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 ; vibrissse 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 vibrissee. 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 

 plate 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 



