IOWA ACADEMY OP SCIENCES. 181 



Larvae were found June 16th, small to half grown, continuing 

 abundant until the middle of July. Adults appeared about the 

 first of July, continuing till the middle of August. Second 

 brood larvae occurred into the latter part of August, and on 

 through September. Adults appeared in September and 

 October. 



This is by far the most abundant species of the genus, and 

 occurs throughout the entire region east of the Rocky moun- 

 tains from Canada to Texas, at least, and is closely related to 

 the South American lineata of Burmeister, if not identical 

 with it. 



In common with other jassids which have a wide distribu- 

 tion, it does not seem to be confined to any particular food plant, 

 but may be found almost everywhere, preferring rank growths 

 in shaded situations. It is the only representative of the retic- 

 ulated elytral group occurring at Ames, and is unique in that 

 it is two-brooded, while the other species are all apparently only 

 single-brooded. 



GYPONA BIPUNCTULATA WOOD. 



Oyponabipunctulata, Woodworth, Bull. 111. State Lab. Nat. Hist., Ill, p. 30, 1887.( 9 ) 

 Oypona nigra, Woodworth, Bull. 111. State Lab. Nat. Hist., Ill, p. 31, 1S87 ( J' ) 



This is the largest jassid known to occur on grasses in Iowa, 

 and presents a very marked difference between the males and 

 females. The females described as bipunctulata by Woodworth 

 are bright green, stout, deep -bodied. The vertex is short, ocelli 

 small, and there are distinct black dots on the pronotum, one 

 each side about half way from the middle to the margin; also a 

 distinct dot on the base of each elytron just under the outer 

 angle of the pronotum. 



The male, which was described as Gypona nigra by Wood- 

 worth, has the head and pronotum black, margined with light 

 green. The black color nearly conceals the dots of female pro- 

 notum. The elytra are hyaline and allow the black tergum to 

 show through, so in most specimens there is usually a quite 

 uniform dark color to the whole upper surface except the 

 margin. The genital plates are broad, shorter than sixth seg- 

 ment, truncate at apex. 



Woodworth described this species from Illinois, and we have 

 specimens from Kansas aside from numerous examples taken 

 in Iowa. 



The adults appear the middle of July, the males about a 

 week before the females, and continue to the latter part of 

 September. They have been taken only from grasses. 



