A CONTEIBUTIOX TOWARD THE CLxlSSIFICATION OF 

 THE WEEVIL LARVAE OF THE SUBFAMILY CALEN- 

 DRINAE, OCCURRING IN NORTH AMERICA. 



By Richard T. Cotton, 

 Of the Bureau of Entomology, United States Department of Agriculture. 



INTRODUCTION. 



Until quite recently the larvae of the family Curculionidae have 

 received little attention from taxonomic workers in entomology. 

 Numerous descriptions of economic forms have appeared from time 

 to time but for the most part they are so vague and fragmentary as 

 to be useless for purposes of identification. In recent years Hopkins, 

 Boving, Grandi, Tragardh, Donisthorpe, Pierce, and others have 

 published detailed descriptions of certain economic forms, which 

 will serve as a basis for future study of this most interesting group 

 of larvae. 



Several years ago the writer became interested in the study of the 

 larvae of the family Curculionidae, particularly those belonging to 

 the subfamily Calendrinae, and as opportunity offered, studies were 

 made of the different forms of this group. The writer is ver}'^ much 

 indebted to Dr. A. G. Boving for his constant help and advice in the 

 preparation of this paper. Through the kindness of Dr. L, 6. 

 Howard the collection of Calendrine larvae belonging to the United 

 States National Museum was made available for study and made 

 possible the completion of the work. The writer is also indebted 

 to A. F. Satterthwait for the loan of his collection of larvae of the: 

 genus Calendra. 



SUBFAMILY CALENDRINAE IN NORTH AMERICA. 



The subfamily Calendrinae is represented in North America by 

 eleven genera and about ninety species. Of the ninety known species 

 more than two-thirds belong to the genus Calendra {Sphenophoi^s) . 



The following classification deals only with generic characters and 

 is based on a study of the larvae of all the genera of this subfamily 



No. 2542.— Proceedings U. S. National Museum, Vol. 66. Art. 5. 



94987—24 1 -^ 



