96 



PSYCHE. 



[August, 1900. 



Mr. S. H. Sciidder said he had completed a 

 new list of New England Orthopteia for pub- 

 lication in Psyche, extending to very nearlj 

 one hundred species. The list of 1S62 con- 

 tained seventy-eight species, and the names 

 then used were now changed in about three 

 quarters of the instances. 



Mr. W. L. Tower said he had studied the 

 development of the wings in Leptinotarsa 

 (Doryphora) lo-lineata, Say. The elytra 

 and hind wings arise in exactly the same 

 way and at the same time, in the first lar- 

 val stage. The ectoderm of the body wall 

 thickens, and invaginates; then the dorsal 

 part of the invagination becomes thickened 

 and is evaginated as the fundament of the 



wing into the cavity of the first invagination, 

 which now becomes a peripodal sac. The 

 wings develop parallel throughout the larval 

 life. The elytra do not begin to become 

 modified until the pro-pupa stages are 

 reached. The wings become external by the 

 withdrawal of the peripodal sac. 



In the second larval stage a transient tra- 

 cheal system enters each wing, and in the 

 third stage six principal tracheal trunks enter 

 each wing. Just before pupation the vena- 

 tion of the wings, which is indicated by the 

 trachea, are almost identical. In this beetle I 

 regard the elytra as true ^vings and not as 

 divergent specialized structures as Kriigel 

 (1899) claims them to be. 



A. SMITH & SONS, 146-148 WILLIAM ST., New York. 



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