of the Family Tabanide. 307 
has not yet been found in N. America, this is hardly to be 
accepted as a proof of its occurrence, but is probably a 
mistake. Hight more specimens were also labelled C. sepu/- 
chralis, Fabr., but all belonged to other species. 
Chrysops pertinax, ? , Williston, Trans. Kans. Acad. x. p. 132 
(1887). 
Chrysops nigriventris, 2, Bigot, Mém. Soc. Zool. Fr. y. p. 604 (1892), 
On comparing Bigot’s type from Washington Territory 
with Williston’s description of C. pertinax, I have no doubt 
that it is only a specimen of Williston’s species ; the only 
difference is in the wings, the fifth longitudinal vein being 
slightly shaded along its length in Bigot’s type, which comes 
from the same locality as C. pertinax. There are six female 
specimens besides the type. 
Chrysops coloradensis, ?, Bigot, Mém. Soc. Zool. Fr. v. 
p- 605 (1892). 
A mixed species; the male type and four other specimens 
and three females belong to C. fulvaster, O. 8. 
The female type and one other specimen seem to be 
referable to a distinct species and are easily distinguished 
from C. fulvaster by the non-incrassated antenne and the 
different pattern of the wings; they both come from 
Colorado. 
I append a redescription of the type, which may be of use 
in identifying the species :— 
Yellow. Abdomen with black spots; the second basal 
cell of wing shghtly infuscated. 
Face yellow, only the pits of the callosities being black, 
and a small black spot on the outer margin of each cheek. 
Palpi yellow. Antenne black; the first two joints yellow, 
with black pubescence. Frontal tubercle yellow, with a black 
border ; forehead yellowish, with yellowish pile and pubes- 
cence, the ocellar tubercle black. Thorax black, with four 
greyish-yellow stripes and yellow pubescence; the sides and 
breast with greyish tomentum and a black stripe on the latter. 
Abdomen yellow, with an oblong black spot on the first seg- 
ment, slightly concave on its posterior border; two black pear- 
like spots on the second segment, converging on the anterior 
border, but not joined; on the third and fourth segments 
there are four black spots, divided up by the yellow colour ; 
on the last three segments they coalesce into black bands 
with vellow posterior borders; on the other specimen there 
