42 OHIO STATE. ACADEMY OF SCIENCE. 
Different specimens of this. species taken in the same local- 
ity are quite constant; but there appears to be considerable: vari- 
ation in the amount of infuscation of the first basal cell when 
specimens from different sections are compared. Specimens from 
the southern part of its range seem to show the most hyaline in 
this cell: 
‘Common in May and June in all parte of the state. The 
females are often observed on horses and cattle. 
CHRYSOPS OBSOLETUS Wiedemann. 
Length 7-8 mm. Basal segments of antennae yellow, second and 
third segments usually black although the second is sometimes yellowish; 
face yellow, its lateral callosities black; thorax above with two medium 
greenish gray stripes narrowly separated by brown, the hyaline triangle 
of the wing crosses the second longitudinal vein and in most specimens 
reaches the. costa; the apical spot is confined to the distal parts of the 
marginal and first and second submarginal cells, the cross band nearly 
fills out the fourth p6@sterior cell leaving only an obsolete margin at 
its apex. 
Female: Frontal callosity black, both basal cells hyaline; aorealiey 
abdomen black with a yellow middorsal stripe on the first four segments; 
variations occur in which an additional yellow stripe is present on either 
side of the middorsal one, and in some specimens the first two segments 
are narrowly yellow on the sides. 
Male: Several specimens of this sex have the first basal cell infus— 
cated and the abdomen black above with the single middorsal yellow 
stripe; otherwise like the female. 
Habitat: Common all over Ohio. 
This is a common species in woods where the females are an 
annoying pest. I have taken numbers of the males by sweeping 
along the margins of artificial lakes. 
CHRYSOPS SACKENTI n. Sp. 
Length 8-10 mm. Abdominal segments one to four yellow on the 
sides; apical spot where it joins the cross band equal in width to the 
marginal cell plus one-fourth of the first submarginal at the same place. 
Female: Frontal callosity yellowish on the disk, and black on the 
margin; annulate portion of third atennal segment black, remainder of 
antennae, face and palpi yellow; first basal cell infuscated at base for 
about one-third its length, and at apex on the narrowed portion; second 
basal cell with a much shorter infuscation at base and scarcely any at 
apex; cross band abbreviated: behind, the fourth posterior cell not filled 
out with brown; the cloud on the last section of the fifth vein spreads 
practically across the anal cell and communicates with the:cross band 
across the base of the fifth posterior cell; dorsally, abdominal, segments 
three to six. with distinct posterior yellow margins which expand into 
prominent triangles in. the middle; second segment with a prominent 
triangle but not margined behind; none of the triangles reach the anterior 
margins of their respective. segments; ventrally, abdomen yellow’ with.a 
mid, ventral row of black spots and on each side.two narrow black stripes; 
dorsally, the black on the second segment is co posed of two oblique 
spots connate at the anterior third and AiR ee margins. 
