144. MISC. PUBLICATION 305, U. 8S. DEPT. OF AGRICULTURE 
Abdomen black, the hind margins of segments on both dorsum and venter 
narrowly yellow, with yellow hair which is scattered over the black to some 
extent; often a reddish spot on side of second tergite; no indication of pale 
triangles. 
Male.—Osten Sacken described what he took to be the male but the writer 
has not seen the specimen. He wrote, “The sides of the second abdominal 
segment are reddish. The head is moderately large, and the difference between 
the large and small facets well marked, although not very considerable.” 
Types.—Three female cotypes in the Helsingfors Museum and the 
Becker collection. 
Type locality —Plakina and Kureika, northwestern Siberia. 
Distribution—Western Siberia and North America from Wis- 
consin to Labrador. June 12 (Hopedale, Labrador) to September 5 
(Kangalasiorvik Bay, Labrador). In the United States National 
Museum, 37 females. 
This species has commonly been called Zabanus flavipes Wiedemann, 
both in this country and in Europe, but Fairchild pointed out the 
FIGuRE 69.—Antenna, front view of head, and palpus of (A) TYabanus aequetinctus and 
(B) T. longiglossus. 
previous use of the name by Gravenhorst and proposed the name 
nigrotuberculatus. Krober, however, had previously placed 7’. 
aequetinctus Becker as a synonym of 7’. flavipes Wiedemann, and since 
there appears no reason to doubt the synonymy, Becker’s name should 
be used. It is strange that this species has not been collected in 
Alaska. 
TABANUS LONGIGLOSSUS Philip 
(Fig. 69, B) 
Tabanus longiglossus Philip, Minn. Agr. Expt. Sta. Tech. Bull. 80: 110-111, 1931; 
Fairchild, Boston Soe. Nat. Hist. Occas. Papers 8: 148, 1934. 
Rather small, stout; abdomen mostly black, with some dull reddish laterally ; 
eye pilose; subeallus denuded; palpus very slender. 
Female.—Length 12-14 mm. Eye densely pilose, purple, with four green 
stripes, the upper one widest. Frons two and one-half to three times as high 
as width at base, slightly widened above; pollen of entire head grayish; basal 
callus dark brown, transverse, with narrow extensions upward along margin of 
eye; median callus narrow, irregular, not joined to basal callus but with a 
narrow extension to ocellar tubercle and with an irregular denuded area to 
each side extending to eye; ocellar tubercle prominent, orange brown, sur- 
rounded by an extensive, black, denuded area; subcallus blackish brown, de- 
nuded except for a pollinose band surrounding antennal pits. First two 
antennal segments orange brown, with gray pollen and black hair; second with 
distinct dorsal process; third dull orange brown, the annulate portion some- 
what darkened; basal portion stout, about length of annulate portion, with the 
dorsal angle very obtuse and with no dorsal excision; annulate portion 
stout, the annuli distinct. Clypeus and genae black, with thin gray pollen 
and whitish hair, the middle of clypeus usually denuded. Palpus with first 
segment blackish brown, second yellow brown, the latter extremely slender, 
with a mixture of short black and yellowish hair. Proboscis elongate, the 
tip of palpus just reaching to base of elongate labellae. 
