204 [November 



sides, they all three bored through the millinet and escaped; and I 

 DOW recollect that the thirty or forty Dryocampa, that I have bred in 

 different years, were all bred in a cage with sides of wire-gauze ; although, 

 singularly enough, I bred my S. distigma in a luillinet cage, and not a 

 single larva of some twenty that I had on hand, bored its way out. 

 The above question, therefore, must remain for the present in abey- 

 ance; but I clearly ascertained that the bicolor larva is not the imma- 

 ture form of some other Drijocavipa — i^tir/ma or rublrunda for example 

 — for all my three specimens retained their peculiar colorational and 

 structural characters up to the date of their disappearance. 



Arhopalus robini^ Forst. Walsh and A. pictus Drury Walsh. 



(Coleoptera.) 



The larva of jn'ctus has been fully described and figured by Osten 

 Sacken. (^Proc. &c. I. pp. 121-2.) That of robinise, as I have already 

 observed, has never yet been fully described. On June 29 I procured 

 six of them, .55 — .75 inch long, from a branch of locust one and a half 

 nch in diameter, which they had completely honeycombed, heartwood 

 and all. They differ in the following particulars from picfux as de- 

 scribed by Osten Sacken : 



Is^. They have very distinct, though small, brown-black legs, the first 

 pair placed halfway from the centre of the sternum to the lateral edge, 

 and upon that fleshy, transverse fold behind the prosternum and 

 separated by a furrow from it, which is said by Erichson to occur 

 in all Cerambycidse ; the third pair on the metasternum in range with 

 the first; the second pair on the mesosternum considerably inside 

 of a line connecting the first and third. This latter arrangement is 

 probably due to the thoracic spiracle being, as in all Ceramhycidae as 

 distinguished from Lamiidse,^ located on the mesothorax and so crowd- 

 ing the leg inwards. Each leg is conical, not quite .02 inch long, with 

 a basal diameter of over .01 inch, and 3-jointed, with the last joint a 

 little prolonged in a slender thorn. According to Erichson as quoted 

 by Osten Sacken, all Longicorn larvae, except those of Lamiidse, "have 

 feet, which, however, are sometimes so small as to be perceptible only 

 when magnified even in lai'ge-sized larvae." {Proc. &.c. I. p. 119.) Yet 

 not only does Osten Sacken describe and figure the larva of pic f us as 

 apod, but he expressly says that ■' the larva of Arliopalas has no feet, 

 although belonging to the Cerambycldie." {Ibid.) Can it be possible, 

 that of two such closely allied species as rohiniae. and pictus.^ one is apod 

 in the larva state and the other has distinct feet? Or ax-e the feet mi- 



