﻿278 THE ENTOMOLOGIST. 



cilia is a dark, almost black line ; the fringes themselves are 

 cream-coloured ; the hind wings are whitish, but ferruginous 

 towards the hind-margin, especially near the apex. Abdomen 

 and antennae long. Sexes very much alike" (Knaggs). 



Introduced by Mr. Stainton, December, 1867. 



English Locality. — Cheshunt. 



Distribution. — South Western Europe; Syria; Bengal; 

 England. 



Note. — Dr. Knaggs says this species had been previously 

 reputed British, but this was a mistake, and arose from the fact 

 that catalaunalis was supposed to be synonymous with Nascia 

 cilialis, Hiibn. 



(To be continued.) 



NOTES on SOME SPECIES of GALL-GNATS (CECLDOMYLE). 

 By T. D. A. Cockerell. 



12 3 



<y Genitalia op Cecidomyia (all enlarged). 

 1. C.s-batatas, $ forceps. 2. G.frater, £ forceps. 3. C.s-brassicoides, $• forceps. 



While living in Colorado I was able to breed several of the 

 species of gall-gnats found in that state, but could never work 

 out their nomenclature in a satisfactory way, not having access 

 to sufficient of the literature of the subject. Now, however, I 

 have been able to make the proper enquiries and comparisons, 

 and present some of the results herewith. 



The galls produced by the species of Cecidomyia are very 

 various in form, and of great interest from several points of view. 

 They are also, as a rule, not difficult to identify. The gall- 

 makers, on the other hand, are often very closely allied, and 

 exceedingly hard to name even when alive ; dead specimens 

 become so shrivelled as to become almost useless unless some- 

 thing is known of their life-history. Probably nearly all the 

 species which have been described by Walker and others, from 

 dead specimens which have no history, will have to be put aside 

 as unrecognisable. 



Cecidomyia rigid;e, Osten-Sacken. 

 — salicis, Fitch, non Schr. = salicis-siliqua, Walsh (var.). 

 Gall. — A red fusiform swelling on the twigs of Salix, tapering at either 

 end, and often emitting one or more small twigs. These galls are smooth 



