36 OHIO STATE ACADEMY OF SCIENCE. 
The hyaline basal cells in the female and the hyaline apical 
third of the same in the male, and the absence of the black tri- 
angle on the posterior margin of the side of the second segment 
in both sexes, serve to distinguish this species. 
CHRYSOPS CELER Osten Sacken. 
Length 8-10 mm. Whole body black, apex of the wing beyond the 
cross band clear hyaline. 
Female: Base of antennae yellowish; sides of the thorax with a 
conspicuous tuft of yellow hairs in front of the wings; both basal 
cells of the wings brown on the basal three-fifths; cross band very nearly 
reaching the posterior margin filling out the fourth posterior cell with 
the exception of a very narrow apex; the fifth posterior cell is infuscated 
across its base but the apex is hyaline. 
Male: Black including all the atennae and the hairs on the sides 
of the thorax; wing like that of the female except the anal cell is wholly 
infuscated, and the hyaline spot at the apex of each of the basal cells 
is shorter; these spots occupy the entire width of both cells. 
Habitat: Has been taken in central and southern Ohio, and 
usually appears by May 15th. 
The female is distinguished from all other species by the 
tufts of yellow hairs on the sides of the thorax. ° The male is 
distinguished from that of niger by the hyaline spots at the apex 
of the. basal cells, occupying the whole width of these cells; and 
from that of fugaxr by the cross-band practically filling out the 
fourth posterior ‘cell. 
This is a common species in various parts of Ohio during 
the latter half of May. The eggs have been observed commonly 
along the margin of ponds and artificial lakes clinging to various 
kinds of foliage overhanging the water. The female has been 
observed ovipositing on different occasions, and is the only species 
of the genus observed placing its eggs in masses composed of 
layers one above the other as in Tabanus. Both sexes have often 
been taken from flowers, the females are annoying to stock, and 
persist in their attacks, and the male is occasionally found rest- 
ing on foliage. 
CHRYSOPS FALLAX Osten Sacken. 
Length 6-8 mm. Face, palpi and base of antennae yellow, the 
hyaline triangle reaches the costa, separating the apical spot from the 
cross band; the cross band occupies nearly all of the space beyond a 
line from the apex of the first vein to the apex of the posterior branch of 
the third vein; the distal border of the cross band is quite regular and 
is marked by a slight curve from the costa just before the apex of the 
first vein to the apex of the anterior branch of the fifth vein; the fourth 
posterior cell is entirely filled out with brown, the posterior branch of the 
fifth vein is slightly margined with brown on | both sides and both basal 
cells are hyaline. 
