HORSEFLIES OF THE SUBFAMILY TABANINAE 25 
LEUCOTABANUS ANNULATUS (Say), new combination 
(Fig. 8, A) 
Tabanus annulatus Say, Jour. Acad. Nat. Sci. Phila. 3: 32-83, 1823; Wiedemann, 
Aussereuropaische zweifltigelige Insekten, v. 1, p. 185, 1828; Say, Complete 
Writings, Le Conte ed., v. 2, p. 53, 1859; Osten Sacken, Mem. Boston Soc. 
Nat. Hist. 2 (sup.) : 555-556, 1878: Hine, Ohio Nat. 5: 234, 1904; La. Agr. 
Expt. Sta. Bull. 93: 43-44, 1907; Jones and Bradley, Jour. Econ. Ent. 16: 
310-311, 1923; Schwardt, Jour. Kans. Ent. Soc. 4: 10, 1931; Ark. Agr. Expt. 
Sta. Bull. 332: 26, 1936. 
Small; generally pale, the femora reddish; abdomen of female banded, of 
male largely white; thorax of male with dense white hair. 
Female.—Length 10-12 mm. Eye bare, or nearly so. Frons, subcallus, and 
top of genae orange brown; most of clypeus and lower part of genae light gray, 
with white hair. Frons five to six times as high as width at narrowest point, 
which is slightly above basal callus; basal callus brown, about one-half width 
ean 
Ficure 8.—Antenna, front view of head, and palpus of (A) Leucotabanus annulatus and 
(B) L. ambiguus. 
of frons, longitudinal, forming a swelling at base of a long, narrow, brown 
line, the latter reaching to upper third of frons; just below vertex a small 
ocellar tubercle, sometimes denuded and shiny, sometimes pollinose. Antenna 
nearly uniformly orange brown; first and second segments with black hair; 
basal portion of third without excision beyond dorsal angle, which is prominent 
and slightly obtuse; annulate portion slightly longer than basal portion. Second 
palpal segment slender, with only a slight angle at base, pale yellowish, with 
black and white hair. 
Mesoscutum reddish or orange brown, with white pollen and yellowish-orange 
and white hair; hair of scutellum predominantly white. Pleura and sternum 
whitish, with white hair. Wing hyaline, with brown veins; venation normal. 
Femora reddish brown; tibiae white, with white hair except apical fourth of 
anterior tibia and tips of others, which are brown, with brown hair; tarsi 
brown, the first segment of middle tarsus with some white hair. 
Abdomen above reddish brown, with hind margins of segments pale; in well 
preserved specimens the hair on each tergite forming a wide anterior band of 
dark brown, a narrow band of yellow, widest medianly, and a very narrow 
posterior fringe of white; venter colored like dorsum, the base somewhat paler ; 
tip of abdomen compressed. 
Male.—Areas of large and small facets of eye distinctly differentiated, the 
latter in a narrow band that extends around margin to vertex. Second palpal 
segment pointed at tip, the hair long and white. Body, particularly thorax, 
densely clothed with white hair, brown hair absent. 
Type.—Lost. 
Type locality—Missouri. 
Distribution.—Southeastern part of the United States from Kansas 
to Delaware and Texas to Florida. May 6 (Magnolia, Fla.) to July 
26 (Ship John Lighthouse, Delaware River, Del.). In the United 
States National Museum, nine females, seven males. 
