42 



springs a long black bristle, those at the extremities being at least 

 twice as long as the body of the larva ; there are also two rows of 

 tubercles on each side of the larva, and from these as well as from 

 the warts on the back a number of long white hairs spring as well as 

 a still larger number of shorter, white, black-tipped hairs ; indeed, it 

 is more like a minute porcupine than anything else I can liken it to, 

 and so strong are the black bristles that it may be lifted by them in 

 a pair of forceps without in any way touching the body of the larva 

 (PI. XI, fig. 2).* 



In about ten days from the time of hatching out the first moult 

 takes place, and the larva on emerging from it shows little alteration 

 in appearance, but it now eats holes right through the leaf and grows 

 somewhat more rapidly. It moults a second time in from ten days 

 to a fortnight, again showing but slight change, except that the long 

 black spines appear to be, in proportion to the length of the body, 

 somewhat shorter. I suspect that it would be after the second moult, 

 or possibly the following one, that under natural conditions the larva 

 would pass the winter before again moulting ; but, as those that I 

 endeavoured to hibernate came to an untimely end, I am unable to 

 speak with certainty. 



Those that I fed up this autumn appeared to have moulted for the 

 third time by September 9th — just one month from the time of hatch- 

 ing — and from that time they fed up very rapidly, eating great patches 

 out of the leaves by night and resting by day, usually on the under- 

 sides of the leaves of their food plant. They changed their skins 

 pretty regularly at about weekly intervals, and by September 25th 

 a couple of them were making cocoons for pupation (PI. XII, fig. 2). 



With each moult the long bristles, so noticeable in the infant 

 larva, became less pronounced, so that the adult larva, although 

 intensely hairy, has nothing of the remarkable appearance notice- 

 able before the first moult, and from the time that the larva is 

 half grown sundry blackish markings appear (PI. XII, figs, i and 3). 

 As the full-fed larva and its method of pupation have already been 

 described, from examples taken after hibernation, by our member 

 Mr. J. Piatt Barrett (" Entom.," vol. ix, pp. 177-178), it is unneces- 

 sary that I should enter further into those details here, except to say 

 that the black band which he mentions as joining up the two rows of 

 markings at the seventh and eleventh segments appear to me to 

 result, so far as the seventh segment is concerned, from a row of 

 black, fleshy processes placed on that segment, which, although 

 fairly prominent in the later larval stages, I was unable to detect in 

 the infant larva. 



* The plate is taken from a " prepared" specimen, which, although bringing 

 out the detail, somewhat loses the natural effect. 



