THE CANADIAN ENTOMOLOGIST. 209 



I am not certain that I have seen either of these Oak-feeding species. 

 I have, however, several Oak-feeding species differing slightly from these, 

 and from each other. Dr. Clemens seems to have doubted whether the 

 species described by him were really distinct ; and mine, and those of Dr. 

 Clemens resemble each other so closely, that only an attentive study of 

 the mines and insects in all their stages, and with many specimens, can 

 give anything like certainty as to the distinctness of species. I therefore 

 postpone any further descriptions of species. 



CEMIOSTOMA. 



C. albe/la, ante, mines the leaves of the Cottonwood (Populus monili- 

 fera), and may, therefore, be an American species — if it is not the Euro- 

 pean C. susinella. 



I have also cocoons of a species which mines the leaves of Yellow 

 Willow (Salix alba), and Weeping Willow ( S. Babylonica) — both im- 

 ported species. The cocoons do not differ from those of C. albeit a, and 

 possibly it may be that species. The mines are very filthy, and the larva 

 hides in the frass, its filthy habits contrasting strongly with the singular 

 purity and beauty of the resurrected imago. 



ON THE LARVA OF HYPERETIS ALIENARIA, Herr. Sell. 



BY W. SAUNDERS, LONDON, ONT. 



The larva of this beautiful geometric moth is dark brown, and feeds on 

 beech. The specimens, from which the subjoined description was made, 

 were taken on the ioth of September, by beating the branches of some 

 beech trees over an umbrella. 



Length one inch, body cylindrical. 



Head medium sized, bilobed, dark brown, with two bluish-white lines 

 in front ; mandibles paler. 



Body above, dark brown, with a row of dull white dots on each side, 

 one or two on each segment, most prominent from fifth to eighth seg- 

 ments inclusive, less distinct towards each extremity. On the posterior 

 part of ninth segment were two rather prominent roundish black tubercles, 

 with a few whitish streaks in front at their base. Terminal segment of a 

 bluish tint, flattened and spreading. 



