306 Miss G. Ricardo on the Pangonine 
Chrysops fulvaster, § 2, Osten Sacken, Western Diptera, 
p. 221 (1877); id. Cat. (1878); Williston, ‘Trans. 
Kansas Acad. x. pp. 182, 184 (1887). 
Chrysops coloradensis, § 9, Bigot, Mém. Soe. Zool. Fr. v. p. 605 (1892). 
One female from Wet Mountain Valley, Colorado, 99. 522 
(Cockerell). 
The male type of C. coloradensis, Bigot, is a specimen of 
the above species, to which apparently C. crassicornis, v. der 
Wulp, is very nearly allied, if not the same, judging from the 
description of the latter. 
Chrysops proclivis, 9 , Osten Sacken, Western Diptera, p. 222 
(1877) ; id. Cat. (1878) ; Williston, Trans. Kans. Acad. 
x. pp. 182, 184 (1887). 
Chrysops atricornis, $ 2, Bigot, Mém. Soc. Zool. Fr. vy. p. 603 (1892). 
The female type of Bigot’s C. atricornis from Colorado 
answers exactly to Osten Sacken’s description of his C. pro- 
clivis. The male type differs in the following particulars :— 
The face is yellow, only the pits of the callosities being black 
and clothed with long black hairs. The abdomen has the 
yellow on the first two segments less extended, the black spots 
being wider; the black dot on the sides of the second segment 
in the female is not present here, the yellow triangle inter- 
secting the black spot on the second segment is reduced to 
a yellow margin; the black band on the third segment is 
continuous, not reaching the sides, with indentations of yellow 
on the posterior border. The fore legs are yellower, the 
apical half of the femora being yellow. The wings have the 
dark colouring extended into the second basal cell at its base 
and along its posterior margin, continuing the whole length 
of the fifth longitudinal vein. 
Chrysops sequax, @, Williston, Trans. Kans. Acad. x. p. 1382 
(1885). 
? One female from Georgia. 
This was wrongly labelled fascipennis, var., Macq. I be- 
lieve it to be a specimen of C. seguax ; but the face does not 
altogether agree with Williston’s description, bemg yellow, 
the callosities with only a brownish tinge, and the frontal 
callosity decidedly yellow, posteriorly with a black border ; 
otherwise it agrees. 
Mixed w ith some specimens labelled C. sepulehr alis, Fabr., 
was one numbered 68. 4 among the N.-American species, 
Hudson’s Bay being given on the label ; but as this specics 
