No. 22.] HYMENOPTERA OF CONNECTICUT. 253 



nervellus not disappearing toward base; propodeum above 

 not regularly areolated, and with only a very low, apical 

 median area; distance between ocelli greater than ocel- 

 locular line Eczetesis p. 299 



81. Male antennae not broadly thickened in middle; ovipositor 



distinctly exserted 82 



Male antennas broadly thickened in middle; ovipositor not 

 exserted Euceros p. 299 



82. Basal dorsal abdominal segments without transverse impres- 



sions; antennae rarely thickened in middle 83 



Basal dorsal abdominal segments with transverse impres- 

 sions; antennae slightly thickened in middle and tapering 

 toward apex Scopiorus p. 298 



83. Femora not thickened, or, if so, clypeus not separated from 



face by a suture; groove of clypeus not covered with a 



tuft of hair 84 



Femora thickened; grooves at sides of clypeus covered by a 

 tuft of hair; areolet present Erromenus p. 298 



84. Clypeus elevated and separated from face by a distinct trans- 



verse furrow, or, if not, propodeum polished and without 

 distinct carinae; tarsal claws not thickly pectinate at tip, 



but with comb-like teeth at base 85 



Clypeus not distinctly elevated and separated from face; pro- 

 podeum carinated Monoblastus p. 297 



85. Vertex not separated from occiput by a sharp ridge; pro- 



podeum without carinae; areolet wanting; metatarsi en- 

 larged; antennas longer than body Scolobates p. 297 



Vertex separated from occiput by a sharp ridge 



Polyblastus p. 297 



86. Tarsal claws not pectinate 87 



Tarsal claws pectinate; margin of first dorsal abdominal seg- 

 ment not hollowed out; areolet present; hind tibiae without 



a spur, subpetiolate; basal dorsal abdominal segment dis- 

 tinctly broadened from base toward apex . .Exenterus p. 301. 



87. First dorsal abdominal segment broadened ear-like at base, 



second dorsal abdominal segment at apex twice as broad 



as first at its apex Exyston p. 300 



First dorsal abdominal segment not broadened ear-like at 

 base Anecphysis p. 301 



88. Basal dorsal abdominal segment without a transverse im- 



pression; areolet wanting 89 



Basal dorsal abdominal segment with a transverse impres- 

 sion; areolet wanting; propodeum with an apical trans- 

 verse carina and a basal area, spiracles small and round; 

 nervellus broken below middle Diplazon p. 302 



