176 



U. S. NATIONAL MUSEUM BULLETIN 216 



I. VARIABILIS GROUP 



Areolet present or absent, when present broadly sessile above; 

 carina between metapleurum and metasternum complete; propodeum 

 with a rather strong dorsolateral longitudinal ridge. 



Face and frons entirely black. 



This group includes a single Holarctic species. 



1. Tromatobia variabilis (Holmgren) 



Figures 322,a; 364 



Pimpla variabilis Holmgren, 1856, Svenska Vetensk.-Akad. Handl., ser. 3, vol. 42, 

 p. 88; o", 9. Lectotype (hereby designated): 9, from Lake Ringsjon, 

 Scania, Sweden, labeled "So.," "Hgn.," "type" (Stockholm). 



Pimpla rufovariata Cresson, 1870, Trans. Amer. Ent. Soc, vol. 3, p. 149; ?. 

 Lectotype: 9, Pennsylvania (Philadelphia). 



Polysphincta cingulata Provancher, 1875. Naturaliste Canadien, vol. 3, p. 141; 

 9. Type: 9, Quebec (Quebec). 



Polysphincta forsiusi Hellen, 1915, Acta Soc. Fauna Flora Fennica, vol. 40, p. 45; 

 d", 9- New synonymy. Types: d\ 9, Perna, Tammerfors, and Saraisniemi, 

 Finland (Helsinki). 



Front wing of male 4.2 to 5.5 mm. long, of female 3.7 to 5.5 mm. 

 long; areolet present or absent; ovipositor sheath about 0.43 as long 

 as front wing. A stout-bodied species. 



Black. Clypeus of male pale yellow, of female brown or black; 

 palpi of male ivory, of female pale stramineous; flagellum brown, 

 paler below; hind corner of pronotum often whitish; mesopleurum 

 except above, mesosternum, metapleurum, and propodeum often 

 more or less ferruginous; tegula pale yellow to brown; front and middle 

 legs of male fulvous, their trochanters, coxae apically, and tinges on 

 knees and front of front femur and tibia pale yellow, their coxae 

 often fuscous basally; front and middle legs of female fulvous, their 

 coxae often more or less fuscous and their trochanters sometimes 



Figure 72. — Localities for 

 Tromatobia variabilis 



