mens of Harris's species with the European Cladkisjyectinicornis Fonrcr.* 

 proves tlie two species to be identical. The latter differs iu fact in no 

 -important feature from, and has recorded of it the same larval charac- 

 teristics and habits, as the American species. The old name isomera of 

 Harris must give place to the name given by Fourcroy at a nuich earlier 

 date. The introduction of this common European i)est of the Eose 

 doubtless took place at an early period. The hibernating larva? at the 

 base of the plants, or attached to the stems in their parchment-hke 

 cocoons, afford an easy method of introduction, and it would indeed 

 have been remarkable if such introduction had not resulted. 



Since the first discovery of the larva? in 1880 the insect has persisted 

 on my rose-bushes, and seems to have steadily increased in the city of 

 Washington. It has also been found in other parts of the country. Its 

 wide distribution and its rose-feeding habit are shown by the following 

 records : 



4'H^^ 





■^i) 



Fig. 2. — Cladius pectinicornis : a, egg; 6, portion of leaf showing egga in t,itu and work of young 

 larvaj ; c, newly-hatclied larvoe ; d and c, lateral and dorsal aspect of middle segment of same ; /, larval 

 claw ; g, rose leaf showing nature of defoliation ; all except g enlarged (original) . 



In May, 1886, a female of this species was discovered by Mr. F. M. 

 Webster, at La Fayette, Ind., just in the act of oviposition, and iu 

 September, 1887, the larvae were observed on some roses at Eichfleld 

 Springs, I^. Y.; while in the fall of 1889 Miss Murtfeldt found the 

 larv?e at Kirkwood, Mo., and gave in Bulletin 22 of this Division a brief 

 account of their liabits. 



Its mode of work is quite unlike that of the common Rose Saw-fly 

 {Monostegia rosce). Instead of feeding like that species, during its 

 whole larval existence, exclusively upon the upper epidermis of the 

 leaves, these larvjie while quite small feed upon the lower side only. 

 Gradually, however, as they l)ecome larger, they eat irregular holes all 



'Ent.,Par.ii, p. 374 (1788). 



