HORSEFLIES OF THE SUBFAMILY TABANINAD 17 
Tabanus cerastes Osten Sacken, Mem. Boston Soc. Nat. Hist. 2 (pt. 4, No. 4): 
462, 1876; Hine, Ohio State Acad. Sci. Spec. Papers 5: 49, 1903. (New 
synonylny. ) 
Medium sized; brownish; abdomen with three rows of whitish spots; third 
antennal segment with a distinct forward-projecting process. 
Female.—Length 13-16 mm. Hye distinctly pilose, green, with one diagonal 
bluish band. Frons about five times as high as width at base, distinctly nar- 
rowed above, yellow or yellowish gray; basal callus flat, shiny brown, as wide 
as frons, subquadrate; median callus slender, usually narrowly joined to basal 
eallus, with a more or less distinct, median, depressed line terminating below 
in a shallow depression; vertex shiny brown but with no ocellar tubercle, and 
usually somewhat concave; subcallus gray. Antenna orange brown, the annulate 
portion often darker; first two segments with short black hair; dorsal process 
of third extending upward and forward so that the distance from base of 
segment to apex of process is nearly equal to length of basal portion, the 
extreme dorsoventral width slightly shorter than this; annulate portion rather 
stout, as long as basal portion. Clypeus and genae white, with white hair. 
Second palpal segment moderate in width basally, tapering to a slender apex, 
creamy white, with pale, and sometimes a few black, hairs. 
Mesonotum reddish brown, with a mixture of pale and black hairs, the 
mesoscutum with an indication of pale lines in usual pattern. Pleura, sternum, 
and coxae white, with white hair. Wing hyaline, the veins dark brown; vena- 
tion normal. Legs reddish brown, with mostly pale hair, the tarsi and apices 
of tibiae somewhat darker but not strongly contrasted; hind tibial fringe black 
and white, the hairs short and inconspicuous. 
Abdomen nearly concolorous with mesonotum, with three rows of pale spots; 
sublateral spots on first and second tergites large, that on second usually extend- 
ing length of segment and reaching along posterior margin to side; median 
spot on second tergite a narrow triangle reaching length of segment but com- 
pletely separated from sublateral spots; on tergites 38-6 the sublateral spots 
rather small, round, usually completely surrounded by brown, the median tri- 
angles small; venter pale, with a faint and narrow, brown, median stripe. 
Male—kEye densely pilose, the areas of large and small facets not sharply 
differentiated ; second palpal segment rounded at apex; dorsal process of third 
antennal segment considerably shorter than in female. Coloration essentially 
as in female, but abdominal spots considerably smaller. 
Type.—Female, in the British Museum. 
Type locality. — Georgia. 
Distribution.—Wisconsin to Missouri and Maryland to Georgia. 
May 27 (Falls Church, Va.) to July 9 (Beltsville, Md.). In the 
United States National Museum, 15 females. 
The writer has studied a specimen compared by Hine and stated by 
him to be conspecific with the type of scita, and this example agrees 
with Tabanus cerastes as described by Osten Sacken. The latter 
examined the type of hirteoculatus Macquart and admitted that his 
cerastes Was a synonym. 
DICLADOCERA ANNULARIS (Hine), new combination 
(Fig. 5, A) 
Tabanus annularis Hine: Ohio Jour. Sei. 17: 269, 1917. 
Small but stout; brownish; frontal callus black; abdomen with narrow, pale 
bands. 
Female.—Length 10-12 mm. Eye with dense, short pile. Frons yellowish, 
about three times as high as width at base, slightly narrowed above; vertex 
shiny black, with a median depression, but no ocellar tubercle; basal callus 
shiny black, distinctly convex, as wide as frons, with median depression 
~ above; median callus a slender black line separated from spot at vertex and 
from basal callus; subcallus somewhat swollen, pale gray. Antenna dark red- 
dish brown, annulate portion black; first two segments gray, with black hair; 
basal portion of third with distinct angle below and a prominent forward- 
projecting process above, reaching to base of annulate portion; distance from 
38521°—38——2 
