-TABANIDA, OF OHIO. _ 39 
Habitat: Taken in Central Ohio. It appears usually by the 
middle of May. 
, . This species is one of the first to appear in the spring, and 
females have been observed ovipositing on plants growing along 
the margin of a small lake on the University grounds. Males 
have been taken near where the females were ovipositing and on 
flowers of Cornus. The eggs are placed in single layers on grass 
blades that hang out over the edge of the water. 
CHRYSOPS LUGENS Wiedemann. 
Length 8-9 mm. First segment of the antennae yellow, second 
variable but*usually yellow, third black, face yellow, its lateral: callosities 
black; the hyaline triangle of the wing does not cross the second longi- 
tudinal vein; the apical spot includes nearly all of the second submarginal 
and the apex of the first posterior cells, so that the triangle is narrow 
and may be said to be lunate; the abdomen is wholly black above or 
marked on the basal part with three yellow longitudinal stripes. 
Female: Frontal gallosity black; thorax dorsally with two greenish 
grdy stripes, narrowly separated by brown, first basal cell brown, second 
hyaline; the cross band fills out the fourth posterior cell; posterior branch 
of the fifth vein obscurely. margined. 
_ Male: Medium stripes of the thorax more yellow than in the 
female, second basal, fifth posterior, and anal cells largely infuscated ; 
to the unaided eye a subhyaline streak is visible beginning at the margin 
of. the wing and passing the length of the fifth submarginal cell into the 
second basal and thence toward but not attaining the base of the cell; 
this sex is much like the female and easily associated with it. 
Habitat: Taken at- Medina, Ohio. 
‘CHRYSOPS MOECHUS Osten Sacken. 
“Length 8 mm. Hyaline triangle of the wing very small occupying 
only part of the second and third posterior cells. 
-- ° Female: Face, palpi and base of antennae yellow, frontal callosity 
black; first basal cell of wing infuscated, second hyaline except a margin 
along the vein which separates it from the first, the cross band reaches 
the, posterior margin .filling out the fourth posterior cell; in the fifth 
posterior cell there is a margin along the posterior intercallary’ vein and 
also along the posterior branch of the fifth; the apex of the anal cell ‘is 
slightly infuscated; dorsally the markings of the abdomen are variable 
but. four longitudinal rows of dark spots are usually visible. 
Male: Face yellow, otherwise whole body including most of the 
wings black; the only trace of hyaline in the basal cells is a dot on the 
fourth vein near the base of the discal cell. 
Habitat: “Common all over Ohio. 
The very small hyaline triangle serves to distinguish this 
spéciés from others, and also to associate the séxes which are 
strikingly different in coloration. 
toteT-have observed the females ovipositing. on foliage overhang- 
ing a a imill race at’ Georgesville, Ohio, June 4; 1890. * 
Tae > . . r= 
