160 THE CANADIAN ENTOMOLOGIST. 



October, or somewhat earlier. It is possible that the brown or reddish 

 halo around the galls appears only later, after the larva has left the gall ; 

 at least the only gall containing a larva had no halo. The larva and its 

 breast-bone agree with the Baron's description. But I was very much 

 interested to find in the body of the larva two large eggs, with an embryo 

 similar to those described for Miastor. We may conclude therefore that 

 C. liriodendri also can be propagated by the larva. Perhaps the very 

 numerous galls found often on the same leaf, of different sizes, may be the 

 results of this kind of propagation. 



In comparing the galls in the collection, I found very similar ones on 

 Fraxinus aniericana ( C. pellex O. S.), on Quercus tinctoria (C. sym- 

 metrica O. S.), on Carya (C. caryce-lamina Walsh, and C. gluti?io$a 

 O. S.), and on Tilia americaiia (C. verruricola O. S., Can. Ent., 1875, p. 

 201). Osten Sacken, 1. c. p. 202, speaks of similar spots on the leaves 

 of the Tulip-tree produced by a Lepidopterous larva. I presume they 

 are made by Nepticula or by Phylocnistis. 



Of the 32 species of Cecidomyia galls described in Monograph, Vol. 

 I,, p. 190-205, besides the two from the Tulip-tree, 4 are not in his col- 

 lection, C. cynipsea from hickory, C. eriibescens from oak, C. impatiefitis 

 from Impatiens fulva, and C. agrostis from Agrostis. 



CORRESPONDENCE. 



A CORRECTION. 



JDear Sir : I wish to correct the statement made by me on p. 13 of 

 the present volume of this journal, in regard to a pupa of Elaphidion 

 paralleluffi Newm. being found inclosed in a silken cocoon. The cocoon 

 in question was undoubtedly that of a parasite. 



C. H. T. TowNSEND, Constantine, Mich. 



Dear Sir : In the article on explosive emissions from Carabidae, June 

 No. Can. Ent., I notice that the genus Harpalus is not included. While 

 collecting in Conn, about a year ago, I took H. caliginosus in large num- 

 bers on the flowers of the rag-weed. Several filled my cyanide bottle with 

 a dense white smoke. I noticed no explosions outside of the bottle. 



Geo. F. Cuktiss, Lynn, Mass. 



