May, '06] entomological news,. 175 



ficient constancy to divide the family into two subfamilies, but 

 I think it may well be used as of generic value to divide the 

 Chloroperla of authors into two genera. I therefore do so, 

 using the name Isoperla for those forms having the median 

 vein extending basally parallel to the radius, and Alloperla for 

 those forms having the median united to the radius at base. 

 The Perla bilineata Say, will be the type of Isoperla, which 

 includes also tra?is?nari?ia Newm., montana Bks. , 5 -pwictata 

 Bks. , brunneipennis Walsh, and decolorata Walk. The Perla 

 imbecilla Say, will be the type of Alloperla, which includes 

 also coloradensis Bks, paciHca Bks., signata Bks., borealis Bks. , 

 brevis Bks., minuta Bks., marginata Bks., and pallidula Bks. 

 Alloperla differs chiefly from Chloroperla (fsopteryx) by having 

 a folded anal space to the hind wings. 



Notes on Papilio ajax. 

 By R. R. Rowley, Louisiana, Mo. 



It is not the writer's intention in this paper to tire his 

 readers with a lengthy description of the stages of larval 

 growth, since these have been carefully worked out by others 

 and the results published, but to record his observations on 

 the habits of the larva and the imago, with the hope that 

 young collectors at least may gather some inspiration from 

 these notes. 



Wherever papaw grows there ajax is usually abundant 

 throughout much of the summer months and from late May 

 to mid-September this fine swallow-tail may be seen flitting 

 aimlessly though the bushes, rarely stopping for a moment. 



Even when very abundant, it is not easy to take this " fly," 

 and nine out of every ten are so injured as to be worthless for 

 cabinet purposes. So fragile are the wing tails that they are 

 often broken in the meshes of the net. 



In June of 1900, a veritable ajax year, I took a great num- 

 ber of these butterflies by decoys. A few ragged specimens 

 taken on the wing were killed and spread upon the ground 

 and leaves of low bushes along a path through the papaw 

 patch where they could be seen by the stream of flitting "flies" 

 above. 



