104 [May. 



Aspidiotus bavaricus is known, as I could not get any material, and 

 Newstead's reference is too short for the certain determination of the 

 new species. A few weeks ago, however, I found several ? ? of 

 A. bavaricus on Gallvna vnhjaris from Chester, and recently on the 

 same plant from Aberdeen, Scotland, so that-i.here is no longer any 

 doubt of its occurrence in Britain. 



Ai^pidiofus bavaricus is apparently a very oM and well-established 

 species. It is highly improbable that it could have been introduced 

 into England from the continent with its food-plant, for no one would 

 take the trouble to introduce a plant already present in such abundance ; 

 so the only conclusion possible is that both scale-insect and food-plant 

 have been present in England ever since the separation of the latter 

 from the mainland. Since that time A. bavaricus has not changed in 

 the very least, for the examples from England differ in no way from 

 those from Norway, Germany, the Riviera, or from those taken on 

 Erica arborea in Corsica. In their habits only, is a slight difference 

 recognisable between northern and southern examples, for in Mid and 

 Noilh Europe the insect is mostly to be found on the more or less 

 subterranean parts of the stem of the food-plant, whilst in Corsica it 

 takes full possession of the aerial stems. 



Hamburg : 



March 2Uh, 1913. 



THIRTY ADDITIONS TO THE LIST OF BRITISH DIPTEBA. 

 BY J. E. COLLIN, F.Z.S., F.E.S. 



Amongst the nmnerous species of Diptiera occurring in Britain 

 but not yet included in the British List the following thirty may be 

 recorded now with some degree of confidence. 



EMPID^. 



1. Cyrtoma interw,edia, Lundbk. This species which was described 

 by Limdbeck in his " Diptera Danica, Part III," is not uncommon in 

 Britain in various localities, from the New Forest (Hants) to Aviemore 

 and Nethy Bridge (Inverness). The late Mr. Verrall had separated 

 it mider the M.S. name of nigrescens, but I have satisfied myself by 

 correspondence with Mr. Lundbeck that our species is the same as his. 



2. Cyrtoma pilosa, Lundbk. This is another Danish species which 

 is comparatively common in Britain and which may be distinguished 

 at once by the much longer pubescence on thorax or legs. It occurs 

 from Sussex to Sutherland. 



