483 



the superiors with tuberculate lateral surfaces, the mesal margins with 

 two nearly equal teeth ; inferiors flat, placed horizontally, and slightly 

 swollen at the base and apex. 



Female. — Color similar to that of the male. 



Head similar to that of the male. 



Thorax without the black stripe on the metapleural suture, and 

 the mesinfraepisternum largely pale. 



Abdomen similar to that of the male except that the dorsal brown 

 stripes of the terga are more confined to the dorsal surface and the 

 lateral surfaces are mostly yellow or buff; ovipositor of the female 

 pale except the brown prostyles, extending caudad of the apex of seg- 

 ment ten; anal appendages of the usual type; dorsad of the superiors 

 and between them there is commonly an unpaired blunt process extend- 

 ing conspicuously beyond the apex of the tenth tergum. 



Measiiremeyits 



Length, $ 32-37 mm. 



Length, 9 35 mm. 



Length of abdomen, $ 25-30 mm. 



Length of abdomen, 9 27 mm. 



Length of hind wings, S 17-20 mm. 



Length of hind wings, 9 19 mm. 



"Width of hind wings, S 4-4.5 mm. 



Width of hind wings, 9 4.5 mm. 



There is great variation in the size of this species as well as in 

 its coloration. The black wash on the metapleural suture is a dis- 

 tinctive character of the older males, but the younger males and the 

 females are not easily separated from forcipatus and it is possible that 

 this species is a synonym of the latter. The nymphs are also reported 

 to be' nearly identical with forcipatus. 



Not common in Illinois though occurring in certain localities prob- 

 ably with forcipatus and rectangtdaris. 



Lestes eurinus Say • 



Nymph. — Not available for study. 



Adult; Male. — Color, metallic green and yellowish buff. 



Head metallic green; mouth-parts buff, the median lobes of the 

 labium subquadrangular, with a shallow cleft and a dark line extend- 

 ing proximad to the base; distal segment of the labial palpus dark 

 brown, shorter than the fixed hook; antennae uniform dark brown, the 



