HORSEFLIES OF THE SUBFAMILY TABANINAE 67 
annulus orange brown, the remainder blackish; first segment rather large but 
not strongly swollen above; basal portion of third with a slight obtuse angle 
above and scarcely any dorsal excision. Clypeus and genae nearly white, with 
white hair. Second palpal segment creamy yellow brown, with black hair on 
apical two-thirds, moderately long, slightly swollen basally, and tapering to a 
blunt apex. 
Mesonotum brown, with faint paler lines in usual pattern. Pleura, sternum, 
and coxae paler. Wing hyaline, with brown veins, the venation normal. Legs 
light orange brown, with pale yellowish hair, the fore femur, fore tibia apically, 
and tarsi darker; hind tibial fringe sparse, with few black hairs. 
Abdomen above orange brown, darker apically, with three rows of pale spots; 
the median spots on tergites 3-5 triangular, with somewhat concave sides and 
reaching length of tergites; sublateral oblique spots present, but faint, on 
tergites 1-6; venter orange brown, somewhat darker medianly and apically. 
Male.—Unknown. 
Type.—Kemale, in the collection of the University of Minesota. 
Paratype in the collection of the University of Minnesota. 
Type locality —lLake Minnetonka, Minn. 
Distribution.—Minnesota to New York. J uly 6 (Point Pelee, On- 
tario) to July 80 (Lake Minnetonka, Minn.). In the United States 
National Museum, two females. 
TABANUS VIVAX Osten Sacken 
(Fig. 22, A) 
Tabanus vivag Osten Sacken, Mem. Boston Soc. Nat. Hist. 2 (pt. 4, No. 4): 
446-447, 1876. , 
Tabanus arborealis Stone, Ent. Soc. Wash. Proc. 37: 14-15, 1935. (New 
synonymy.) 
Medium sized; dark brown to black, with three rows of gray triangles on 
abdomen, the median row most conspicuous, the median triangle on second 
tergite not reaching anterior margin; wing hyaline; first antennal segment not 
swollen above. 
Female.—Length 14-15 mm. Eye bare. Frons yellowish brown, with black 
hair, about three and one-half times as high as wide, the sides parallel; vertex 
flat, pollinose, with no ocellar tubercle; basal callus orange brown, rather small, 
distinctly separated from eyes, slightly higher than wide and narrowed above; 
median callus nearly black, broadly joined to basal callus and tapering to a 
point at upper third of frons; subeallus slightly swollen, yellowish brown. 
First two antennal segments dark reddish brown, with black hair; the first not 
strongly swollen above; third black, with an inconspicuous dorsal angle and 
very shallow dorsal excision, the annulate portion longer than the width, but 
shorter than the length, of basal portion. Clypeus and genae light gray, with 
white hair. Second palpal segment reddish brown, with black hair, the length 
and width moderate. 
Mesonotum dark brown, with lines in the usual pattern and humeral and 
prescutal lobes paler. Pleura, sternum, and coxae gray. Wing hyaline, with 
brown veins, the venation normal. Legs dark reddish brown, with grayish 
pollen, the fore femur, apices of tibiae, and the tarsi nearly black; hind tibial 
fringe sparse, entirely black. 
Abdomen above dark brown, with three rows of nearly white spots, the 
median. spots on tergites 24 triangular, not quite reaching length of tergites, 
sublateral spots oblique, faint on tergites 1 and 3, lacking or extremely faint on 
4—7; venter dark brown, with white hair, the sutures narrowly whitish. 
Male.—K\ye bare, the areas of large and small facets sharply differentiated ; 
frontal triangle flat, pollinose; extreme base of third antennal segment orange; 
second palpal segment pale yellowish, with some black hair apically, about 
twice as long as thick, the apex blunt. Body coloration essentially as in 
female. 
Type.—A male from Trenton Falls, N. Y., one of two male cotypes, 
Museum of Comparative Zoology No. 4042, herein designated as 
lectotype. 
