THE ENTOMOLOGIST. 7 



legs. The spiracles are bordered with black, the margins 

 being somewhat expanded on the under side, so that they 

 present the outline of a hart's hoof; above them are the 

 orifices of the glands. 



This larva differs from that of Connata in the absence of 

 the yellow lines on the back next to the blue stripe ; also in 

 the ground colour being less green, and in having no row 

 of darker dots above the spiracles; the skin below these is 

 also less verrucose. From the larva of Sylvarum it differs in 

 being less yellow and more of a gray tint; the head also is 

 darker, and the dorsal stripe begins higher up and extends 

 further; it is also more verrucose below the spiracles. 



As regards food, Femorata eats the leaves of the willow, 

 while Connata feeds on alder, and Sylvarum on birch. 



Femorata lives in the larva state from June to August or 

 September. It does not pass the pupa state on the branches, 

 but makes its cocoon in the mould or at the roots of the trees. 

 The cocoon is of a dark colour. The insect only enters into 

 the pupa state a fortnight or three weeks before its emergence 

 as an imago, which, like the other species, gnaws off a piece 

 of the cocoon. Some larvre remain two winters or, more 

 accurately, a year and a half in the cocoon. 



The only difference between the male of this species and 

 that of Connata is that the wings do not exhibit any blue 

 tinge. I do not consider it necessary to give a detailed 

 description of this insect; a comparison of figs. 4 and 5 with 

 fig. 16 of plate 2, vol. vii., first series, will suffice. I should 

 only say that the colour of the body appears to me to be 

 darker, while the antennae are more entirely red. I cannot, 

 however, state confidently that these characters always 

 prevail. 



The female also differs very little from that of the species 

 mentioned. The thorax, which is more of a bronze colour in 

 Connata, is, together with the head, in this species more 

 thickly covered with woolly, brownish yellow hairs. The 

 purple of the abdomen is in this species much blacker, has 

 less of a coppery tint, and generally does not extend so far 

 backwards: for example, in Connata, segments 1 and 2 and 

 a triangle on segment 3 are of that colour; in Femorata only 

 the first segment, with triangles on the centre of two or more 

 succeedins: segments. 



