24 THE CANADIAN ENTOMOLOGIST. 



first costal streak produced to the anal angle ; in having a pale golden 

 streak in the cilice, behind the apical spot, which is not mentioned by 

 Stainton, and in having only two faint fuscus spots in the cilice, one of 

 them at the apex very indistinct, instead of two ciliary fuscus streaks point- 

 ing upwards, as Stainton says of Susinella ; and still more in having a 

 distinct tuft on the vertex, whilst, according to Stainton, C. Scitclla is the 

 only known species which possesses such a tuft, and Scitclla cannot be 

 mistaken for this. It is also clearly distinct from C. Spartifoliclla and C. 

 Z.abumclla, although it strongly resembles them. 



The larva mines the leaves of the silver-leaved and Lombardy poplars, 

 (P. Alba and P. Dilatata.) Susinella mines the leaves of P. Trcmula and 

 these are the only known poplar-feeding species. It leaves the mine in 

 the latter part of September, and spinning about them small cables of the 

 purest white silk, it spins its cocoon beneath them and becomes a pupa in 

 the fall, the imago emerging in the next April. Tne cocoon is oval, flat, 

 and snowy white. According to Stainton Spartifoliclla is the only species 

 which forms its cocoon in such situations. 



If, as 1 believe, this insect is distinct from Susinella. it has not yet been 

 observed in Europe. Yet as both of the trees upon which it feeds are 

 imported species, Albclla is probably a European insect. So far as I am 

 informed this is the first time that any species of Cemiostoma has been ob- 

 served in this country, and yet Albclla is very abundant on both P. Alba 

 and P. dilatata, and it is strange that it has not been observed both in this 

 country and in Europe, if it is found there. The mine is very conspicuous, 

 and sometimes the upper and lower cuticles of the entire leaf are separ- 

 ated, and the leaf deadened, but in such cases several larvae are found 

 in it. 



Up to the date of the publication of Vol. 1. of Stainton's Tineina but 

 six species of Cemiostoma had been observed, all of which were found 

 upon the European continent, but only three of which had been observed 

 in England. Susinella, which approaches most nearly to Albclla, has never 

 yet been found in England, but I believe that since the publication of that 

 work two new species have been discovered in England, and one or two in 

 India. 



A single specimen of Albclla Avas sent to Mr. Stainton, (by your kind- 

 ness,) who writes that he is inclined to separate it as a distinct species, but 

 that he cannot be positive, as the specimen was slightly injured. Among 

 tour specimens examined by me I cannot discover the slightest difference. 



