134 KANSAS ACADEMY OF ISCIENCE. 



the second longitudinal vein. Legs yellow or brownish yellow, the knees, distal part 

 of front tibisB, their tarsi, and the base of hind femora, black; sometimes the base 

 of middle femora, the tip of their tibiae, and the whole hind legs, except the base of 

 the tarsi, black. 



Male: Black abdominal stripes stronger and more distinct, the median ones more 

 coalescent on the first and anterior part of second segment; the wings darker, with 

 the second basal cell almost wholly brown, the only wholly hyaline portions being at 

 the outer end of the second basal cell, encroaching upon the base of the fifth poste- 

 rior cell, and the slender crescentic spot beyond the cross-band. 



Four females and one male, Western Kansas. 



Chrysops plangens Wiedemann. 



Specimens of this species from Georgia, though smaller, agree in other respects 

 with ones from Connecticut. 



Chktsops sordidus Osten Sacken. 



Two specimens of this species from the White Mountains, while agreeing well 

 with the description, would not be correctly located in Osten Sacken's table, by reason 

 of the slight infuscation at the base of the second basal cell. 



Cheysops ouclux Whitney, Can. Entom. xi, 35. 



This species, (closely allied to C sordidus, according to the author,) I do not 

 know. 



Chrysops cursim Whitney, Can. Entom. xi, 36. 



I do not see wherein this species differs from C. ijudiciis Osten Sacken. 



Chrysops suedus Osten Sacken. 



Specimens from California agree very well with the description, but others, from 

 Washington Territory, have the yellow of the face extending to the oral margin in 

 front, and the grayish stripes of the thorax extending distinctly the whole length of 

 the dorsum. The third and following abdominal segments have a narrow posterior 

 yellow margin, and the third and fourth segments have each a median stripe. 



Chrysops peoclivus Osten Sacken. 



Specimens from California, Washington Territory, and Mt. Hood, Oregon, agree 

 very well with the description. 



Cheysops folvastee Osten Sacken. 



Numerous specimens from Colorado and Montana I identify with this species, 

 though there is some variation among them. In the Montana specimen the second 

 abdominal segment is chiefly blackish, with the posterior margin, a median expan- 

 sion, and the anterior angles yellowish. In the males the segments have each a small 

 yellow median posterior expansion. Osten Sacken omits a striking characteristic of 

 the species, viz., the thickening of the first antennal joint. Near the close of his de- 

 scription of the female, "fourth posterior" should read fifth posterior. 



Chrysops disoalis Williston, Trans. Connecticut Acad., iv, 24.5. 



Chrysops costatus Fabr. 



San Domingo. Belongs to the group with a hyaline spot in the discal cell; it has, 

 also, very slender antenna?. 



Chrysops pachy(;eea, n. sp. 



Female: Length 8, 9 mm. Facial callosities yellow (probably with blackish in 

 some specimens). Front, yellow; the callosity shining reddish yellow, somewhat 

 margined with blackish above. Antennte elongate, the first two joints together longer 



