26 MISC. PUBLICATION 305, U. 8S. DEPT. OF AGRICULTURE 
LEUCOTABANUS AMBIGUUS, new species 
(Fig. 8,B) 
Tabanus albiscutellatus Hine (not Macquart) (in part), Mich. Univ. Mus. Zool. 
Occas. Papers 162: 34, 1925. 
Medium sized; reddish brown, with mostly white hair; antenna black; wing 
hyaline; abdomen with broad white bands, femora black; tibiae mostly white. 
Female.—Length 16mm. Eye with sparse, short pile. Frons yellowish gray, 
slightly over five times as high as wide, with nearly parallel sides; basal and 
median calli forming a narrow brown line, tapering above and reaching from 
subeallus three-fourths of distance to the distinct, dark-brown, ocellar tubercle; 
subeallus concolorous with frons, slightly protuberant. Antenna black; first 
segment not greatly enlarged; second with strong dorsal process; both with 
black hair; third with basal portion considerably shorter than the long, slender, 
annulate portion, the dorsal angle strong and excision moderate. Clypeus and 
genae gray except for brown at upper margin, with white hair. Second palpal 
segment yellowish brown, with a frosted appearance and black and white hair, 
rather broad at base and tapering apically. 
Mesoscutum reddish brown, with thin gray pollen and white hair; four paler 
stripes evident, at least anteriorly; humerus, prescutal lobe, and apex of scutel- 
lum somewhat paler. Pleura, sternum, and coxae gray, tinged with reddish 
above, with pale hair. Wing hyaline, veins mostly dark brown; venation nor- 
mal. Femora, tibiae apically, and tarsi black; basal two-thirds of fore tibia 
and somewhat more of other tibiae white. 
Abdomen above dark reddish brown, with posterior margin of second tergite 
and most of fourth tergite white haired; third tergite with a little white hair 
posteriorly; venter dark brown, the second and fourth sternites each with a 
pale band on hind margin. 
Male—kEye bare, the areas of large and small facets strongly differentiated, 
the former extensive, and top of head distinctly flattened. Second palpal seg- 
ment stout, creamy white, with long white hair. Thorax densely white haired, 
especially posteriorly and below. Abdomen reddish brown, darker apically, the 
second tergite entirely white, third and fourth with broad white bands on hind 
margins; ventral bands not quite so wide. : 
Type.—Female, in the Museum of Comparative Zoology. Para- 
types, two males in the same collection, one female and two males in 
the collection of Ohio State University, and one female and one male 
in the United States National Museum (No. 51958). 
Type locality—Palmerlee, Ariz. 
Type collected July and two paratypes, same data; other paratypes 
from Hereford, Ariz. (H. Hereford) ; Garces, Ariz.; Carr Canyon, 
Huachuca Mts., Ariz., August 1905 (H. Skinner); Santa Rita Moun- 
tains, Ariz., July (F. H. Snow) ; Arizona. 
Under the name Tabanus albiscutellatus Macquart, Hine described 
two females from Guatemala and one male and one female from 
Arizona. The two females from Guatemala represent one species, 
the pair from Arizona another, and neither is a/biscutellatus Mac- 
quart if, as seems probable, Kréber (7/7) is correct in placing albis- 
cutellatus as a synonym of leucaspis Wiedemann; nor does either 
of the species misidentified by Hine agree perfectly with Walker’s 
description, or with Kroéber’s redescription, of 7. wnzcinctus, a syn- 
onymy suggested by Kréber (77). The Arizona species is here de- 
scribed as new, and the Guatemala species left unnamed for the 
present. 
