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 small hyaline spot, and the 
hyaline 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- 
siderably larger than the average eastern specimens. The 
prominent apical spot united with the cross-band, together with 
the prominent yellow 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 distinctly 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 svn- 
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 
