HORSEFLIES OF THE SUBFAMILY TABANINAE 148 
joined to median callus and often a slender black line running from ocellar 
tubercle to median callus and a pair of lines from ocellar tubercle to sides of 
frons opposite median callus; subcallus, clypeus, and genae yellow; genae with 
black hair. Antenna orange, the annulate portion dark orange to black; first 
two segments with black hair; third with a distinct angle at base and a rather 
deep excision; annulate portion shorter than basal portion. Second palpal seg- 
ment rather slender, dark yellowish brown to black. 
Thorax black, with black and some yellowish-brown hair; prescutal lobe 
reddish. Wing hyaline, the costal cell strongly yellowish brown and all veins 
faintly margined with same color; Sometimes a short stump from vein Rs. 
Coxae, femora, except extreme apex of middle and hind femora, apex of fore 
tibia, and fore tarsus black, the rest yellow; hind tibial fringe prominent, 
entirely yellow. 
Abdomen black, with broad bands of bright-yellow pollen on hind margins of 
tergites, and hair above and below; on second and third tergites these bands 
sharply narrowed on median third, resulting in short, anterior-projecting angles 
on each side. 
Male.—Coloration as in female, the abdominal bands slightly narrower. 
Facets of upper part of eye only slightly larger than lower ones, the line 
of differentiation scarcely visible. 
Type.—Sex and collection unknown. 
Type locality—Latitude 65°, Canada. 
Distribution—British Columbia and Northwest Territory to New- 
foundland and south to Washington, Michigan, and New Jersey. 
May 21 (Springfield, Mass.) to August 24 (St. Johns, Newfound- 
Jand). In the United States National Museum, 15 females, 2 males. 
The type locality of favocinctus is Mexico, but Osten Sacken saw 
the type and declared it to be zonalis, and the writer agrees with him 
in considering the locality label to be probably erroneous. 
TABANUS AEQUETINCTUS Becker 
(Fig. 69, 4) 
Tabanus flavipes Wiedemann, Aussereuropaische zweiflitigelige Insekten, v. 1, 
pp. 187-1388, 1828; Osten Sacken, Mem. Boston Soc. Nat. Hist. 2 (pt. 4, 
No. 4) : 462-463, 1876; Brauer, Denkschr. K. Akad. Wiss. Wien 42: 141-142, 
1880; Graenicher, Wis. Nat. Hist. Soc. Bull. (n. s.) 10: 174, 1913; Kroéber, 
in Lindner, Die Fliegen der Palaearktischen Region, Lfg. 6, p. 64, 1925. 
(Preocecupied by Tabanus flavipes Gravenhorst.) 
Tabanus aequetinctus Becker, Act. Soc. Sci. Fennicae 26 (9): 8-9, 1900. 
Tabanus nigrotuberculatus Fairchild, Boston Soc. Nat. Hist. Occas. Papers 8: 
189, 1984. (New synonymy.) 
Medium sized, stout; blackish, with bands of pale-yellow hair on abdomen ; 
prescutal lobe black; hind tibia yellow. 
Female.—Length 15-18 mm. Eye deep purple, with four diagonal green-blue 
bands and dense, short, brown pile. Frons about three times as high as width 
at base, decidedly widened above, yellowish gray, with black hair; ocellar 
tubercle usually not sharply defined, reddish, surrounded by a black denuded 
area; basal calluS convex, square or slightly wider than high, with a small, 
linear, median callus attached above, surrounded by a darked area; subcallus 
usually denuded, shiny reddish black, the semicircle immediately above antennal 
pits with yellow pollen. Antenna dark reddish, paler on base of third segment ; 
first two segments with black hair; basal portion of third stout, the dorsal angle 
near base, prominent, dorsal excision pronounced, and ventral surface rather 
distinctly angulate. Clypeus and genae dark gray, with yellowish or grayish 
hair. Second palpal segment slender, dark brown to black, with black hair. 
Thorax, including prescutal lobe, black, with black hair; some yellowish hair 
on pleura. Wing hyaline, the costal cell, veins, and vein margins of fore part 
of wing brown; venation normal, rarely a stump vein from vein Rs. Legs orange 
and black, the orange on base of fore tibia, apex of middle and hind femora, and 
middle and hind tibiae and tarsi; hair concolorous with part of leg from which 
it arises; hind tibial fringe prominent, entirely orange. 
