462 C. K. OSTEN SACKEN'S TRODRO.ME 



existence of any other species with which to identify the description, render the sj'nonymy 

 certain. In this species the ocellar tnbercle is not visible ; the pubescence of the eyes in 

 the male is very distinct ; in the female very short, and often hardly visible. The colora- 

 tion of the eyes of the female (revived on wet sand) appeared not unlike that of T. tri- 

 junctus, catenatus, and that whole group : two bluish green stripes, with a rather broad 

 interval ; the lower stripe bent towards the upper one at the outer end, without, however, 

 reachino- it. 



o 



42. Tabanus cerastes n. sp. 



Female. Eyes pubescent ; face white, with white hair ; palpi rather stout, pale yellow, 

 with white, mixed with a few black hairs ; antenna) reddish, thii-d joint very deeply ex- 

 cised, almost crescent-shaped, upper angle drawn out in a rather long liorn, which, as 

 well as the annulate portion of tlie third joint, is black ; sometimes the whole joint, 

 except the base, is brownish ; front moderately broad, grayish yellow ; callosity brownish 

 red, large, square ; a spindle-shaped brown line above it is usually disconnected from it ; 

 (in my three specimens this line has a well marked groove in the middle, which ends in a 

 deep puncture on the callosity ; this may be a merely adventitious character of the species). 

 Thorax of a light chocolate brown with whitish lines ; pleura3 wdiitish, with white hair. 

 Abdomen of a light cliocolate brown, with white triangles in the middle, and rather large, 

 oblique, white spots on the sides. Venter densely clothed with whitish pollen, and with a 

 trace of a longitudinal brown stripe. Feet reddish, whitish pollinose, and with white hairs ; 

 tips of tibiaj and all the tarsi brown. Wings subhyaline, faintly tinged with brownish 

 between the root and the stigma ; first posterior cell broadly open. Length, 15-16 mm. 



Ilab. Kentucky (Bee Spring, June, F. G. Sanborn) ; Wisconsin (R. Kennicott). 



The long horn-like upper angle of the antenna^, as well as the peculiar brown coloring, 

 renders this species easily recognizable. 2\ sciius Walker seems to have antenna) of the 

 same structure ; in other respects its description is entirely unmeaning. The words " an- 

 tennes a dent tin peu allongee," in Macquart's description of his T. kirtiocidatus 5 

 (Dipt. Exot., 5" Suppl., p. 33), together with the pubescent eyes, may indicate the unknown 

 male of my T. cer-astes ; still the data of the description are not sufficient to warrant the 

 identification of the female. The eyes of an alcoholic female showed a single Ijluish stripe 

 in the middle. 



C. Tabani with pubescent eyes and with an ocellar tubercle (subgenus Therioplectes). 



43. Tabanus flavipes. 



Tahamis flavipes AVioilcmnnn, T, p. 137, 41. 



Female. Eyes pubescent, face yellowish gray, with dense yellow hair on the cheeks ; 

 some blackish hairs below the eyes; palpi long and narrow, black. Antennfe dark red; 

 third joint black on its distal half, excised above, and with a projecting upper angle; front 

 rather broad, narrowed anteriorly, dark grayish ; callosity very convex, with a more or less 

 spindle-shaped prolongation above ; the subcallus in all my specimens is denuded, shining. 

 Thorax black, with black, erect pile, mixed with yellowish hairs, especially in front; ante- 

 alar tubercle black ; pleura) black, clothed with sparse yellowish hairs, which are denser 



