44 OHIO STATE ACADEMY OF SCIENCE. 



CHRYSOPS uNiviTTATus Macquart. 



Length 6-8 mm. Basal segment of antennae yellow, second a little 

 darker and third nearly black ; hyaline triangle of the wing reaches or 

 nearly reaches the second vein; the apical spot is large, occupying all the 

 marginal cell beyond the cross band, the broad apex of the first sub- 

 marginal, all the second submarginal except a small patch at base and the 

 apex of the first posterior; the cross band entirely fills out the fourth 

 posterior cell. 



Female: Frontal callosity black, face yellow, its lateral callosities 

 brown or black ; first basal cell brown ; second basal cell with a very 

 little brown at base ; posterior branch of the fifth vein narrowly mar- 

 gined with brown, abdomen with a middorsal yellow, longitudinal stripe' 

 with a black stripe of about the same width on either side of it; outside, 

 the black stripes the abdomen may be entirely yellow, or all but the 

 first two segments may be dull black, or there may be a narrower black 

 stripe beginning on the third segment and continuing onto the fourth, 

 and fifth segments ; the last three abdominal segments are often blackish 

 obscuring all stripes in that region. 



Male : Second basal cell of wing brown on its basal two-thirds and 

 the fifth posterior more brown than in the female ; last three segments of 

 the abdomen black, first four with a middorsal yellow stripe, on each side 

 of which is a wider black one ; and outside of the latter on segments 

 three and four is an additional narrow black stripe. The three specimens 

 of this sex I have present no variations. It looks much like the female 

 and is easily associated with it. 



Habitat : A common species in June in all parts of the state. 

 The males have been taken on various flowers. 



CHRYSOPS viTTATUs Wiedemann. 



Length 8-9 mm. Face, palpi and base of antennae yellow; thorax 

 dorsally with four bright yellow longitudinal stripes with brown intervals 

 separating them ; scutellum yellow ; hyaline triangle of the wing rather 

 small occupying the apical part of the first three posterior cells and 

 extending into the first and second submarginal in the region of the 

 branching of the third vein ; a hyaline streak in the second submarginal 

 cell usually follows . the posterior branch of the third vein toward the 

 margin of the wing but does not reach this margin. 



Female: Frontal callosity yellow; first basal cell of wing brown, 

 second slightly infuscated at base, otherwise hyaline, cross band very 

 nearly attains the posterior margin ; the fourth posterior cell except 

 narrow apex, fifth posterior except at base and narrow apex and anal at 

 apex brown, abdomen dorsally with four longitudinal black stripes; 

 the two inner are pale on the first segment and the two outer on the 

 first and second segments; ventrally yellow, darkened at apex, and 

 on either side with two narrow dark lines abbreviated before. 



Male: Like the female except the second basal cell of the wing 

 has only the apical third hyaline. 



Habitat : Found in all sections of Ohio. 



This species is not likely to be confused with others of our 

 f nana except striatus, and from this it may be distinguished by 

 the yellow thoracic stripes, and yellow scutellum in both sexes. 



