1922.] 183 



seen in portions of two small branches of aspen (presented to the 

 Museum by Mr. Marriott), both excavated by *S'. populnea ; these 

 have been pared away on one side to show the borings, and in each 

 specimen there is an empty puparium of B. in'orata blocking the 

 tunnel. The writer is informed by his colleague Mr. F. Laing that, in 

 the summer of 1921, he found B. irrorata puparia in numbers in the 

 neighbourhood of Oxshott and Leatherhead, Surre}', in aspen branches 

 attacked by Saperda, but that a whole afternoon's investigation of 

 aspen trees on Stanmore Common, Middlesex, where *S'. jjopulnea is 

 abundant, failed to yield any evidence of the presence of the fly. It 

 would therefore seem that the latter may be somewhat local in its dis- 

 tribution, and that it does not necessarily occur wherever its host is 

 met with. 



As regards the appearance of B. irrorata, it ma}^ be noted that, in 

 the female sex at any rate, the fly shows a certain general resemblance 

 to a smallish Sareopluufa, and that, though the face exhibits little or no 

 trace of a keel, the arista is conspicuously plumose. 



Onesia germanorum Villen. — Of this species, which in its general 

 fades presents a deceptive resemblance to a Galliphora, and was 

 described fifteen years ago [c/*. Villeneuve, Ann. Soc. Ent. France, 

 Ixxvi, p. 398 (1907)] from sjiecimens from Prussia, the British Museum 

 (Natural History) possesses one male and four females, taken at Neth}" 

 Bridge, Inverness-shire, 29-30. vii. 1911, by Lt. -Colonel J. W. Yerbury, 

 by whom they were presented. 



British Museum (Natural History), 

 Cromwell Road, London, S.W. 7. 

 July 17 th, 1922. 



A CECroOMYID, PERRISIA HARRI80NL nom. nov. 

 BY RICHARD S. BAGNALL, F.R.S.E., F.L.S. 



In 191J, Eiibsaamen ('• Marcellia," xiv, p. 107) described a species 

 of Cecidomyid under the name Dasyneura jaapiana, the yellow larvae 

 of which are to be found in a '• leaf -pod " gall on Medicago hipulina 

 (Houard, No. 3509, and Bagnall & Harrison, No. 158). 



Overlooking this, he later described another species of the same 

 genus under the same name, this latter having a red larva affecting 

 Spiraea nlmaria {JJlmari(( peiitapetaJa^, and, in changing the name. 



