Dec, 1904.] Tabanidae. 223 



middle, a row of narrow spots on each side, and apical segments 

 black, remainder yellow. 



Male: Colored like the female except more black on legs and 

 wings. In the latter the apical triangle is the same in both sexes, 

 but in each basal cell there is only a smalbhyaline spot, and the 

 hvaline in the anal cell is much reduced. Length of both sexes 

 8 millimeters. 



A male and female in the Bolter Collection at the University 

 of Illinois, and through the kindness of Dr. Forbes and Prof. 

 Hart, I have been permitted to study them. Taken at Las 

 Vegas, New Mexico. 



Separated from related species by the black frontal callosity 

 of the female and the black facial callosities of both sexes. 



Chrysops frigidus Osten Sacken. Variable in size and colora- 

 tion of the abdomen. Some of the western specimens are con- 

 siderablv larger than the average eastern specimens. The 

 prominent apical spot united with the cross-band, together with 

 the prominent vellow on the sides of the abdomen and the black 

 ground color of the middle of the face, makes this species one of 

 the easiest to recognize. 



Chrysops fulvaster Osten Sacken. The first antennal segment 

 is distinctlv swollen. The dark of the wings is brownish and 

 there is often a hyaline spot in distal cell of the wing of the 

 female, but I have not observed it in the male. The wings are 

 brownish along the whole posterior marign and the hyaline tri- 

 angle is represented by a crescent-shaped sub-hyaline space in 

 both sexes. A most abundant species over a number of western 

 states. 



Chrysops furcatus Walker. This species was placed as a syn- 

 onym of striatus by Osten Sacken, but Miss Ricardo who recently 

 studied the type in the British Museum, states that it is not 

 identical with striatus and then points out differences. Previous 

 to the past summer I had not recognized the species, but it was 

 included among a number of specimens received from Mr. Jos. 

 C. Ouellet of Montreal. Two specimens which agree with Walk- 

 er's description and Miss Gertrude Ricardo's additional remarks, 

 were taken at Val Morin a few miles north of Montreal. The 

 wing is colored like that of coloradensis, the frontal callosity is 

 pure black, and the face and cheeks are yellow with the exception 

 of a black indented spot immediately below each facial callosity. 

 The black spot on the second abdominal segment is deeply emar- 

 ginate posteriorly and black on the third and fourth segments is 

 in the form of four black spots on each, remaining segments black 

 with a yellow hind border. The species is separated from lupus 

 and proclivis by the wholly yellow cheeks. It does not come 

 within the scope of this paper rightly, but since it has not been 



