160 



THOMAS SAY FOUNDATION 



Illinois, Fox River, June 25-27 ; Lake Forest, June 



24-27 (J. G. Needham) ; 111. River, Ottawa. 

 Iowa, Fairport, July, 1916. 

 Kansas, Baldwin, June (J. C. Bridwell) ; Riley Co., 



June 25 (Kimball) ; Miami Co., 1915 (R. H. 



Beamer) ; Lawrence, Douglas Co., June 21- 



August (P. W. Claassen). 



Genus ATOPERLA Banks. 



1905. Atoperla Banks, Psyche, 12:56. 

 1907. Atoperla Banks, Cat. Neurop., p. 12. 



Brown, slender stoneflies, 9 to 16 mm. in length ; 



with two ocelli about as far from each other as from the 



eyes ; f orewing with one to three crossveins between first 



and second anal veins. 



Head a little wider than 

 prothorax ; usually with an in- 

 f uscated or black squarish 

 mark enclosing the ocelli; two 

 ocelli, the anterior ocellus ab- 

 sent or sometimes indicated by 

 a small dot or depression. 

 Antennae brown, lighter at 

 base. 



Prothorax wider than long, 

 somewhat narrowed behind ; 

 brown; slightly rugose; legs 

 brown, first and second tarsal 

 segments very short, subequal, 

 third tarsal segment about 

 twice as long as one and two 

 combined. Wings subhyaline to 

 f umose ; usually no costal cross- 

 veins before end of subcosta; 

 and one to four costal cross- 

 veins beyond the end of sub- 

 costa; radial sector with two 

 branches beyond the cord ; one 

 to three crossveins between 

 first and second anal veins of 

 forewing; hind wing with a 

 large anal field and with two to 



Pig. i'i. Atoperla ephyre Newm. four cubital crossveins. 



