Insects. 7723 



tial black spot. The larva has altogether twenty legs ; these are 

 orange-coloured, with darker indentations at the joints, and having 

 brown claws to the thoracic legs. The greatest length of the larviE is 

 20 mm. 



My larvae fed upon the leaves of the Italian and Canadian poplar 

 [Popuius vwnilifera and P. tremula) until the end of August. Ac- 

 cording to Bouche they also feed on the leaves of Popuius balsami- 

 fera. They live in company, and keep on the under side of the leaf, 

 afterwards eating the edge. In the last week of August and the first 

 week of September they descend from the trees, when they spin up 

 in cocoons among the fallen leaves or in the crevices of the stems. 

 These cocoons are very thin, of a yellow colour and shining. Although 

 these cocoons are very thin, they are composed of two layers, the 

 outward one somewhat coarser, the internal layer very fine. They 

 are yellow or light brown, and shining as if varnished. 



They remain enclosed without change until the beginning of June. 

 . At that date my larvae cast an exceedingly thin skin, and changed 

 into orange-yellow pupae, as represented in fig. 3. Strictly speaking 

 the body only was orange ; the head, antennae, legs and wings being 

 yellow ; the eyes are black. These pupae are probably paler at first, 

 becoming gradually deeper coloured. After shedding this last skin 

 they bit open the cocoon, having become imagos, and sought the day- 

 light and the warmth of the sun. 



Fig. 4 represents a female of this species magnified nearly three 

 times. The outward distinction between the sexes consists in this, — 

 that in the female the abdomen is larger, more especially thicker, 

 and that the inales have a little knob on the under side of the third 

 joint of the antennae ; also their antennae are somewhat thickly 

 clothed with short hairs, which, as well as the little knob, are wanting 

 in the antennae of the female. Cladins viminalis differs from the 

 other indigenous species of Cladii in the form of the upper jaws, 

 which, after the large terminal tooth, have two smaller teeth, instead 

 of being notched like a saw. 



The imago is 9 mm. long, expanding to 16 mm., and orange- 

 yellow ; only the head, the prothorax (with the exception of the pro- 

 notum), the back, and a 'spot on the breast are shining black; the 

 antenna?, are brown on the upper side, dirty yellow beneath ; the palpi 

 are yellow, and the terminations of the joints of the tarsi brown. The 

 wings are a light reddish yellow, which vanishes towards the apical 

 margin ; the costal cell alone is bright yellow ; the stigma is black- 

 brown towards the base, and yellow towards the apex of the wing ; 



