20 MISC. PUBLICATION 305, U. S. DEPT. OF AGRICULTURE 
ATYLOTUS PYGMAEUS (Williston), new combination 
(Fig. 6, B) 
Tabanus pygmaeus Williston, Kans. Acad. Sci. Trans. 10: 141, 1887; Philip, 
Bull. Brooklyn Ent. Soc. 31: 194, 1936. 
Small; blackish; abdomen aboye with three rows of gray spots; basal callus 
very small; third antennal segment with only two distinct annuli. 
Female—Length 7-9 mm. Eye green on upper half, purple below, with 
sparse, Short pile. Frons dark brown, about three times as high as wide, with 
nearly parallel sides; basal callus indistinct, sometimes entirely covered with 
pollen and never very much denuded; no median callus; sometimes a small 
tubercle at vertex; subcallus and upper genae concolorous with frons. An- 
tenna dark brownish black, the basal portion of third segment about two- 
thirds as long as broad, with a rounded angle beyond middle of dorsal margin 
and a convex ventral margin; annulate portion short and stout, shorter than 
width of basal portion, with two distinct annuli and an indication of a third. 
Clypeus and lower genae white, with white hair. Palpus creamy white, -the 
second segment moderately stout at base, tapering to a slender apex, with white 
and a few black hairs. 
FIGURE 6.—Antenna, front view of head, and palpus of (A) Atylotus insuetus, 
(B) A. pygmaeus, and (C) A. bicolor. 
Mesonotum dark brown, the mesoscutum with three narrow grayish stripes. 
Pleura, sternum, and coxae brownish gray, with concolorus hair. Wing hyaline, 
the stigma brownish; venation normal. Femora brownish black; tibiae whitish | 
basally, dark brownish apically, the brown more extensive on fore tibia than | 
on others; tarsi black, the first segment of middle and of hind tarsus pale. 
Abdomen dark brown, with a median row of small gray triangles and larger, 
oblique, sublaterai, gray spots LE reach hind and lateral margins of tergites; 
venter mostly grayish. 
Male.—Described by Philip but not seen by the writer. 
Type.—Female, University of Kansas. 
Type locality.—¥ lorida. 
Distribution —Delaware to Florida. June il (Nassau, Del.) to Au- 
gust 22 (Lloyd, Fla.). In the United States National Museum, one 
female. 
ATYLOTUS INSUETUS (Osten Sacken) 
(Fig. 6, A) 
Tabanus insuetus Osten Sacken, U. S. Geol. and Geogr. Survey Terr. Bull. 
3: 219, 1877; Hine, Ohio Nat. 5: 238, 1904; Webb and Wells, U. S. Dept. 
Agr. Dept. Bull. 1218: 26-29, 1924; Cameron, Bull. Ent. Research 17: 
30-31, 1926; Rowe and Knowlton, Canad. Ent. 67: 242, 1935; Philip, Canad. 
Ent. 68: 158-159, 1936. 
Atylotus insuetus Osten Sacken, Smithsn. Misc. Collect. No. 270, p. 62, 1878. 
Tabanus utahensis Rowe and Knowlton, Canad. Ent. 67: 242, 1935. (New 
synonymy. ) 
Tabanus insuetus var tingaureus Philip, Canad. Ent. 68: 159-160, 1956. (New 
synonymy.) 
Rather small; body coloration variable, yellowish or grayish; palpus yellow- 
ish to white; basal and median calli present, but former somewhat reduced so 
that it touches neither eyes nor subecallus. 
Female——Length 12 mm. Eye with short, fine pile, pale yellowish green, 
with a narrow, diagonal, purplish band from inner lower angle. Frons gray, 
tinged with yellow, with black and pale-yellowish hair, two and one-half times 
as high as wide. with nearly parailel sides; basal and median calli shiny 
