OF WASHINGTON. 233 



was a keen observer, a careful recorder, a close student of nature, 

 and that the work he did in his day along entomological lines, 

 alone and unaided, entitles him to a prominent place with the 

 early economic entomologists of this country. 



In this connection, Mr. Johnson exhibited three photographs 

 of Mr. Trimble taken at different ages, and a large series of 

 unpublished plates prepared, under Trimble's direction, for the 

 second volume of his work on fruit insects. The plates excited 

 considerable interest from their excellence. 



Mr. Schwarz pointed out that some manuscript determinations 

 on the margins of the plates were in the handwriting of the late 

 Professor Riley, and placed the date at which the notes were 

 made at some time between 1872 and 1875. Mr. Schwarz 

 further stated that most of the figures of insects, while carefully 

 drawn, did not possess the characteristic appearance which the 

 Germans call " Habitus." 



Mr. Ashmead called attention to the fact that a special effort 

 had been made by Dr. Trimble to have the natural enemies of 

 the injurious insects figured. He said that he could at once 

 name several of the parasites from the figures. There was some 

 doubt as to the date of the preparation of the plates, and Mr. 

 Schwarz pointed out that Lema trilineata was figured as " the 

 potato-beetle," showing that the plate must have been prepared 

 before the eastern advent of the Colorado potato-beetle that is, 

 prior to 1871. 



Dr. Dyar presented the following note : 



NOTE ON AN EXTERNAL FEEDING HYMENOPTEROUS 

 PARASITE. 



By HARRISON G. DYAR, Ph. D. 



The larva of a nematine saw-fly occurs commonly on the black 

 oak on Long Island, N. Y., in June (larva marked 8 H in my 

 notes*) . They normally rest on the edge of the leaf, feeding almost 

 continuously, and move the abdomen somewhat actively if dis 

 turbed. A few were found in an entirely abnormal position, hold 

 ing on firmly to a rib on the back of the leaf, the abdomen hang 

 ing down flaccid. They were quite paralyzed, the dorsal vessel 



* The flies proved to be Numatus chlorcus Nort. The larva is de 

 scribed in Journ. N. Y. Ent. Soc., VI, 123. 



