222 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



cross-band from the apical portion of the wing* another subhyaline 

 elongated spot at the distal end of both basal cells. Length 6 mm . 



JIa&.— Denver, Colo., August 5 (P. R. Uhler); Utah (J.D. Putnam). 

 This seems to be £he common species in those regions. The coloring of 

 the body is variable, but the design on the wings will be easily recog- 

 nized. Five females and one male. It is not possible to identify C.ful- 

 vasler with C. quadrivittatns Say, although it is rather singular that the 

 latter should never have turned up as yet in any of the western col- 

 lections. 



3. Chrysops proclivis n. sp— Female. — Facial tubercles black on 

 the cutside of the dividing furrow only, thus leaving a broad fer- 

 ruginous interval between them ; cheeks black, shining ; the intervals 

 between cheeks, facial tubercles, eyes, rontal tubercle, and antennae 

 are filled out with stripes of pale fulvous pollen. Antennae black:, 

 underside of first joint reddish (sometimes the red is more extended). 

 Thorax black, moderately shining, clothed with yellowish pile ; a 

 stripe of gray pollen each side between the scutellum and the humerus 

 is more densely overgrown with yellow pile ; the same pile on the 

 pleurae. Abdomen black; the sides of segments 1 and 2 yellow, 

 leaving an elongated black square in the middle, slightly coarctate 

 on the hind margin of segment 1, and dovetailed on the hind margin 

 of segment 2, by the insertion of a yellow triangle; near the same 

 hind margin, on each side, there is a more or less developed black 

 dot; segment 3 is black, with a yellow hind margin and three 

 more or less distinct longitudinal lines, breaking up the black in 

 four portions; segment 4 black, with a yellowish hind margin, some- 

 times expanded into a triangle in the middle ; the following segments 

 black, with narrow yellow margins; ail the yellow portions, including 

 the hind margins, are beset with short yellow hairs. Venter likewise 

 variegated with black and yellow. Front legs black ; base of tibiae red- 

 dish : on the posterior pairs, the prevailing color is red, with more or 

 less black on the joints and at the base of the femora. Wings :— costal 

 cell and first basal cell brown, the latter with a small hyaline space at 

 the distal end crossed by a brown line ; second basal, anal cell, anal 

 angle, and fifth posterior cell hyaline ; the cross-band reaches the hind 

 margin and fills out the fourth posterior cell ; apical spot narrow, en- 

 croaching but very little on the second submarginal cell; the hyaline 

 triangle enters the marginal cell, but is separated by a brown shade from 

 the costa ; distal margin of cross-band slightly protruding toward the 

 base of the second submarginal cell. Length 8-9 mm . 



Bob. — Marin County, California. Four females. 



As usual in species of this kind of coloration, the extent of the yel- 

 low on the abdomen is somewhat variable. 





