HORSEFLIES OF THE SUBFAMILY TABANINAE 81 
Female.—Length 18-21 mm. Eye bare, deep purple, with two green bands. 
Frons about four and one-half times as high as width at base, somewhat widened 
above, yellowish, the vertex gray, with black hair; basal callus .brown, dis- 
tinetly higher than wide, not touching eyes; median callus lanceolate, concolor- 
ous with, narrowly joined to, and slightly longer than, basal callus; subcallus 
pale yellow, only slightly convex. Antenna orange brown, somewhat darker 
apically ; first two segments with black hair, the second with a strong dorsal 
process; basal portion of third rather elongate, the dorsal angle prominent, rec- 
tangular, the dorsal excision strong and also about rectangular; annulate por- 
tion about equal in length to width of basal portion at its widest point. Clypeus 
and genae nearly white or yellowish white, with concolorous pile. Second 
palpal segment rather slender, moderate in length, with white and black hair. 
Mesoscutum with gray or yellowish pollen and pile, with four broad longi- 
tudinal stripes of dark-brown pollen and hair; a fringe of black hair on lower 
margin of prescutal lobe; heavy tufts of pale hair above and below wing base; a 
small dark triangle just before scutellum, which is entirely pale. Wing dilute 
brown, nearly hyaline, with dark clouds at furcation and cross veins; costal cell 
not noticeably darkened; cell Rs strongly narrowed apically or closed. Kemora 
dark brown, with long pale hair; tibiae pale yellow, with white hair, except 
apical half of fore tibia and apical fourth of middle and hind tibiae, which are 
dark brown to black, with black hair; hind tibial fringe prominent, yellowish 
white basally, black apically; tarsi nearly biack. 
Abdomen above mostly gray; first segment with indefinite dark markings lat- 
erally, but with a distinct pale spot just behind apex of scutellum; on each of 
tergites 2-6 are four dark spots which may be joined along anterior margin and 
which are usually completely separated from hind margin; on tergites 2-3 
the median dark spots afe always joined anteriorly, and these inverted V’s 
may reach the posterior margin; the lateral spots are shorter than the median 
spots, never touch the posterior margin, and only narrowly touch the lateral 
margin; venter with lateral thirds and a narrow hind margin on each sternite 
gray, the middle dark reddish brown. 
Male.—Areas of large and small facets of eye sharply differentiated, the 
small facets extending around upper margin of eye to vertex. Second palpal 
segment cream colored, with a tuft of black hair at apex. Coloration essentially 
as in female. 
Described from two specimens reared from larvae in Arkansas by, 
H. H. Schwardt. 
Type.—Female, Museum of Comparative Zoology No. 4037. 
Type locality—Near Mammoth Cave, Ky. 
Distribution.—Maryland to Texas. June 5 (Beaumont, Tex.) to 
October 5 (Crowley, La.). In the United States National Museum, 
14 females, 2 males. 
TABANUS MONOENSIS Hine 
(Fig. 30, A) 
Tabanus monoensis Hine, in Webb and Wells, U. 8S. Dept. Agr., Dept. Bull. 
1218; 29-31, 1924. 
Rather small; grayish; vertex with a subquadrate denuded spot; eye bare; 
furecation and basal section of vein Ms margined with brown. 
Female—Length 12-14 mm. Eye bare. Frons gray tinged with yellow, 
about three and one-half times as high as width at base, widened above; basal 
eallus shiny dark brown, subquadrate, touching eyes; median callus rather 
small, slender, tapering at both ends and usually narrowly joined to basal 
callus; a brownish-black denuded spot at vertex, scarcely raised, not touching 
eyes and narrowed anteriorly; subcallus yellowish brown, denuded or very 
thinly covered with grayish-brown pollen. Antenna orange brown, the first 
two segments and annulate portion of third slightly darkened; first segment 
not swollen above, with black hair above and white below; second with a 
distinct dorsal process; third with a short but distinet dorsal angle and 
shallow excision, the basal portion about two-thirds as wide as long and 
annulate portion not quite as long as basal portion. Clypeus and genae gray, 
with white hair, some black hair admixed above. Second palpal segment 
38521°—38——6 
