6 PKOCEEDINGS OF THE NATIONAL MUSEUM vol. 80 



5. Submedian cell always closely hairy, never glabrous at apex; 



apical teeth of trochanters, especially of anterior legs, very 

 weak, indistinct ; mediella not, or hardly, more than twice as 

 long as lower abscissa of basella, the latter longer than ner- 

 vellus, usually much longer; scutellum usually not distinctly 

 half the median length of propodeum ; stigma never uniformly 

 pale yellow; small, slender species that are apparently all 



gregarious parasites 



Submedian cell weakly hairy apically, usually with a distinct 

 hairless area at apex, rarely uniformly hairy, but then medi- 

 ella about three times as long as lower abscissa of basella with 

 the latter not longer than nervellus, and the apical teeth of 

 trochanters distinct, or the stigma uniformly pale yellow ; 

 scutellum usually more than half the median length of pro- 

 podeum ; apparently aU solitary parasites 13 



6. Head entirely black ; face broader, usually much broader, than 



long to base of clypeus; ocell-ocular line twice as long as 

 diameter of a lateral ocellus; thorax varying from entirely 

 black to entirely yellow, but usually at least pronotum more or 



less dusky or blackish 7 



Head varying from yellow to mostly black, the face never en- 

 tirely black, at most reddish brown, blackish above and 

 medially, and then face not distinctly broader than long to 

 base of clypeus and ocell-ocular line distinctly less than 

 twice the diameter of a lateral ocellus; at least pronotum 

 and venter of thorax pale, even in the darkest specimens 12 



7. Metapleurum completely rugulose and subopaque ; mesopleurum 



below and anteriorly as well as prepectus usually punctato- 

 rugulose; face nearly twice as broad as long to clypeus; 

 malar space about as long as clypeus ; three basal abdominal 

 tergites testaceous, thorax usually black or blackish, with 



metanotum and propodeum often ferruginous 5. terminalis (Ashmead) 



Metapleurum smooth at least basally ; basal abdominal tergites 

 usually black or blackish ; otherwise not combining all the 

 above characters 8 



8. First, second, and more or less of third abdominal tergites 



closely longitudinally aciculate; nervulus distinctly a little 

 postfurcal; stigma usually without a distinct pale spot at 



base; ovipositor sheaths at least as long as the body 9 



Only the first and second abdominal tergites sculptured and the 

 second usually smooth apically ; nervulus interstitial ; stigma 

 brown with a conspicuous yellow spot at base ; ovipositor 

 sheaths not longer than abdomen 6. longicomis Provancher 



9. Radial cell unusually short, measured on wing margin only a 



little longer than stigma and about one and one-half times as 

 long as its greatest width ; nervellus nearly as long as lower 

 abscissa of basella ; abdomen entirely black or blackish above 

 and below; posterior tibiae black except at base; all tarsi 



blackish 7. peroneae, new species 



Radial cell normal, about twice as long, measured on wing mar- 

 gin, as its greatest width ; nervellus much shorter than lower 

 abscissa of basella ; three basal abdominal sternites usually 

 pale; usually more or less of third tergite, sometimes more 

 or less of the three basal tergites, reddish yellow 10 



