1910.] 9 



British Tineidse. in tlie shape of Cemiostoma susinella, H.-S. Of this 

 species I secured two most beautiful individuals amongst its food- 

 plant, aspen, at Avieinore, Inverness- shire, the first being taken on 

 June 17th last, and the other two days later. A comparison of these 

 with the notices by Herrich-Schaft'er in Schmet. Exu-., v, 342 (1855), 

 and by Stainton in Nat. Hist. Tin., i, 288—289 (1855), and with the tine 

 and lengthy series in the Stainton continental collection, has estab- 

 hshed their identity beyond all question. The insect was remarkably 

 scarce, and exceedingly difficult to captiu-e, for the aspen bushes, in the 

 very restricted spot where it occurred, were growing crowded amongst 

 a numljer of young birches which rendered the use of the net either 

 difficult or impossible. My two specimens were, to the best of my 

 belief, the only ones that I saw, but on one occasion my wife, when 

 collecting among these same bushes, noticed just a few minute white 

 moths, which, although they were not secured, can only have been 

 susinella, for, in spite of constant work in that spot, no insect that 

 could possibly be mistaken for it has been met with there. 



SHslnella is referable to that section of the genus Cemiostoma 

 whereof the members have white fore-wings. It may, however, be 

 readily distinguished from all its congeners by the characteristics 

 mentioned in the following description published Ijy Stainton (loc. 

 cit.) : — " Anterior wings white, with a pale yellow spot on the costa 

 beyond the middle, continued to the anal angle, and a second spot 

 before the apex ; a black spot with a violet pupil above the anal angle, 

 and two fuscous streaks in the cilia pointing iipwards." In my 

 Aviemore specimens, which show an alar. exp. of 6' 75 mm., the 

 markings of the fore- wing are stronger in colour, and consequently 

 more conspicuous, than in Stainton' s continental exponents, the first 

 yellow costal spot being very distinctly margined on both sides, and 

 tine, second on its anterior side, with dark fuscous. 



On the continent, and presumably in Britain also, susinella is 

 double-brooded, the imagines of the first generation appearing in Jime, 

 and those of the second in August. The larva mines the leaves of 

 Pojndus tremida (aspen) in July, and again in September. 



In Stgr. & Rbl., Cat., ii, p. 218, No. 4227 (1901), Rebel gives the 

 species imder notice as occiu-ring in Central Europe (except England*), 

 Northern and Western Russia, Sweden, and Mauretania (teste Mey- 

 rick) . 



Norden, Corfe Castle : 



November 6th, 1909. 



* Instead of "Angl.," Rebel should have written "Brit.," which, as explained by himself 

 (ep. cit., i, p. xxvii), signifies "Great Britain with Ireland," for, until I met with it last June 

 C. tutinella was not known to have ever occurred in any part of the British Isles. — E. R. B. 



