250 THOMAS SAY FOUNDATION 



the front is noticeably flat and quite prominent, ocel- 

 lars large; frontal bristles 8, not divergent below, 

 reaching to the middle of the second antennal joint; 

 outer verticals absent; antennae reddish brown, third 

 joint somewhat darker and 2% times as long as the 

 second, reaching five-sixths of the way to the vibrissa, 

 which are just above the oral margin; palpi and pro- 

 boscis black, ordinary; bucca nearly half the eye- 

 height, with rather small black hairs; back of head 

 with three rows of black hairs and rather abundant 

 whitish ones in the middle and below, which do not 

 extend in front of the metacephalic suture. 



Thorax yellowish cinereous, the stripes faintly 

 marked ; ps dc four ; ant acr well developed ; prsc one ; 

 stpl three; scutellum with two large marginals, one 

 smaller preapical and no apicals; the second pair of 

 marginals are a little closer together than in many 

 species. 



Abdomen densely cinereous pollinose with yel- 

 lowish tinge, tessellated, with indistinct median black 

 stripe; the first and second segments have only lat' 

 erals; the fourth has a marginal row of about 12; 

 fifth sternite black, with short black brushes very dis- 

 tinct, the remainder of the sternite not visible. 



Hypopygium rather large; first segment black, 

 pollinose, reddish on the lower angles, with a row of 

 stout black bristles behind; second segment red (rare- 

 ly almost black) subshining, with a few scattered 

 small bristles; forceps red, the tips black, widely 

 divergent, rather straight and evenly tapering, not 

 very long; posterior claspers strongly hooked, brown, 

 slender, with two or three teeth just before the hook; 

 anterior claspers long, reddish brown, slender, not 

 hooked; accessory plate minute, reddish; penis one- 

 jointed, reddish brown in color, slender and simple al- 

 most to the tip ; in profile the back edge extends for- 

 ward at the apex into a blunt lobe, in front of which 

 there is a second lobe not quite so much produced; 

 in front of this and somewhat toward the base is at- 

 tached an irregular transverse plate, the sides of 



