136 ENTOMOLOGICAL NEWS. [October, 



The paper was discussed by Messrs. Fernovv. Riley, Schwarz, Howard 

 and Mann. 



In a paper entitled "Notes on Xyleborus," Mr. Schwarz commented 

 upon the discovery of a wild food-plant of Xyleborus dispar (pyri}. This 

 Scolytid had been found quite recently in the vicinity boring and oviposit- 

 ing in young shoots of Liriodendron tulipifentm. In the same branches 

 another species, X. tacliygraphns, was discovered, and Mr. Schwarz ex- 

 hibited and described its galleries. Discussion followed by Messrs. Riley, 

 Schwarz, Ashmead and Fernow. 



Mr. Howard read a paper entitled, " The Habits of Eurytoma," in which 

 he called attention to the fact that heretofore the generally-surmised para- 

 sitic habit of the members of this genus had never been conclusively 

 shown; and the close relationship of Eurytoma with the Phytophagic 

 genus Isosoma would lead to the inference that the former might be, in 

 part at least, inquilines-and riot true parasites. The following of a certain 

 species from the larval stage to the pupal, in which they were at once 

 recognized as a species of Eurytoma* settled in one instance at least the 

 question of larval habit. An Oak gall, Cynips Oiiercns-pnunis, was found, 

 on cutting it open May lyth, to contain six full grown parasitic larva;, af- 

 terwards determined as given above, and the remains of a larva which 

 they had nearly devoured. 

 The paper was discussed by Messrs. Riley, Howard and Ashmead. 



C. L. MARLATT, 



Recording Secretary. 



DESCRIPTION OF THE LARVA OF GORTVNA NITELA GUEN. AND ITS 

 VARIETY NEBRIS. Length full grown i^ inches. Uniform pale honey- 

 yellow. Head dark honey-yellow, shining, bearing a few scattered, erect 

 hairs. Mouth parts and a small spot on cheeks castaneous. Dorsal sur- 

 face of second segment pale brown, shining, shaded laterally with blackish 

 brown. Feet and stigmata black; segments three to eleven each with 

 four brownish gray spots on the dorsum, the anterior larger and closer 

 together than the posterior; each spot bearing a single erect hair; the 

 twelfth segment having four quadrate spots of the same color, larger than 

 the rest. A brownish gray spot just behind each stigma. Posterior seg- 

 ment slightly rugose, dark honey-yellow, margined with brownish black; 

 bases of anal prolegs pale brown. Feeds in the stems of the great rag 

 weed (Ambrosia trifida] and burdock (.-lir/iiim. fappa). The lame went 

 down July 3oth, and the images emerged August 2Sih. 



Two broods raised this season by my friend, P. Stephens, Montgomei \ 

 County, exhibit both forms about evenly divided. C. A. B. 



* The images obtained later proved to be Eurytoma prunicoln Walsh. 



ENTOMOLOGICAL NEWS for September was mailed August 28, 1890. 



