138 IOWA ACADEMY OF SCIENCES. 



Pterostigma indistinct: marginal cells less narrow, the first shorter and somewhat 

 smaller than the second: genital segment of female shorter than the rest 

 of the body; anal style of full-grown larva and pupa very short, nicked at 

 tip c.-gemma." 



Pterostigma distinct black, marginal cells less narrow, the first being shorter and 

 more nearly i V-shaped than the second; head and thorax black, marked with 

 yellow; antennae black; wings with a smoky band along the anal and apical 

 margins, and extending along the branching of the veins toward the base. Full- 

 grown larva and pupa larger than the preceding one, anal style moderately long 

 and notched at tip. (Galls oblong-oval, and are located in the twig or base of the 

 larger limbs, just beneath the bark) c.-inteneris, n. spj 



