HORSEFLIES OF THE SUBFAMILY TABANINAE 101 
slightly narrowed at margin. Legs reddish brown to black, the tibiae usually 
Somewhat paler and often with considerable white hair at base. 
Ground color of abdomen concolorous with that of thorax; segments 2-7 
above and below with rather broad, gray, posterior bands which widen laterally 
and also middorsally above, where they form broad, quite prominent triangles ; 
a Similarly colored spot on middle of first tergite. 
Male.—Head large, the areas of large and small facets of eye strongly and 
sharply differentiated, the latter extending as a narrow band along margin 
of eye to vertex; in dried specimens the large facets are brown or yellowish, 
with a broad, dark band across middle. Subcallus protuberant, denuded, shiny 
brown. Whole body dark brown, with dark hair, the gray stripes of mesonotum 
not so distinct and abdominal bands narrower, with median triangles much 
smaller than in female. Costal cell of wing slightly infuscated. Legs entirely 
black or dark brown, with no white hair. Venter of abdomen with narrow 
posterior bands. 
Type.—Male, collection unknown. 
Type locality.—Philadelphia. 
Distribution —Colorado to Massachusetts and south to Louisiana 
and Florida. May 2 (Ware County, Ga.) to September 6 (Province- 
ee Mass.). In United States National Museum, 44 females, 5 
males. 
As Osten Sacken has pointed out, Zabanus nigripes Wiedemann, 
described from a male, might be the same as coffeatus. However, the 
size is too great, and, until the type can be studied, it seems better 
not to revert to the older name. 
TABANUS RUFOFRATER Walker 
(Fig. 45, B) 
? Tabanus unicolor Macquart, Dipteéres exotiques nouveaux ou peu connus, sup. 
2, pp. 38-89, 1847. (Preoccupied by Tabanus unicolor Wiedemann. ) 
Tabanus rufofrater Walker, Insecta Saundersiana, Diptera, v. 1, p. 26, 1850. 
? Tabanus lateritius Rondani, Arch. Zool. Anat. e Fisiol. 3: 80, 1864. 
Tabanus tener Osten Sacken, Mem. Boston Soc. Nat. Hist. 2 (pt. 4, No. 4): 
440, 1876. (New synonymy.) 
Medium sized; rather slender, dusty reddish brown, with a median row of 
rather large but indistinct spots on abdomen ; wing unspotted, hyaline; fore tibia 
unicolorous. 
Female.—Length 15-19 mm. Eye bare, purple, with two diagonal green 
bands. Frons about five times as high as width at basal callus, somewhat 
widened above, grayish, tinged with reddish brown, particularly at level of 
median callus; basal callus chestnut brown, higher than wide, and usually 
touching eyes; median callus a slender connected line reaching to upper fourth 
of frons; subeallus and upper genae brown. Antenna dark orange to black, 
the first two segments with black hair; third slightly longer than broad, with 
a distinct dorsal angle and only a slight excision; annulate portion slightly 
shorter than basal portion. Clypeus and lower genae grayish, with white 
hair. Second palpal segment slender, yellowish orange, with black hair. 
Mesonotum brown, with broad, faint, gray lines in usual pattern; heavy black 
hair on prescutal lobe, white hair above wing base and on sides of scutellum. 
Pleura, sternum, and coxae gray tinged with brown, with white hair. Wing 
hyaline, with very faint brown clouds at furcation and cross veins; fore femur 
black, with black hair, middle femur orange brown, hind femur brownish, 
with dense black hair above except near apex, where hair is white; fore tibia 
dark orange to nearly black, sometimes with white hair on basal half, but the 
tibia not distinctly bicolored; middle and hind tibiae orange, the former with 
mostly white hair, the latter with mixed black and white hair, the tibial fringe 
usually mostly black; tarsi dark orange brown to black, the fore tarsus 
darkest. 
Abdomen above reddish brown, with a median row of contiguous, indistinct, 
grayish triangles and some gray at hind margin of tergites laterally; venter 
reddish gray, darker apically. 
