252 THOMAS SAY FOUNDATION 



facials grayish white, the latter with the usual row 

 of small hairs; ocellars distinct; outer verticals pres- 

 ent; frontal stripe blackish, wide, slightly poUinose 

 above; frontal bristles 6 to 8, slightly diverging be- 

 low, reaching to about the middle of the second an- 

 tennal joint; antennae blackish, the third joint fully 

 twice the second, reaching three-fourths of the way 

 to the vibrissse, which are at the oral margin; arista 

 plumose on basal half; palpi and proboscis black, 

 ordinary; bucca about half the eyeheight, with black 

 hairs; back of head with three rows of black hairs, 

 the whitish hairs at the middle and below do not ex- 

 tend in front of the metacephalic suture. 



Thorax gray pollinose, with three black stripes 

 when viewed from in front; ps dc four; ant acr very 

 large; prsc one; stpl three; scutellum with two mar- 

 ginals, one large preapical and no apicals. 



Abdomen gray pollinose with three black stripes, 

 the outer ones changeable ; fifth sternite forming two 

 short ridges which bear short black brushes, the rest 

 not visible. 



Hypopygium: first segment red, pollinose, with 

 an interrupted row of stout bristles behind; second 

 segment globose, red, somewhat pollinose, with sev- 

 eral scattered bristles, of which about a half dozen 

 are large; forceps short and straight, widely diver- 

 gent, red with black tips; accessory plate yellow, 

 small, depressed; posterior clasper black, erect, 

 strongly hooked, with several teeth on the front edge ; 

 anterior clasper blackish, long, slender, straight near 

 the apex, lying close against the penis; penis with a 

 single segment, brown, polished, the middle large, 

 somewhat globose, with two terminal lobes not very 

 distinctly separated from each other; in front of the 

 globose portion arise two flattened diagonal plates 

 which are attached by their middle; one end 

 extends almost to the apices of the lobes of the penis ; 

 the other extends about an equal distance in front of 

 the organ. 



