The Zoologist — March, 1867. 641 



was of a more or less brownish yellow tint. The cocoon which 

 produced the imago was that one having the most tendency towards 

 brown, that from which the parasite appeared having the most tendency 

 towards a green colour. I did not risk opening any of the cocoons so 

 as to examine the pupa : in order to do this, with the least chance of 

 interfering with the development of the pupa, you must know within 

 a little when you may expect to find the pupa formed in the cocoon, 

 but this I knew nothing about. 



On the 26th of May, 1860, I was surprised at the appearing of an 

 imago, which, on the authority of Klug and Hartig, I had always 

 looked upon as a variety of C. Lucorum. The male example, which 

 I reared, could have served for the description given by De Geer of an 

 imago which he held to be Tenthredo Amerinae, and which he reared 

 from a larva found on a willow, the said larva having neither brown 

 nor red on the vertex. Now I am uncertain whether the species which 

 he reared was identical with mine, Jirst, on account of the difference 

 (although small) in the larva ; secondly, on account of the difference 

 of food- plant; and, lastly, from the fact that I am not perfectly sure 

 whether De Geer, departing from his usual accuracy, has not failed to 

 keep to one species ; for after stating the abdomen of ihe male to be 

 ferruginous on the sides and under surface, and that of the female to 

 be entirely of that colour, he adds, that among the rest was a pair of 

 imagos which had the abdomen entirely black, and others having 

 brownish yellow antennae, with black knobs. It is to be hoped that 

 the obscure points in these observations of De Geer will be cleared up 

 by further investigations. 



In the absence of Leach's work, and on the ground of our example, 

 which was a male, agreeing with the plate and accompanying text of 

 Curtis, we must hold it to be Trichiosoma laterale of Leach. The 

 length was nineteen millimetres; expanse very nearly forty millimetres. 

 Head shining black, with some brown hairs on the vertex and cheeks. 

 The eyes were, after death, purplish gray (I omitted to notice their 

 appearance during life) ; ocelli black and dull after death. Antennae 

 (fig. 8) containing seven joints, of which the third was the longest and 

 narrowest, the last forming a rounded knob on which two or three 

 transverse lines were obscurely apparent, as if it were composed of 

 three joints anchylosed. The antennae were black, only that on the 

 upper margins of the third and fourth joints there was a trace of 

 yellow. The upper lip (fig. 9), in this example closed, was large, 

 semicircular, and shining black. Upper jaws (fig. 10) long and narrow, 



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