432 C. R. OSTEN SACKEN'S PRODROME 



third posterior cell there is only a vestige of a cloud, while in T. fronto the cloud there is 

 nearly equal to that at the base of the second posterior cell. 



3. Tab anus tnjunctus. 



Tabanus trijunctus Walker, List, etc., V, p. 182. 



Female. Palpi reddish, dotted with minute black hairs; face grayish yellow, cheeks with 

 yellow pile ; antennae ferruginous ; the upper angle of the third joint sharp, projecting, 

 almost rectangular ; the annulate portion, in length, about equal to three-quarters of the 

 body of the joint ; front yellowish gray, nearly parallel ; callus convex, dark brown, 

 rounded above, and \nt\\ a spindle-shaped prolongation. Thorax reddish brown, with but 

 indistinct stri2:)es of grayish pollen ; pleuras grayish yellow with some blackish hairs in the 

 middle. Scutellum dark brown, its hind border reddish (in well preserved specimens this 

 color is concealed under a covei'ing of golden yellow pile). Abdomen blackish brown ; the 

 hind margins of the segments with yellowish white borders, expanding into large triangles 

 in the middle ; first and second segments often reddish on each side. Venter brown ; hind 

 margins of segments with whitish bands. Legs ferruginous red ; front femora, except the 

 tip and front tarsi blackish brown ; tips of the other tarsi brownish, hind tibiaB with a dis- 

 tinct fringe of rufous hairs. Wings brownish, tinged with ferruginous on the proximal 

 half and along the costa ; brown clouds on the bifurcation of the third vein, and on the 

 transverse vein at the base of the second posterior cell ; central crossveins also clouded, 

 posterior cell coarctate. Length, 17-21 mm. I have seen a specimen only 15 mm. long. 



Hah. Florida. Seven female specimens, partly from my own collecting, partly from 

 Messrs. Hubbard and Schwarz. (Ft. Capron, Florida, April 21-24.) 



The differences between this species and T. fronto have been fully explained under the 

 head of the latter. 



4. Tabanus fuscopunctatus. 



Tabanus fuscopunctatus Maequart, Dipt. Exot., 4'^ SuppL, p. 34, 108. 



Female. Palpi reddish ; face grayish yellow in some specimens, with brown hairs on the 

 cheeks, in others these hairs are yellowish ; antennas red ; third joint almost crescent- 

 shaped, its upper angle being drawn out in the shape of a curved point, or horn ; 

 front grayish yellow ; callus chestnut brown, with a linear prolongation above. Thorax- 

 of a dark reddish brown, Avith a slight grayish pollen ; a tuft of whitish hairs on each side, 

 between the root of the wings and the scutellum ; the latter dark reddish brown ; jjleurae 

 clothed with dense yellowish hairs, especially near the humerus, and under the root of the 

 wings ; in some specimens there is a tuft of black hairs in the middle. Abdomen reddish 

 brown or blackish brown ; a subtriangular small white spot in the middle of the hind mar- 

 gin of segments 1-6 ; no perceptible white border on the hind margins of the segmeiats, 

 except on the sides, which show the usual triangles of appressed pubescence. Venter 

 brown ; incisures yellowish white ; in an oblique light the whole venter appears sericeous,' 

 from a microscopic whitish jjubescence. Legs reddish, sometimes brownish red ; hind tibiaj 

 with a distinct fringe of hair. Wings subhyaline on their distal and posterior half ; large 

 and well marked blackish brown clouds on the central crossveins, the crossveins at the base 



