374 PROCEEDINGS OF THE NATIOl^AL MUSEUM vol. 83 



eyes vitreous; anterior margin of first tergite apparently trun- 

 cate carinifrons Crawford 



9. First tergite, exclusive of invaginated anterior portion, very 

 short, transversely linear or at least several times as broad 

 as long, usually smooth or weakly sculptured and generally 

 with anterior margin more or less elevated into a flangelike 

 projection that masks more or less posterior aspect of neck 



of propodeum^; species with thorax usually in part metallic 10 



First tergite more distinctly petioliform, rarely more than 

 three times as broad as long, as a rule more or less rugosely 

 sculptured and without a marginal flange anteriorly; species 

 with thorax usually black (Julvicornis group) 15 



10. First tergite smooth and without an elevated anterior margin; 



frons meeting vertex in a sharp keel ; area along inner margin of 

 parapsides usually coarsely roughened with punctures or 

 aciculations; insect as a rule in large part metallic. Scrobal 

 cavity deep and wide, occupying practically whole of front 

 and cutting a line tangent to anterior margins of lateral 

 ocelli, its margins acutely angulated. 



canadensis Crawford and canadensis nitidus, new variety 

 First tergite with anterior margin more or less distinctly ele- 

 vated and often sculptured; frons meeting vertex in more or 

 less of a curve; if meeting in a sharp keel, then insect black; 

 area along inner margin of parapsides smooth or only finely 

 sculptured or roughened 11 



11. Cheeks convexly rounded; head in front view, with very rare 



exceptions, distinctly transverse, not subtriangular; eyes 

 reaching or about reaching level of base of clypeus; umbili- 

 cate punctures on mesoscutum and scutellum angulated and 

 walls or interspaces thin, mere septa; only rarely are punc- 

 tures round or roundish and interspaces thickened or wid- 

 ened; anterior margin of first tergite generally not completely 

 masking posterior aspect of neck of propodeum, as a rule 

 truncate or only slightly convex; head or thorax or both 



head and thorax sometimes black {chrysopae group) 12 



Cheeks not convexly rounded but straight or nearly straight; 

 head in front view usually elongate or somewhat transverse 

 and as a rule subtriangular; eyes not reaching level of base of 

 clypeus (not always so definite in males) ; umbilicate punc- 

 tures on mesoscutum and scutellum round or roundish and 

 interspaces more or less widened, at least medially; anterior 

 margin of first tergite strongly elevated and completely 

 masking posterior aspect of neck of propodeum, strongly or 

 acutely convex; neither head nor thorax completely black 

 (anomocerus group) 14 



12. Upper part of frons between eye and scrobal cavity usually ver- 



tically wrinkled or rugose, in males this sometimes extended 

 to level of base of antennae; malar furrow half or less than 

 half as long as width of cheek at apex; pronotum laterally as 

 a rule very distinctly shorter than dorsal margin of prepectus; 

 head very rarely completely black, usually more or less green, 

 blue, bronzy, cupreous, or brown chrysopae Crawford 



• Sometimes, as in anomocerus Crawford, extending and resting on neck of propodeum and appearing to 

 form a petiolelike tergite. 



