318 Prof. West wood on the supposed abnormal 



long ago as 1867 I published, in the ' Canada Farmer ' 

 for that year (pp. 267-8), a short article acknowledging 

 my error (as given to the world in the ' Practical Ento- 

 mologist ' i., pp. 10 — 12 and 37, 38) in disputing the con- 

 clusions at which Harris and Fitch had many years 

 before arrived, namely, that the joint-worm fly is the real 

 author of the joint-worm galls. In this same article will 

 also be found the following passage, in regard to the 

 generic determination of this insect : — " The joint- worm 

 fly differs generically from all the numerous species of 

 the Enrytouia group which I have ascertained to be para- 

 sitic on other insects, and cannot, I think, be referred 

 with any propriety to the genus Eiirytoma, although it 

 undoubtedly belongs to the Eur/jtoma group . " " Certainly, 

 if preceding authors had referred this species to its 

 proper genus, I should not have been so unwilling to 

 believe in its being a true vegetable feeder. As soon as 

 I became acquainted with it the mystery was solved at 

 once." — 'American Entomologist,' p. 329. 



Mr. Walsh then discusses the question of the specific 

 identity of the specimens of /. hordei reared from wheat, 

 rye, and barley, and insists that Fitch's four species, 

 founded on the different food-plant and colour of the legs 

 of the individuals, can only be considered as varieties of 

 one species. 



No other species of Isosoma is described by Mr. Walsh. 



In the second of Mr. Walsh's memoirs the genera 

 Eurytoma, Decatoma, and Isosoma were adopted. In 

 Eiirytoma (with 8-jointed male and 8-jointed female 

 antennae, not counting the minute annulus or annuli 

 between the 2nd and 3rd joints, or any apparent articu- 

 lation in the terminal joint or clava), eight species were 

 described, including the E. studiosa, Say, the remainder 

 being new species. 



1. E. hicolor, W., p. 298. Reared from rough, woody, 

 subglobular, black, fungoid swellings upon the twigs of 

 black oak infested by an undescribed species of gall-fly. 



2. E. prnnicola, W., p. 298. Bred from oak-galls of 

 Cynips Quereus prunus, Walsh. 



Var. E. glohulicola. Bred from the Cynipideous oak- 

 gall, Cynips Q. glohalus, Fitch. 



3. E. auriceps, W., p. 299. Bred from the Cynipideous 

 oak-gall of Quereus erinaceus, Walsh (= Q. pisum, 

 Fitch ?) ; also from galls of Q. spongifica, 0. S., and 

 Q. hirta, Bassett, with a single female from the Cyni- 

 pideous rose-gall, radicaiu. 0. S. 



