Abdomen distinctly petiolate or subpetiolate 78 



Abdomen not distinctly petiolate, more nearly sessile 81 



76. Tarsal claws toothed with long and close-set teeth 79 



Tarsal claws toothed with fewer, shorter or more distant 

 teeth 80 



79. Clypeus scarcely elevated above face, hot compressed at tip. 



Rhorus p. 300 

 Clypeus distinctly elevated above face and compressed at 

 tip ; wings with an areolet Ctenopelma p. 300 



80. First dorsal abdominal segment much broadened behind spir- 



acles, following segments as broad as long; clypeus with- 

 out a transverse ridge; propodeum distinctly areolated .. 



Sjmipherta p. 299 

 First dorsal abdominal segment only partially broadened be- 

 hind spiracles, following segments not as broad as long; 



