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U. S. NATIONAL MUSEUM BULLETIN 216 



usually, usually lower half and often more of mesopleurum, sometimes 

 metapleurum more or less, and rarely more or less of mesoscutum 

 fulvous or fulvoferruginous; front and middle femora pale fulvous, 

 whitish on apex and in front; middle tarsus white, the apical half of 

 fifth segment and extreme apex of first to fourth segments infuscate; 

 hind coxa fulvous, its extreme apex whitish; hind femur fulvous, white 

 on apex and with a preapical infuscate band; hind tibia white, its sub- 

 basal 0.15 ± and apical 0.28 ± fuscous; hind tarsus white, the first to 

 fifth segments with their apical 0.4 ±, 0.5 ±, 0.5 ±, 0.5 ±, and 0.7 ± 

 respectively, fuscous. 



Figure 73.— Localities for 

 Tromatobia ovivora ovivora 



Female: Colored like the male except as follows: face black, 

 usually with a narrow white mark laterally and a transverse white 

 spot below each antennal socket; white mark on frontal orbit nar- 

 rower; clypeus sometimes entirely white but usually white with the 

 central part brown or black, sometimes entirely blackish; mandible 

 usually white at base but sometimes entirely black; palpi white to 

 tan; lower side of scape light brown to black, of pedicel whitish or 

 stramineous; under side of nagellum pale brown, the rest darker; upper 

 margin of pronotum sometimes entirely white but usually white only 

 posteriorly; front and middle legs more or less suffused with fulvous, 

 usually only their trochanters being entirely whitish. 



This subspecies is quite variable in the Nearctic region, and the 

 varieties have some geographic restriction. We have not, however, 

 been able to segregate them as separate subspecies. Specimens from 

 the North tend to resemble specimens from Europe very closely. 

 These are relatively small, narrow in build, with the white lateral mark 

 on face restricted or absent, clypeus dark with a lateral white area, 

 fulvous areas on thorax restricted, and fuscous bands on hind tibia 

 both broad and sharply defined. In the Western States the species 

 tends to be more robust, with more extensive fulvous areas on thorax, 



