44 C. H. TYLER TOWNSEND. 



expanded before and hehiud. Therefore, the second segment is yellow, except 

 this black inverted T-marking; fourth segment greenish black, with yellowish 

 pubescence, fifth black ; pile of black portions of second segment black, also of 

 yellow portion for a space in front of the black on each side ; of rest of yellow 

 portion yellow ; pile of yellow portions of third segment almost wholly yellow ; 

 of black pm-tions black, except laterally, where it is also yellow. Venter of 

 second segment almost wholly light yellow, rufous on the median line connecting 

 with the rufous, which occujiies all of third segment. Legs same, but middle 

 tibite more yellow, and for more than basal half, and basal joints of tarsi reddish 

 brown. Wings same ; second vein irregular, /. e., sinuous. Length hardly 10 mm., 

 not including antennae. 



Fort Collins, Colorado (Gillette). One female. 



This species may be difFerentiated at once from V. mtur O. S., 

 which it approaches, by the presence of the median black stripe of 

 face and the wholly dark fourth abdominal segment. The arista in 

 both this species and V. fax is long and thickly plumose above, ex- 

 ceeding in length the elongate third antennal joint. 



:i6. Voliicella i<!iabcllina Williston. 



Las Cruces, X. Mex., July 12. One female, agreeing well with 

 descriptions. The abdomen is reddish discolored, instead of pale 

 yellowish. 



37. Volueella Iiieaiia Towns. 



El Torte, Baja Cal. ( Cal. Acad. Sci.). One female; for descrij)- 

 tion see Proc. Cal. Acad. Sci., 1894. 



38. Voliicella iiiellea Jaenn. 



Guanajuato, Mex. (A. Duges). Two specimens, S 9 . These 

 specimens agree very closely with Jaennicke's description, except as 

 follows : The pile of eyes has a blackish vertical streak in the mid- 

 dle. There is no sign whatever of the three vittie on thoracic dor- 

 sum, which is uniformly shining dark greenish ; first abdominal 

 segment does not seem to be entirely black in male, and is mostly 

 honey-yellow in female ; peculiar spots on third and fom-th segments 

 in both specimens, better shown on fourth. Wings with clouds on 

 the anterior cross-vein, termination of auxiliary, origin of third vein, 

 tip of second vein, two cross-veins at distal end of second basal cell, 

 and terminal portions of last two sections of fourth vein. Of tlie 

 most pronounced clouds in the female are those on the anterior cross- 

 vein and at tip of second vein. All three costal cells yellowish. 

 The female has a stump of vein on inside of next to last section of 

 f )urth vein, but there is no sign of such in the male. 



