NORTH AMERICAN SAWFLIES OF THE SUBFAMILY 

 CLADIINAE.^ 



By S. A. RoHWER, 



Honorary Custodian of Hi/menoptera, United States National Museum. 



WITH 



NOTES ON HABITS AND DESCRIPTIONS OF LARVAE. 



By Wtlliam Middleton, 

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



INTRODUCTION. 



The adult sawflies of the subfamily Cladiinae are, with one or two 

 striking exceptions, rather small, black, and inconspicuous insects 

 which attract the attention of few people other than the specialist. 



The larva of most of the species are also rare and seldom seen. 

 Two of our American species, are, however, conspicuous; one {Trich- 

 wcampiis viminalis) because of the coloring of the adult and feeding 

 habit of the larva, the other {Cladius isomerus) because the larva is 

 the commonest defoliator of roses in the eastern states. The follow- 

 ing paper, which is a contribution from the Branch of Forest In- 

 sects, Bureau of Entomologj^, contains a revision of the adults and 

 descriptive notes for the known larvae as well as some observations 

 on the habits of certain species. The work on the adults has been 

 done by Mr. Rohwer and the new species should be accredited to him, 

 while the work on the larvae was done by Mr. Middleton. The bio- 

 logical work and rearing was done at the Eastern Field Station of 

 the Bureau of Entomology (Forest Insects), located at East Falls 

 Church, Virginia. 



^ Since this paper was submitted MacGillivray has published descriptions of seven new 

 species of North American sawflies of this group. See " New Species of Cladiinae — 

 Hymenoptera," Ent. News, vol. 32, no. 2, 1921, p. 48-50. I have studied these descrip- 

 tions but have been unable to satisfy myself that any of the forms characterized are the 

 same as the new species described in the present paper. Because of the different inter- 

 pretations of generic limits it is also impossible to be certain that the generic assignment 

 of Dr. ]\IacGillivray is the same as that here used, and judgin-? from the descriptions alone 

 it would seem that certain species placed in Trichiocampus would, according to the char- 

 acters, ^ere used, be placed in Priophorus. (See p. 4.) S. A. Rohwek. 



No. 2396.— Proceedings U. S. National P/sUseum, Vol. 60. Art. I. 



