194 THOMAS SAY FOUNDATION 



black at base, the third joint brownish, slender, nearly 

 three times the second, reaching three-fourths of its 

 length; the plumosity is especially erect and long 

 close to the base; vibriss^e a little above the oral mar- 

 gin and slightly approximated ; f acialia black, strong- 

 ly separated from the middle of the face, which is 

 yellow; palpi brown, inclining to yellowish at tip; 

 proboscis black, moderately short; back of head with 

 a single row of black hairs behind the eye, elsewhere 

 covered with dense, long, yellow hair which extends 

 forward on the bucca almost to the vibriss^e. Outer 

 vertical bristle absent; bucca one-third the eye height. 



Thorax with conspicuous yellowish pollen, on 

 which are three broad black stripes and two slender 

 lateral ones; ps dc two, close together, just before the 

 scutellum; ant acr none; prsc one small pair; scutel- 

 lum with two lateral bristles and stout apical pair (in 

 the described specimen one of these apical bristles is 

 not developed). 



Abdomen with light yellow, changeable pollen, 

 not very distinctly striped ; some of the pollen is rather 

 brown; first and second segments with only lateral 

 bristles ; third segment with a single median marginal 

 pair and two laterals ; fourth segment with a marginal 

 row of about 12. 



Hypopygium much narrower than abdomen, 

 without any bristles, but with numerous slender erect 

 hairs. First segment dark brown, moderately long, 

 with some yellowish pollen above; second segment 

 reddish in color, inclining to brown on the sides, 

 rather globose; forceps black, long and slender, not 

 diverging at apex, with a conspicuously shining area 

 about the middle behind and with coarse black hair 

 along the sides, directed outwardly. The accessory 

 j)late black and stout, rather elongated, bearing hair 

 like the forceps; posterior claspers very slender, 

 black, nearly straight; anterior claspers broad and 

 black, slightly concave behind, strongly bent forward, 

 tapering to a moderate hook at the apex ; penis rather 

 small, reddish brown, basal joint distinct, the distal 



