March, 1904.] ^g 



HELP-NOTES TOWAEDS THE DETERMINATION OF BRITISH 

 TENTHREDINID.E, &c. (8). 



BY THE KEV. P. D. MORICE, M.A., A\-P.E.S. 



TRICHIOSOMA AND ABIA. 

 My last paper has brought me some interesting correspondence. 

 From the Rev. E. N. Bloomfield I learn that On/ssus ahietinus as a 

 British insect does not rest solely on Stephens's records, but was taken 

 near Hastings about 20 years ago by Mr. E. Collett and given to Mr. 

 T. E. Billups ; I mu?t therefore withdraw my proposal to omit it from 

 our List, though, like so many of our specimens of the Siricidce, it is 

 probably rather a chance visitor than an indigenous insect. I hear 

 also from Mr. C. W. Dale that Xipliydria camelus has been recorded 

 from the New Forest (Entomologist, vol. xxxiv, p. 54), and that Xyela 

 is attached to the birch. Lastly, IMr. Eignell writes that the speci- 

 mens of Sirex which he had as juvencus prove to belong really to 

 noctilio. (If any collector has a British specimen corresponding to 

 true juvencus as described in my last paper, I should be exceedingly 

 grateful for a sight of it). It should perhaps have been said that 

 some authorities regard nocfiUo ai)d juvencus as a single species, but 

 Thomson and Konow both look on them as certainly distinct, and Mr. 

 Cameron, though expressing some doubt on the matter, keeps them 

 apart in his Monograph. 



Immediately after the Siricidcd in my Table of the British 

 genera follows Cinihex. But, partly from lack of material, and partly 

 in expectation of the result of certain investigations now being made 

 by Herr Konow, I prefer to say nothing at present about our species 

 of Cimhex ; and, as this does not claim to be a systematic Monograph, 

 I shall venture to postpone consideration of that genus, and pass on 

 at once to Tricliiosoma and Abia. 



(1) Of Trichiosoma I know four British species, which appear to be 

 the four described by Mr. Cameron ; but, according to Konow's views, 

 lucorum is the only one correctly identified in the Monograph. Betu- 

 leti, Cam. {nee King), is tibialis, Steph. Scalesii, Cam. (which is not 

 sorhi, Htg., and is attached not to Sorbus but to Salix) is latreillei. 

 Leach. Vitellincd, Cam. {nee Linne) is silvatica, Leach. 



Of these species tibialis belongs to the hawthorn, lucorum to the 

 birch, and latreillei and silvatica to the willow. To remember this 

 may be useful to collectors, for the external characters which distin- 

 guish the species are slight and somewhat troublesome to recognise. 



