120 MISC. PUBLICATION 305, U. 8. DEPT. OF AGRICULTURE 
Abdomen above dark brown, with a median, parallel-sided stripe of yellowish 
brown and usually small sublateral spots of the same color; venter yellowish 
brown, dusky apically. 
Male—Unknown. 
Coty pes—Females, in the collection of Ohio State University and 
probably in the United States National Museum. 
Type locality —Baton Rouge, La. 
Distribution.—South Carolina to Louisiana. June 6 (Opelousas, 
La.) to August 3 (Tallulah, La.). In the United States National 
Museum, 14 females. 
TABANUS NIGROVITTATUS Macquart 
(Fig. 56, C) 
Tabanus nigrovittatus Macquart, Diptéres exotiques nouveaux ou peu connus, 
sup. 2, pp. 40-41, 1847; Osten Sacken, Mem. Boston Soc. Nat. Hist. 2 (pt. 4, 
No. 4) : 449-450, 1876; Hine, Ohio Nat. 7: 25-26, 1906; La. Agr. Expt. Sta. 
Bull. 93 : 58-54, 1907. 
Tabanus simulans Walker, List of the Specimens of Dipterous Insects in the 
Collection of the British Museum, pt. 1, p. 182, 1848. (New synonymy.) 
Tabanus conterminus Walker, Insecta Saundersiana, Diptera, v. 1, pp. 24-25, 
1850. 
? Tabanus allynii Marten, Canad. Ent. 15: 110-111, 1883. 
Rather small; abdomen yellowish sublaterally, with a pale median stripe; eye 
with a single purple band; costal cell dilute yellow; clypeus, genae, and palpus 
tinged faintly, if at all, with yellow; frons with nearly parallel sides; third an- 
tennal segment with annulate portion longer than basal portion. 
Female.—Length 9-14 mm. Eye bare, green, with one purple band. Frons 
yellowish gray, Slightly over three times as high as width at base, only slightly 
widened above; basal callus shiny black, subquadrate; median callus a short, 
slender line, often extremely narrow and separated from basal callus; vertex 
pollinose, smooth; subeallus and top of genae concolorous with frons. First 
two antennal segments yellowish brown, with black hair; third orange, darkened 
apically, the dorsal angle distinct, obtuse, the dorsal excision moderate; annu- 
late portion usually slightly longer than basal portion. Clypeus and lower 
genae gray, with white hair. Palpus whitish; the second segment with white 
and some scattered black hair and moderately swollen at base, strongly taper- 
ing apically. 
Mesonotum gray to grayish yellow, with erect black hair and recumbent yel- 
lowish hair and little if any indication of stripes; prescutal lobe concolorous with 
rest of mesonotum or tinged with yellow brown. Pleura, sternum, and coxae 
gray, weakly tinged with yellow. Wing hyaline, the costal cell pale yellow; 
venation normal. Femora gray tinged with yellow, the apices somewhat orange 
brown; tibiae yellow brown, the apical half of fore tibia nearly black and ex- 
treme apices of others slightly darkened; tarsi dark brown to black. 
Abdomen above yellowish brown, with a dark-brown to black, rather broad, 
median stripe and a narrow, lateral, dark-brown stripe, evanescent anteriorly ; 
on the median dark stripe lies a narrow, parallel-sided, pale grayish-yellow 
stripe; the yellowish-brown area between the median and lateral darker areas 
may be in the form of distinct, somewhat oblique spots, or these spots may be 
so enlarged and confluent that definite spots are lacking; rubbed specimens may 
superficially resemble Tabanus daeckeit and related species; venter yellow 
brown, somewhat darkened apically and medianly. 
Male.—Areas of large and small facets of eye strongly differentiated, the 
large facets often rather widely separated from top of eye by a band of small 
facets. Palpus moderately stout, with an acute, usually decurved apex. Color- 
ation essentially as in female, the fore tibia less distinctly bicolored. 
Type.—Female, collection unknown. 
Type locality—Nova Scotia. 
Distribution—Coast from Nova Scotia to Texas. April 21 (Wa- 
kulla County, Fla.) to November 23 (Hillsboro County, Fla.). In 
the United States National Museum, 432 females, 12 males. 
