] 36 [June. 



of Ctenoplwra, if CfenopJiora and Tanyptera are kept apart as distinct 



genera. In 1832, Brulle, overlooking Latreille's work, also founded a 



new genus (Xiphvra) onatrata, and in 1833 he separated Cf. himaculata, 



L., as a distinct genus, Dictenidia, leaving Meigen's two remaining 



speciesin Gtenophora, where they have peacefully stood until Coquillett's 



unwai-ranted innovation. What Latreille, five years later (in 1910), did 



with the genus Gtenophora has no bearing on our nomenclature. 



Kertesz's citation (Cat. Dipt. II, p. 269) of Tanyptera under the genus 



Cfenophora is wrong. The correct synonymy of these genera is : — 



Tanyptera, Latr. (1805). Ctenophoka, Meig. (1803). 



Xiphura, Brulle (1832). Phoroctenia, Coq. (1910). 



Type: atrata, L. Type: pectiiiicornis, L. 



Tiirtola, Finland: 



A^ril, 1912. 



TWO DIPTERA (CECIBOMYIIDM) NEW TO BRITAIN. 

 BY p. W. EDWARDS, B.A., F.E.S. 



{Published by lierniission of the Trustees of the British Museum.) 



1. Oligotroph'iis ventricolus, Eiibs., Biol. Centr. XIX, p. 566 (1899). 



In December last I received for identification from Mr. H. Hors- 

 fall, of Springhead, Oldham, Lanes., some Cecidomyiid galls on 

 Molinia coerulea, together with one damaged fly bred from them. The 

 galls and the larvae contained in them were evidently those described 

 and figured by Riibsaamen (Ent. Nachr., XXI, 1895, p. 13) and by 

 KiefEer (Ann. Soc. Ent. France, 1900, pi. 31, fig. 9) ; thelarvse corres- 

 ponded exactly with Riibsaamen' s description, and as he says that they 

 are " distinguished from all known Cecidomyiid larvae by the presence 

 of a chitinous structure on the fourth segment" (i.e. the one behind 

 that bearing the " brustgrate ") the identification seemed indisputable. 

 Riibsaamen' s subsequent description of the imago, however, did not 

 seem to fit Mr. Horsf all's specimen. I was, therefore, very glad to 

 receive from my correspondent, on April 2nd last, a nmnber of living 

 examples of the fly bred from the MoUma-gaMs. An examination of 

 these proved that they were certainly 0. ventricolus, and that the 

 species is subject to a good deal of variation in size and colour. 

 According to the original description there is a red stripe on the side 

 of the thorax extendmg from the wing-base to the neck. One or two of. 

 the score of specimens I examined were coloured thus, but most had 



