162 MISC. PUBLICATION 305, U. 8S. DEPT. OF AGRICULTURE 
Type—aA. female in the British Museum. 
Type locality—Nova Scotia. 
Distribution—Montana and Colorado, and New York to Nova 
Scotia. June 17 (Peru, N. Y.) to September 19 (Cameron Pass, 
Colo.). In the United States National Museum, 53 females. 
The writer has seen specimens compared by Hine with the types of 
both Labanus frontalis and 7. incisus. This species has been deter- 
mined as septentrionaits many times and quite closely resembles it, 
but the writer believes it can be separated on the characters given in 
the key. On the other hand, specimens with somewhat more reddish 
sublaterally than usual are difficult to separate from sonomensis. It 
is to be hoped that further study may more clearly define these 
difficult western species. 
Masi 7 
af “ae |f 
A Ba 
Ficurp 79.—Antenna, front view of head, and palpus of (A) Tabanus frontalis and (B) 
T. septentrionalis. 
TABANUS SEPTENTRIONALIS Loew 
(Fig. 79, B) 
Tabanus septentrionalis Loew, Verhandl. Zool.—Bot. Gesell. Wien 8: 592-593, 
1858 ; Osten Sacken, Mem. Boston Soc. Nat. Hist. 2 (pt. 4, No. 4) : 467-469, 
1876; Coquillett, Wash. Acad. Sci. Proc. 2: 406-407, 1900; Hine, Ohio Nat. 
5: 243, 1904; Cameron, Agr. Gaz. Canada 5: 560, 1918; Hine, Canad. Ent. 
do: 145, 1928; Cameron, Bull. Ent. Research 17: 87-88, 1926; Philip, Minn. 
Agr. Expt. Sta. Tech. Bull. 80: 115, 19381. 
Tabanus canadensis Curran, Canad. Ent. 59: 82-83, 1927. (New synonymy.) 
Tylostypia septentrionalis Enderlein (not Loew?), Mitt. Zool. Mus. Berlin 11: 
363, 1925. 
Stypommia septentrionalis Enderlein, Sitzber. Gesell. Naturf. Freunde Berlin 
1934: 185, 1934. 
Rather small; blackish, with three rows of gray triangles on abdomen; 
femora dark; subcallus pollinose; eye pilose; palpus rather stout; third antennal 
segment slender; frons moderate in width and not greatly widened above; 
stump vein from vein R: rarely present. 
Female——Length 10-14 mm. Eye pilose, blue green, with three narrow 
purple bands and upper and lower margins tinged with purplish. Frons about 
three and one-half times as high as width at base, slightly widened above; 
frontal callus subquadrate or slightly wider than high, touching eyes, chestnut 
brown to black; median callus narrowly lanceolate, black, usually somewhat 
roughened and rarely connected with basal callus; ocellar tubercle orange 
brown, small but distinct; subcallus gray, the antennal pits yellowish. First 
two antennal segments yellowish brown to gray, with black hair, the second 
with a distinct dorsal process; third black, the basal half of basal portion 
usually orange; dorsal angle obtuse and excision very shallow, the annulate 
portion shorter than basal portion. Clypeus and genae light gray, with mostly 
white hair. Palpus creamy white, the second and often the first segment with 
black hair mixed with pale hair; second segment somewhat swollen basally. 
Mesonotum black, with faint gray lines in usual pattern; prescutal lobe usu- 
ally reddish brown. Pleura, sternum, and coxae dark gray tinged with reddish, 
with a mixture of pale and dark hair in varying proportions. Wing faintly 
brownish, the venation normal or rarely a short stump from vein R: Femora 
dark gray to black; tibiae yellowish to rather dark brown, the apical half of 
fore tibia blackened; hind tibial fringe black; tarsi orange brown to black, 
the fore tarsus darkest. 
