HORSEFLIES OF THE SUBFAMILY TABANINAE 33 
Type.—Female, in the American Museum of Natural History. 
Type locality —Gainesville, Fla. 
The type was collected some time between September 26 and 
October 2, 1914. 
STENOTABANUS MAGNICALLUS (Stone), new combination 
(Fig. 12, A) 
? Tabanus nanus Macquart, Dipteres exotiques nouveaux ou peu connus, sup. 1, 
pp. 42-48, 1846. (Preoccupied by Tabanus nanus Wiedemann.) 
Tabanus maritimus Townsend, Ent. News 9: 167, 1898. (Preoccupied by 
Tabanus maritimus Scopoli.) 
Tabanus magnicallus Stone, Ent. Soe. Wash. Proc. 37:19, 1935. 
Small; gray, with nearly uniformly creamy-white abdomen; frons very broad; 
strong stump vein at base of vein R:. 
Female.—Length 11 mm. Eye bare. Frons very broad, its height about one 
and one-third times width at base, slightly widened above, cream colored, with 
white hair; basal callus shiny black, nearly twice as broad as high, not quite 
touching eyes, very strongly swollen on each side of middle, and overhanging 
subeallus, the dorsal margin slightly concave; the median callus a short, black, 
median line above, slightly widened at top; vertex raised, the lower margin of 
raised portion a well defined, convex curve; extending straight across this raised 
portion a shiny-brown band touching eyes; subcallus broad, cream colored. 
First two antennal segments creamy white, with pale and some black hair; first 
Pols TaN 
Ficure 12.—Antenna, front view of head, and palpus of (A) Stenotabanus magnicallus, 
(B) S. psammophilus, and (C) S. floridensis. 
segment about as broad as long, second about half length of first, without a 
dorsal process; third with basal portion brown, yellowish at extreme base, the 
upper margin only slightly swollen, and a few black hairs at summit; width at 
base about two-thirds of length; annulate portion slightly longer than basal 
portion, stout, black, with a few black hairs. Clypeus and genae white, with 
white hair. Palpus cream colored, with white hair, the second segment very 
short and swollen, nearly as wide as long. Proboscis stout, only a little longer 
than palpus. 
Thorax yellowish brown, with short white hair, slightly grayer below. Wing 
hyaline, without spots, the veins dark brown except those of costal region, 
which are yellow; base of vein R: rectangular, with a strong stump; vein 
Cu: not reaching wing margin (in the two specimens examined). Legs yellow- 
ish, grayer basally, with pale hair except for some black hair on tarsi. 
Abdomen rather elongate, nearly uniformly cream colored, the incisures 
slightly paler. 
Male.—According to Townsend the difference between the large and small 
tacets of the eye is not marked, but gradual and slight, the large facets confined 
to the inner central portion of the eye. A specimen in poor condition, from 
Galveston Island, Tex., appears to be this species but the large and small 
facets are distinctly differentiated and the area of large ones extensive. The 
whole body is densely clothed with short, white pubescence. 
Cotypes.—Three males, collection unknown. 
Type locality—Padre Island, Tex. 
Distribution —Gulf coast of Texas from Galveston south. May 
(Galveston) to August 8 (Brazoria County). In the United States 
National Museum, one female. 
38521°—38——3 
