TABANIDA) OF OHIO. 41 
branch of the fifth vein is plainly margined on both sides with brown 
and this margin communicates more or less with the cross band across 
the fifth posterior cell; the first abdominal segment has-a rather obscure 
dark patch beneath the scutellum, the second has two elongate oblique 
black spots connate anteriorly, and sometimes on either side near the 
posterior margin a very small additional spot; the third and fourth each 
have four black spots, and in some specimens five has likewise, but 
usually five, six and seven are uniformly black on the whole anterior 
part; all the segments behind the first are narrowly margined with yellow; 
ventrally, abdomen yellow with apex and narrow lines on the sides of 
some of the segments blackish. 
Male: Both basal cells infuscated except a small hyaline patch at 
the apex of each; the first segment of the abdomen is blackish with the 
exception of a yellow posterior margin which is slightly expanded on 
either side, the second has a large quadrate black spot in the middle 
enclosing a small yellow triangle posteriorly and on each side a narrow 
longitudinal spot also black; three and four are colored like two; the seg— 
ments behind the second are plainly margined posteriorly with yellow 
and five, six and seven are uniformly black in front. These markings 
form a wide longitudinal black stripe in the middle of the abdomen 
enclosing small yellow triangles on segments two to four, and on each 
side of this a much narrower black stripe followed by a still narrower 
black stripe. Hitherto this sex has not been described. 
Habitat: Northern and Southern Ohio. 
I have never found the species common except at Cincin- 
nati in the region of a series of small artificial lakes. Here the 
females were very persistent in attacking me, and I procured 
males by sweeping the plants that grew along the edge of one of 
the lakes. 
CHRYSOPS NIGER Macquart. 
Length 6-8 mm. First segment of antennae yellow, face yellow 
with cheeks and facial callosities black; body and legs except the metatarsi 
and part of the following segment on the middle and posterior pairs, black; 
apex of wings beyond the cross band hyaline. 
Female: First basal cell of wing brown except a small spot near the 
apex bordering the fourth longitudinal vein, second basal hyaline; the 
cross band nearly fills out the fourth posterior cell but does not enter the 
fifth posterior; the very narrow hyaline apex of the fourth posterior cell 
varies slightly in width in different specimens. 
Male: Colored like the female except only a small spot at apex 
of the second basal cell is hyaline, and the fifth posterior, except at 
extreme base, and anal cells are dimly infuscated. 
Habitat: A common species in Ohio and one of the earliest 
to appear in spring. 
_ The entirely hyaline second basal cell distinguishes the female 
of this species from all others of its group. The small size of the 
hyaline spots in the apex of the basal cells are characteristic of 
the male. The hyaline spot of the first basal is very small and 
borders the fourth vein. 
