HORSEFLIES OF THE SUBFAMILY TABANINAH 103 
stout, tapering to a blunt apex, dark reddish brown, with short black hair, 
sometimes mixed with pale hair. 
Mesoscutum and scutellum reddish brown, with brownish pollen, the former 
with rather indistinct, alternate stripes of dark and pale hair; prescutal lobe 
with considerable black hair. Pleura and sternum reddish brown, with gray 
pollen and yellowish-white hair. Wing subhyaline, the costal cell deeply in- 
fuscated and whole fore part of wing uniformly dark reddish brown. Legs 
reddish brown, the tibiae somewhat paler and tarsi darker than femora; hair 
ot tibiae, including hind tibial fringe, pale yellowish brown. 
Abdomen dark reddish brown, with small, narrow, median, white triangles 
on hind margins of tergites 1-6; some pale hair on lateral margins of tergites 
2-5; venter gray, with a rather distinct, broad, median, brown stripe; hind 
margins of each sternite with a narrow fringe of yellowish hair. 
Male.—Eye flattened above, the areas of large and small facets distinctly 
differentiated. Coloration of body as in female, but considerably darker, all 
the hair brown or black, the abdominal triangles faint and hind tibial fringe 
dark brown. 
Type.—lIn the British Museum. 
Type locality.—Massachusetts. 
Distribution—Southern Canada and United States west to Minne- 
sota and south to North Carolina. June 27 (Ware, Mass.) to Sep- 
tember 13 (Ramsey, N. J.). In the United States National Museum, 
14 females, 6 males. 
Osten Sacken examined specimens of 7abanus catenatus Walker in 
the British Museum and declared them to be 7’. turbidus Wiedemann 
and 7. giganteus Degeer. Hine, in his manuscript notes made at the 
British Museum, stated that catenatus was nearer orion Osten Sacken 
than any other species. Dr. John Smart very kindly compared three 
specimens which the writer sent him with the type of catenatus. He 
found them to agree so closely that he could “feel confident that they 
are the same species.” Since only one specimen is mentioned in 
Walker’s original description it is difficult to tell what Osten Sacken 
examined. Some of the cotypes of orton came from Massachusetts, 
while ¢urbidus never occurs there and giganteus probably rarely, if 
ever. ) 
TABANUS ACTAEON Osten Sacken 
(Fig. 47, A) 
Tabanus actaeon Osten Sacken, Mem. Boston Soe. Nat. Hist. 2 (pt. 4, No. 4): 
443, 1876; MeAtee and Walton, Ent. Soc. Wash. Proc. 20: 201-202, 1918; 
Philip, Minn. Agr. Expt. Sta. Tech. Bull. 80: 101, 1931. 
Rather large; brownish, with a median row of small white triangles on abdo- 
men; wing unspotted. 
Female.—Length 19-21 mm. Eye bare, unicolorous. Frons about three and 
one-half times as high as wide, parallel sided, gray, somewhat browner 
medianly ; basal callus chestnut brown to black, higher than wide, not quite 
touching eyes and abruptly narrowing to a narrow median callus reaching to 
upper third of frons; subcallus pale brownish. First two antennal segments 
reddish brown, with black hair; third nearly or quite black, except at extreme 
base, the dorsal angle prominent, rectangular, and the excision deep; annulate 
portion about two-thirds length of basal portion. Clypeus and genae gray, with 
white hair. Second palpal segment brown, with short black hair, moderately 
heavy and elongate, the apex rather blunt. 
Mesonotum black, with reddish lines in the usual pattern and a mixture of 
yellowish brown and black hair; prescutal lobe reddish brown or _ black. 
Pleura, sternum, and coxae gray, in part tinged with reddish, and with white 
hair. Wing nearly hyaline, unspotted; cell Rs slightly narrowed apically. 
Femora reddish brown, the fore femur darkest; tibiae yellowish brown, the 
apical half of fore tibia and extreme apices of others dark; division between 
light and dark areas on fore tibia sharp; hair of pale portion of all tibiae 
light yellowish; hind tibial fringe mostly white; tarsi dark brown to black. 
