58 MISC. PUBLICATION 305, U. 8. DEPT. OF AGRICULTURE 
Mesonotum dull black, with yellowish-brown and white pile: prescutal lobe 
reddish. Pleura, sternum, and coxae gray, with white hair. Wing hyaline, 
the costal cell yellowish; venation normal. Femora yellowish brown to black; 
tibiae yellowish brown, the apex of fore tibia darker; hind tibial fringe black; 
tarsi dark brown. 
Abdomen black medianly, with a faint median line of yellowish triangles, 
the median black stripe widening on each segment; tergites 14 orange brown 
laterally, with paler-brown oblique spots next to the median black stripe; 
tergites 5-7 entirely black; venter mostly yellowish brown, darker apically 
and medianly. 
Male.—Eye densely pilose, the upper facets distinctly larger than the lower 
facets, the line of differentiation distinct: antenna with basal portion of third 
segment not unusually stout, annulate portion considerably longer than basal; 
frontal triangle yellowish gray. Body color essentially as in female. 
Cotypes——In the collection of Ohio State University. At least 
one female that is probably from the original series is in the United 
States National Museum. 
_Cotype localities —Arizona and northern Mexico. 
_Distribution—Arizona to Chihuahua. July 17-20 (Mud Springs, 
Santa Catalina Mountains, Ariz.). In the United States National 
Museum, five females. 
TABANUS ERYTHRAEUS (Bigot) 
(Wig. 17,.A) 
Atylotus erythraeus Bigot, Mem. Soc. Zool. France 5: 661, 1892. (Not Tabanus 
erythraeus Bigot, ibid., pp. 687-688.) 
Tabanus erythreeus Philip, Bull. Brooklyn Ent. Soc. 31: 191-192, 1936. 
Rather small, slender: orange brown and black, with the abdomen strongly 
tinged with orange brown and with three rows of grayish triangles; first anten- 
nal segment enlarged. 
Female.—Length 13-15 mm. Eye with very short. fine pile.. Frons nearly 
four times as high as width at base, slightly widened above, yellowish, grayer 
at vertex: no ocellar tubercle: basal callus orange to dark brown, nearly as 
broad as long and narrowed above: a very slender, short, median callus of same 
color, which may or may not be joined to basal callus; subcallus creamy yellow. 
First antennal segment cream colored, with coarse black hair and much swollen 
above so that it is wider apically than widest part of third segnrent; second seg- 
ment small, with a distinct dorsal process, orange brown, with black hair; third 
segment orange brown at extreme base, but annulate portion and most of basal 
portion black; basal portion about two-thirds as wide as long, with prominent 
dorsal angle and a distinct excision: annulate portion about as long as width of 
basal portion. Clypeus and genae gray, with white hair. Second palpal seg- 
ment of moderate width basally, tapering to a blunt apex, cream colored, with 
coarse black and fine white hair. 
Mesonotum dark gray, the mesoscutum with stripes of yellowish hair in usual 
pattern: prescutal lobe reddish, with black hair. Pleura reddish above, the rest 
of thorax and coxae gray, with whitish hair. Wing hyaline, with dark-brown 
veins, the venation normal. Fore femur black, the others reddish brown; tibiae 
yellowish, except the black apical half of fore tibia; fore tarsus black, the 
others dark reddish brown. 
Abdomen dark brown medianly, orange brown laterally, with three rows of 
gray spots: the median spots consisting of a snyall one on first tergite and a row 
of contiguous triangles each with base on posterior margin and just touching 
anterior margin; sublateral spots oblique. broadly touching hind margin of 
each tergite; venter dull orange brown, darker apically. 
Male—Eye with distinct, short pile, but this not much more dense than in 
female; facets of eye nearly uniform in size, the upper, larger ones not sharply 
differentiated from the lower ones; first antennal segment very prominent; sec- 
ond palpal segment cream colored, the tip acute and slightly curved downward. 
Coloration as in female, the abdomen with somewhat more orange brown. 
Described from six males. from the Pinaleno and Santa Rita Moun- 
tains in Arizona and Animas Peak, N. Mex. 
