No. 22.] HYMENOPTERA OF CONNECTICUT. I3I 



defined walls; frontal crest prominent but not distinctly- 

 limited; body yellowish or pallid, with antennae, a large 

 spot on the vertex, mesonotum, metanotum, and dorsum 

 of abdomen, black. Length 7 mm hyalina 



30. Scutellum wholly or in part black; saw-guides rather pointed, 

 lower margin regularly pointed, upper margin straight or 

 slightly concave, bordering hairs very minute; clypeus dis- 

 tinctly but not very broadly emarginate; ocellar basin with 

 sides distinctly, rather sharply raised; frontal crest 

 rounded, broken at middle; median fovea circular, shallow; 

 body light yellowish, with antennae, a spot on vertex ex- 

 tending onto occiput, lobes of mesonotum except lateral 

 edges, metanotum, and dorsum of abdomen centrally ex- 

 cept apex of last segment, black or dark brown; hind 

 tibiae and tarsi more or less infuscated. Length 6 mm. 



vertebrata 

 Scutellum pale; saw-guides rather narrow, slightly concave 

 above, rounded at apex; clypeus circularly emarginate; 

 ocellar basin distinctly limited; frontal crest large, slightly 

 broken at middle; median fovea expanding basally; body 

 pallid or yellowish, with antennae above, spot on vertex 

 extending to bases of antennas, center of lobes of mesono- 

 tum, metanotum, and central portion of abdomen on dor- 

 sum, brownish black; tibiae and tarsi slightly infuscated. 

 Length 6-6.5 mm integra 



SI. Body entirely without black or brownish markings of any 



sort. Length 7 mm monochroma 



Body, at least in part, with black or brownish markings 32 



32. Body greenish luteous, with first seven dorsal abdominal seg- 



ments, saw-guides, mesothorax in part, metathorax, spot 

 on pleurae below wings, and two basal segments of anten- 

 nae, black; clypeus hardly emarginate; tips of tarsi black- 

 ish ; stigma and costa pale green. Length 7 mm stigmata 



Body yellow or pallid, without black or brownish band on 

 dorsum of abdomen 33 



33. Frontal crest prominent, broken at middle, or strongly bi- 



tuberculate; median fovea broad, shallow; clypeus broadly 

 but not deeply notched; ocellar basin with distinctly de- 

 fined but rounded lateral walls; saw-guides tapering, 

 straight or slightly concave on upper margin; body light 

 yellowish, with narrow border to ocelli, small spot on 

 occiput, spots on lobes of mesonotum, sometimes wanting, 

 apex of scutellum, and spot between cenchri, brownish 

 black; costa and stigma greenish hyaline. Length 5-6 mm. 



mendica 

 Frontal crest unbroken; median fovea deep, extending lat- 

 erally over bases of antennae; clypeus deeply, circularly 



