JOURNAL OF ENTOMOLOGY AND ZOOLOGY 173 



Lasioplcrci solidctyims O. S., determined by Dr. E. P. Felt, who 

 states that it is a rather common form about New York City, 

 Albany, Worcester, Mass., and Boscawen, \. J., wintering 

 normally in the gall, the midges appearing in the spring. 

 There is probably but one generation. It happens that a num- 

 ber of the Lasopteraris live in the subcortical tissues, which 

 must be firm at the time of oviposition. 

 Pach\ophthalmiis siyuatiis Meigen, reared from a pupa found in 

 the central cavity of a gall which had no hole on its surface. 

 It was determined by Mr. Walton, who states that it is para- 

 sitic on the mud wasps ( Trypacylon poUtiun Say and Pelopaeus 

 ccmetarius) . 

 Gch'chid sp., reared from a pupa found in the gall which had no 



hole on its surface. It was determined by Mr. Busck. 

 Tortricid larva, found in the common parenchyma of a young 

 gall and determined by Mr. Busck, who states that it is a 

 borer, boring up the stem into the gall. 

 Hydnocera larva found in the common parenchyma of a mature 

 gall and determined by Mr. H. S. Barber. This is probably 

 one of the wood-boring species of CUnid^e and predaceous in 

 both larval and adult stages. The larva enters the home of 

 its prey to feed on the early stage. 

 Idolothrips annatus Hood, a number of nymphs found in a 

 deserted gall. This gall was decaying. They were deter- 

 mined by Mr. Hood. 



SUMMARY 



1. The round gall of the Canada goldenrod is found in abun- 

 dance on stems that grow in open moist ground. They are caused 

 by the larva of the fly Eurosta solid^ginis Fitch. They are ten- 

 anted also by the larva of the beetle, MordelUstina unkolor Lee, 

 and by parasites of both fly and beetle. After the emergence of 

 these the empty galls afford shelter to a number of chance visitors. 



2. The galls vary from 16 to 36 mm. in length and from 9 to 

 29 mm. in width. 



