HORSEFLIES OF THE SUBFAMILY TABANINAE 135 
tion not margined with brown. Abdomen usually with as much orange, but 
the short hair on the entire venter black, with very little yellowish hair. 
Male.—Coloration essentially as in female. 
Type.—One of four female cotypes, Museum of Comparative 
Zoology No. 14520, labelled and herein designated as lectotype. 
Type locality—Webber Lake, Calif. 
IMNstribution—Oregon and Idaho to central California and Utah. 
June 22 (Bridgeport, Calif.) to September 19 (Kosmo, Utah). In 
the United States National Museum, 106 females, 32 males. 
The characters utilized by Rowe and Knowlton will not serve to 
separate the types of Zabanus sonomensis and T. phaenops, and 
nearly all of the specimens from Utah which they studied are true 
sonomensis. It may be that these two forms are specifically distinct 
but they agree so closely in structure that the writer prefers to con- 
sider them as varieties of the species. 
Hine examined the type of Zabanus maculifer Bigot and deter- 
mined it as phaenops Osten Sacken. This species is extremely abun- 
dant in the West and is one of the more serious pests of livestock. 
Webb and Wells reared and collected a number of specimens of variety 
phaenops at Topaz, Calif. 
TABANUS DAECKEI Hine 
(Fig. 64, B) 
Tabanus daeckei Hine, Ohio Jour. Sci. 17: 269-270, 1917. 
Rather small; abdomen with orange sides and a faint, continuous, yellowish- 
brown, median stripe on the black median portion; subcallus pollinose; antenna 
mostly black. (Atlantic coast.) 
Female.—Length 12-13 mm. Eye greenish blue, with three diagonal bronzy 
bands and short brownish pile. Frons about three and one-half times as high 
as width at base, widened above, with orange pollen and black hair; basal 
callus black, convex, square or slightly wider than high; median callus spindle- 
shaped, not well defined, nearly or quite separated from basal callus; ocellar 
tubercle dark brownish to black, not well defined; subcallus, clypeus, and 
genae yellowish gray. First two antennal segments yellowish brown, with 
black hair, the dorsal process of second prominent; third orange brown at 
base, black beyond dorsal angle; basal portion rather short and stout, scarcely 
excised above; annulate portion as long as basal portion, rather stout. Second 
palpal segment pale yellowish, somewhat swollen at base, and tapering to a 
point, with black and yellowish hair. 
Thorax nearly black, with yellowish and black hair; prescutal lobe orange 
brown. Wing pale brownish, without any spotting; venation normal. Coxae 
and bases of femora dark, with grayish pollen; apices of femora and the tibiae 
orange brown, the apex of fore tibia dark; tarsi darker brown; hind tibial 
fringe long and black. 
Abdomen above orange brown, with a black median stripe starting on first 
tergite the width of scutellum, narrowing on second, widening on third and 
fourth, the fifth to seventh entirely black; on black stripe a row of faint, 
elongate, yellowish triangles forming a median stripe; all tergites with a thin 
posterior fringe of yellow hair; venter orange brown, except middle of first 
sternite and apex, which are black. 5 
Male.—Hye densely covered with long brown pile. Areas of large and small 
facets weakly differentiated near middle. Second palpal segment creamy col- 
ored, with tlack hair, moderately swollen. Coloration essentially as in female, 
but with a large black spot in middle of second sternite. — 
Type.—Female, in the collection of Ohio State University. 
Type locality —Cape May, N. J. 
Distribution—Coast from New Jersey to Virginia. May 24 (Nas- 
sau, Del.) to July 6 (Dover, Del.). In United States National 
Museum, 88 females, 11 males. 
