4 THE ENTOMOLOGIST. 



tliircl group (if one may say of the two former that they each 

 separately form a group) ; and there remain in addition 

 C. connata, Schr., Sylvarum, F., Femorata, L., and perhaps 

 Fagi, Zadd.^ respecting which it is not yet proved, not only 

 whether it be indigenous, but also whether it be a species. 



This last group was regarded by Klug and subsequently 

 by Hartig, following the first-named author, as forming one 

 species, Cimbex variabilis, which name I adopted in my first 

 catalogue. It is, however, quite certain, and has been shown 

 by repeated observations of its metamorphosis, that C. con- 

 nata, the first species in my new catalogue, is a distinctly 

 separate species ; its metamorphosis is described and figured 

 in the seventh volume of this publication* {]}. bd et seq., 

 pi. 1 and 2). With about equal certainly, chiefly relying on 

 the different coloration of the female, it may be taken that 

 Sylvarum, F. (Betula3, ZadcL), is a true species. Perhaps 

 Fagi will have to be referred to this last species; this is, 

 however, doubtful, if, as Brischke considers, the larva displays 

 fixed distinguishing characteristics, and feeds exclusively on 

 beech. There remains, lastly, one other species, feeding on 

 willows, and which will form the subject of this paper. 

 There is, however, another difficulty with regard to this 

 species. Brischke, who found these insects in great numbers, 

 divides them into two groups : the one, which remains of a 

 sordid green colour during the whole of its larval existence, 

 lives, according to this author, on smooth-leaved willows; 

 the other, which at the latter period of its larval state 

 becomes reddish, or even flesh-coloured, lives on the leaves 

 of the goat-willow (Salix capraja). 1 have never seen 

 these red larva), but, at the same time, I have never met with 

 Cimbex larvae on the goat-willow. This being so, we are 

 not much concerned with the question whether this larva, 

 which is only known to us by description, really represents a 

 species or not. Nevertheless, should the pale variety Fallens 

 be produced from it, and, as Brischke asserts, from it alone, 

 it would occur in the neighbourhood of Arnhem. 



Although willows are very numerous in our well-watered 

 country, the larger insects inhabiting this species of tree are 

 never met with in large quantities. Perhaps excursions, 



'■= 'Tijclsclirift voor Eutomologie ' ; translated in 'Zoologist' for 

 July, 1«G<J. 



