OSBORN AND BALL STUDIES OF NORTH AMERICAN JASSOIDEA. 9 I 



Athysanus curtisii Fitch. (Plate V., Fig. i.) 



The life history of this species was outlined in the Life Histories of 

 JassidcB (Proc. la. Acad. Sci., IV., p. 221), but the figures presented 

 at this time will be of service in comparing the different species. 



Athysanus bicolor Van D. (Plate V., Fig. 2.) 



The life history of this species has also been discussed with that of 

 the preceding species, but some details of life history remain to be de- 

 ternnned. The figures will serve for comparison with related forms. 



Athysanus striatulus Fall. (Plate V., Fig. 3 ) 



A rather slender species with long wings reaching well beyond the 

 abdomen, about one-sixth of an inch to the tip of the wing in the fe- 

 male, the male being shorter and much smaller, testaceous-brown with 

 dark markings on pronotum and wings, head shorter than pronotum, 

 markings arranged in about three interrupted row.s, sometimes ob- 

 scure. 



The larvse are narrow l)rownish forms with a slightly more pointed 

 head than tiie adult, the dark markings are nearer the margin except 

 two spots near the base; there is a row of spots across the pronotum, 

 two jair of large spots on the wing-pads and a smaller pair between 

 the |x)sterior ones. 



'I'his species is found abundantly over the prairie grass areas in dif- 

 ferent parts of the state. The larvae were found very common the last 

 of May and on into June. The males began to appear by the middle 

 and the females a week later ; the males disappeared by the second 

 week in July, the females remaining until into .\ugust, the eggs hav- 

 ing been deposited before the end of Jul v. 



Athysanus striola Fall. (Plate V., Fig. 4.) 



This species somewhat resembles the preceding in size and the stri- 

 ations of the head, but is otherwise quite distinct. The head is much 

 broader than the body, which tapers back to the narrow tip of the 

 wings. 



Color: Green tinged with yellow, a narrow black line across the 

 head between the ocelli and the margin black, sometimes a curved line 

 on the pronotum dusky. 



