8654 



Insects. 



for my acquaintance with the larva of this sawfly. I had read the 

 descriptions of this insect by Bouche and Hartig, and subsequently 

 the account given by Brischke ; but I had never actually seen the 

 larva. Notwithstanding that I had carefully looked for it in the neigh- 

 bourhood of the locality where I had found the imago, I had never 

 been fortunate enough to meet with it ; and I was obliged to content 

 myself with what was given by the above-named authors. I was 

 accordingly much pleased to receive from M. De Roo some indi- 

 viduals which he sent me on the 1st of October, 1858, and which he 

 had met with at Velp, on the stems and leaves of Scrophularia nodosa. 

 They were in various stages of growth ; the smallest, 'as represented 

 on plate 7, fig. 1, of a bluish very pale gray, with black spots ; the 

 largest, in size and colouring as represented at fig. 2, of a more ashy 

 gray tint. The length of the smaller was 2 centimetres, that of the 

 largest 2.5. In all the head was oval, depressed on the forehead, 

 black to just below the eyes and just above the antennae ; thence to 

 below the trophi obscure greenish gray ; the parts of the mouth were 

 of the same colour, with the exception of the sharp upper jaws, which 

 were brown. Moreover, the whole head was beset with a pale gray 

 velvety pubescence. Bouche says, " Der fast Kugliche Kopf hat hell- 

 braune Augen," which is repeated by Hartig ; this, however, is not the 

 case. The eyes, which are very small, are shining black, as stated 

 by Bouche, but are placed in an obscure greenish gray round spot. 



The skin of the larva has a somewhat velvety appearance. The 

 body is broadest at the second and third segments ; but generally the 

 larva can hardly be called attenuated. There are twenty-two legs, 

 the fourth segment alone being apodal. The legs proper are yel- 

 lowish pale gray, with a black base to the first joint, and brown claws ; 

 the claspers, as also the ventral surface, are immaculate yellowish 

 white. The spiracles have pale brown margins ; below them on each 

 segment are two black spots in the centres of two dermal projections. 

 Along the middle of the back is a row of eleven larger, round, dull 

 black spots ; thence to the stigmata are three waved lines of spots, of 

 which there are six on either side of each segment, which is divided 

 into five dermal folds. A triangular spot above the stigma is the largest 

 of these six. In order to make this clearer we have given at fig. 3 a 

 separate representation of one of the middle segments magnified : this 

 is a more exact and clearer figure than that given by Brischke. 



After the last moult the larva has an entirely different appearance, 

 as we before observed in the case of another species of Allantus (tri- 

 cinctus). It is then of an uniform reddish brown, with a darker dor- 



