TABANID^ OP OHIO. 57 



posterior margin and with darker hairs on the basal part, wings hyaline, 

 legs somewhat variable but inclined to black with the basal part of the 

 tibiae yellow, abdomen with a prominent middorsal row of. gray triangles 

 and gray spots on each side. 



Female : Palpi light yellow front noticeably gradually widened 

 above, frontal callosity below nearly as wide as the front, about square, 

 above with a narrowed extension which reaches. half way to. the vertex; 

 segments of the abdomen above with gray posterior -margins which 

 e:>cpand into prominent triangles in the middle ; first two segments nearly 

 uniform gray on the sides, next three segments with extensive gray 

 markings enclosing a black patch on the anterior part of the segments, 

 last three segments largely black on the sides ; the black on the second 

 segment takes the form of two spots connected before and produced 

 laterally so as to include the anterior margin of the segment; on the 

 following three segments the black takes the form of four spots, the middle 

 twa of 'which are united before. 



Male: Antennae black, palpi darker than in the female, and the 

 legs may be said to be uniform black except that the bases of all the tibiae 

 are pale ; abdomen with more gray than in the other sex but the arrange- 

 ment is the same. . ■ _.. ' - 



Habitat : Oxford, Georgesville, Loudonville and Medina. 



The two sexes are easily associated. The species may be 

 confused with nivosus, coffeaHis, longus and some of the species 

 with hairy eyes, but these latter need not enter into the case if 

 care is exercised. From longus its uniform black instead of red- 

 dish color is distinctive, coifeatus has only the posterior margins 

 of the segments white on the sides, and a reference to the descrip- 

 tion of nivosus above will reveal the difference between vivax and 

 that species. 



The larvae live in streams, and the females have been observed 

 ovipositing on stones in ripples. The tgg mass is not so convex 

 .as in many other species, but covers more surface. 





.o;ji../ -o ,^,y. 



