220 The Ohio Naturalist. [Vol. V, No. 2, 



I'J. The facial callosity on either side inside of the suture yellow, 

 making the yellow stripe on the middle of the face appear 

 wide proclivis 



The facial callosities on either side entirely black, making the yel- 

 low stripe on the middle of the face appear narrow surdns 



Chrysops carbonarius Walker. The synonymy given in the 

 list has been worked out mainly by Osten Sacken and Miss 

 Ricardo. The speci^es has a wide distributioft and the uniformly 

 black abdomen, light colored hairs on the sides of the thorax and 

 hyaline spot at the base of the fifth posterior cell of the wing, 

 serve to separate both sexes from related species. 



Chrysops ceras Townsend. The near relatives of this species 

 are to be found in Mexico. Townsend pointed out the differ- 

 ences separating ceras from tany ceras O. S. and megaceras Bell, 

 when he described it. I have not the proper material to offer 

 any suggestions upon what Townsend published. The peculiar 

 structure of the antennae referred to in the key separates it frcm 

 all described species of the United States and Canada. The 

 whole bodv is brown with dark posterior margins to the abdom- 

 inal segments. The dark color of the wings is confined to the 

 costal -margin and distal half; the cross-band includes dark col- 

 oration in the region of the stigma, at the bases of the fir^t sub- 

 marginal and first posterior cells, and conspicuous margins to the 

 cross-veins and their intersections with the longitudinal veins. 

 The apical spot is separated from the cross-band, and is mostly 

 confined to the apexes of the marginal and first submarginal cells, 

 although a trace extends into the second submarginal. The f\tr- 

 cation of the third vein is prominently margined with dark brown. 



Chrysops coloradensis Bigot. The cheeks are yellow^ with the 

 exception of a small brown spot near the eye, the frontal callosity 

 is yellow with a narrow brown margin, the general color of the 

 bodv is lighter than in proclivis, there are usually two spots on 

 the second abdominal segment instead of a single geminate one ; 

 also the black on the third and fourth abdominal segments is 

 somewhat reduced in extent and exists in the form of spots. 



Chrysops coquillettii n. sp. Female 9 millimeters, some spec- 

 imens slightlv smaller. Facial and frontal callosities yellcw, the 

 latter with a dark margin, anterior part of cheeks a median line 

 on face, and front exclusive of callosity, covered with bright yel- 

 low pollen and grayish hairs; palpi yellow, antenna, first segment 

 distinctly swollen, first two segments brown with black hairs, 

 third segment much longer than the second ; basal annulus dark 

 brown, remainder black. Thorax with the usual stripes which 

 are somewhat obscured by thick grayish hairs ; legs yellow with 

 black at the joints and on apical part of anterior tibiae, all of 

 anterior tarsi and last three or four segments of other tarsi. Wing 

 with costal margin and cross-band black, apical spot fills out the 



