TABANID.^ OF OHIO. 39 



Habitat: Taken in CentrarOhio. 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 vv^here 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 callosity black ; thorax dorsally with two greenish 

 gray 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 

 species from others, and also to associate the sexes which are 

 strikingly different in coloration. 



I have observed the females ovipositing on foliage overhang- 

 ing a mill race at Georges ville, Ohio, June 4, 1899. 



