118 MISC. PUBLICATION 305, U. S. DEPT. OF AGRICULTURE 
Tabanus dbaltimorensis Macquart, Dipteéres exotiques nouveaux ou peu connus, 
sup. 5 pp. 64-65, 1855. 
Tabanus floridanus Szilady, Biologica Hungarica, v. 1, fase. 7, p. 24, 1926. 
(New synonymy.) 
Rather small; yellowish, with a median, parallel-sided stripe on abdomen, 
bordered by blackish; costal cell yellow; pleura and palpus strongly tinged 
with yellow. 
Female—Length 11-13 mm. Eye bare, green, with one diagonal purple 
band. Frons yellow, about four times as high as width at base, with parallel 
sides or almost imperceptibly widened above; basal callus shiny black, square or 
slightly higher than wide, not touching eyes; median cailus small, lanceolate, 
black, usually narrowly joined to basal callus; subcallus and extreme top of 
genae yellow. Antenna slender, orange brown, the annulate portion dark 
brown to black; first two segments with black hair; basal portion of third 
slender, but with a distinct dorsal angle and only a shallow excision; annulate 
portion rather stout, equal to or slightly longer than basal portion. Clypeus 
and lower genae yellowish gray, with yellowish hair. Second palpal segment 
moderate in size, slightly swollen at base, yellowish, with rather long, concolor- 
ous hair near base and short black hair. 
Mesonotum dark brown, with yellow pollen, erect black hair, and recumbent 
yellow hair; no indication of stripes. Pleura, sternum, and coxae gray, strongly 
suffused with yellow, with pale-yellow hair. Wing hyaline, the costal ceil 
rather intensely yellow. Coxae and femora yellowish olive, with yellow hair; 
tibiae orange yellow, the apical half of fore tibia, apex of hind tibia, and tarsi 
black. 
Abdomen above variable in color but always with a median stripe of pale- 
yellow pollen and hair the entire length; rest of dorsum nearly black except for 
a lateral patch of yellow orange, narrowing apically, on tergites 1-8 or 1-4; 
venter yellowish orange, darker apically. 
Male.—Areas of large and small facets of eye sharply differentiated, the 
former yellow or brown in dried specimens, the latter black. Coloration 
throughout similar to that of female, the hair longer and the abdomen with 
less black. 
Cotypes.—Three specimens mentioned in the original description, 
from Honduras, Massachusetts, and North America. According to 
John Smart of the British Museum, the specimen from Honduras 
cannot be found, and the specimen from Massachusetts does not bear 
a type label. 
Type locality—North America. 
Distribution —Colorado to Michigan and Quebec and south to 
Arkansas and Florida. June 1 (Monroe County, Mich.) to Sep- 
tember 10 (Falls Church, Va.). In the United States National 
Museum, 120 females, 40 males. 
The writer’s acceptance of the name vzcarius Walker for the species 
which has gone for so many years under the invalid name of Zabanus 
costalis Wiedemann is based upon the following facts: (1) The name 
has been placed as a synonym of costalis for many years and is ap- 
parently the first available synonym. (2) Hine examined the type of 
vicarius and a specimen compared by him with the type is costalis 
Wiedemann; (8) specimens of both costalis Wiedemann and nigrovit- 
tatus Macquart were sent to John Smart, who compared them with the 
two specimens of vicarius. The North American specimen was found 
to agree very closely with the costalis which was sent. The Massa- 
chusetts specimen apparently agrees more nearly with ngrovittatus. 
