HORSEFLIES OF THE SUBFAMILY TABANINAE 145 
Dorsum of thorax subshiny, black, with indistinct grayish stripes in usual 
pattern; prescutal lobe orange. Pleura, sternum, and coxae with thin grayish 
pollen and mostly whitish hair. Wing hyaline, the costal cell and base of 
wing yellowish brown; venation normal. Legs orange brown, the bases of 
femora and the tarsi somewhat darker; hind tibial fringe stout, black. 
Abdomen blackish, subshiny, the posterior margins of the segments with 
narrow light-yellowish-brown bands of pollen and pile and the dorsum more 
or less extensively dull reddish on sides of first three tergites, this sometimes 
very faint; venter occasionally reddish. 
Male.—EKye pilose, the facets nearly uniform in size; subcallus somewhat 
protuberant, pollinose gray; pollen of clypeus and genae tinged with yellow, 
the middle of clypeus not denuded; palpus very small, the two segments 
subequal and second segment flattened above, convex below; proboscis reach- 
ing beyond end of fore coxa. Body coloration essentially as in female, the 
prescutal lobe and legs somewhat darker. 
Described from a male in the collection of the Boston Society 
of Natural History from Nantucket, Mass., June 8, collected by 
C. W. Johnson. 
Type.—Female, in the collection of the University of Minnesota. 
Type locality—McGregor, Minn. 
Distribution—Minnesota to Newfoundland and Massachusetts. 
June 8 (Nantucket, Mass.) to July 15 (Little River, Codroy, New- 
foundland). In the United States National Museum, one female. 
This species resembles Z’abanus seufasciatus to a considerable ex- 
tent, but the denuded subcallus of the female and the very small 
palpus of the male will serve to distinguish longiglossus. 
TABANUS MINUSCULUS Hine 
(Fig. 70, A) 
Tabanus minusculus Hine, Ohio Nat. 8: 226-227, 1907; McDunnough, Canad. 
Wnt. 58; 142, 1921; Stone, Ann. Ent. Soc. Amer. 28: 297-298, 1930. 
Small; three rows of pale triangles on abdomen and side suffused with 
orange brown; subcallus pollinose; palpus very slender; third antennal seg- 
ment searcely excised above. 
FIGuRE 70.—Antenna, front view of head, and palpus of (A) Yabanus minusculus, (B) 
T. hearlei, and (C) T. astutus. 
Female.—Length 10-12 mm. Eye pilose, with three purple bands. Frons 
gray or brownish, about three times as high as width at base, tending to be 
slightly wider at middle than above or below; basal callus dark brown to 
black, somewhat convex, square or slightly wider than high, usually broadly 
joined to median callus, which tapers to a thin line reaching to the yellowish, 
well-defined, oval, ocellar tubercle; often a pair of thin, outwardly curved, 
denuded, dark lines running from upper outer corners of basal callus to ocellar 
tubercle; subcallus yellowish brown covered with gray pollen. Antenna orange, 
the annulate portion darker; first two segments gray, with black hair; basal 
portion of third with scarcely any dorsal prominence and no dorsal excision ; 
annulate portion rather stout, about equal to basal portion in length. Clypeus 
and genae yellowish gray, with white hair except on upper genae, which bear 
sparse black hair. Second palpal segment dark yellowish brown, elongate, very 
slender, tapering and only slightly curved at base, with black hair. 
Mesoscutum black, with yellowish-brown pollen on three slender dorsal lines 
and a broader lateral stripe starting on humeral lobe and reaching back to 
postalar lobes, leaving a dark longitudinal streak above wing base; prescutal 
38521°—38——10 
