190 IOWA ACADEMY OF SCIENCES. 



• The adult female is about 7.50 mm. long by 2 mm. broad, with 

 a parabolically curved, thin edged vertex and a stout abdomen, 

 attenuating posteriorly and extending beyond the rounding 

 elytra. The males are smaller and have the vertex shorter 

 and more obtusely pointed. The abdomen is smaller and does 

 not extend beyond the narrow and nearly parallel margined 

 elytra. 



They are both of a uniformly deep green color above, some- 

 what lighter below, with a narrow band under the sharp ver- 

 tex, and the eyes dark; the exserted tip of the ovipositor, orange 

 red. 



The first brood of the adults appeared the first week in May 

 and remained until the middle of June, disappearing gradually. 

 They feed principally upon the leaves usually about the middle, 

 feeding on either side and either end up, with equal ease. 



The eggs are deposited during the last of May and the first 

 week in June. The females usually selecting a position just 

 above the first leaf base and invariably placing themselves 

 head downward, exsert the ovipositor and insert it under the 

 flap of the sheath, gradually working backwards up the stalk 

 for a distance of two inches or more and depositing from seventy 

 to one hundred and twenty eggs within an hour. 



The eggs are 1.25 mm. long by .25 mm. broad, cylindrical, of 

 nearly uniform size and obtusely pointed at both ends, arranged 

 in a single series, side by side, curving considerably around the 

 small stem. 



The larvae appeared the last week in June, giving an incuba- 

 tion period of fifteen to twenty days. Upon bursting the egg 

 case the larvas crawl part way out from under the sheath and 

 remain quiescent in this position for an hour or two when, 

 becoming suddenly active, a flock of very small larvae may be 

 seen ascending the stalk and distributing themselves upon the 

 leaves, while a row of freshly shed skins with the abdomens 

 still remaining under the sheath, their tips scarcely free from 

 the egg shells, explains the cause of the delay. 



When first hatched the larvce have a characteristic head, 

 depressed, light colored, soon deepening, however, and in some 

 assumes more or less definite stripes of darker which, in the 

 most extreme forms coalesce, and a black specimen is the result. 

 In normally colored specimens there is on either side of a median 

 light line a narrow black stripe originating in a spot on the 

 anterior margin of the vertex, obscured across the disk and 



