1416 The Zoologist — October, 18G8. 



The other imago made its appearance later in the year. On com- 

 paring this sawfly with that represented on plate 5 in the second 

 volume of the ' Transactions' (Nematus septentrionalis), it will be seen 

 that a great resemblance exists between them. Both are characterized 

 by the remarkably expanded hinder tibiae and tarsi : the great dif- 

 ference between the present and the species before treated of consists 

 in the red femora and unspotted wings. The head is black, with the 

 emarginate border of the clypeus and the upper lip obscure white; 

 palpi reddish white; mandibles shining dark brown. Autennae long, 

 normal, black ; eyes also black, but the ocelli pale brown. Thorax 

 shining, black, but hirsute, in consequence of which the smoothness is 

 somewhat obscured; the borders of the prothorax and the tcgulae are 

 brown. Wings brownish white, transparent; the radius, posterior 

 margin of the stigma and the externo median nervine pale brown 

 (fig. 7) ; the anterior nervure of the posterior wings is also of this tint, 

 the remaining nervures being deep brown or black. In the second 

 submarginal cell is a black horny spot. The cenchri are white ; 

 abdomen black, shining; the third, fourth and fifth segments and the 

 margin of the second clear red ; the anal projections and the parts 

 surrounding the saw are black and pubescent. All the coxae are 

 black, with the extremities obscure white; the anterior legs are pale 

 brown; the femora of the second pair of legs are pale reddish brown, 

 with their tibiae pale brown and the tarsi of a yet paler tint. The 

 posterior legs have the femora thickened and of a clear red colour, 

 the knees being black; the tibiae are just tipped with black at the 

 base, then white nearly to the middle, then dilated, flattened, black, 

 very shortly hirsute, and having two unequal spines. Tarsi black, the 

 first joint being particularly broad and flattened; claws brown. 



This insect is very seldom taken on the wing. According to Hartig 

 the male has the same colouring as the female. 



Cladius albipes, Hartig. 

 Larva and imago, Hartig, Blatt. unci Holzwespen, p. 178 (albipes). 

 Brischke, Abbildungen, &c, p. 10, tab. ii., fig. 2. Ratzeburg, 

 Die Forstinseclen, vol. iii. p. 129. 



Cladius antennis maris simplicibus, niger, pedibus, pro majori 

 parte albis. 



We have now to describe a species having four generations in the 

 year, which appears a large number when we consider that most saw- 



