36 OHIO STATE ACADEMY OF SCIE;ncB. 



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 Ostcn Sackcn. 



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 fugax 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 overhaneing 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 Ostcn Sacken. 



Length 6-8 mm. Fdce, 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. 



