78 f September 



moult, the blackish colouring is lost from the interior, so that only th 

 head retains its colour, and the neck plate and two or three followin 

 segments become greyish : the general appearance now remains muc 

 the same for some time, till the length of 9 mm. has been attained, th 

 skin being so clear that the pulsating dorsal vessel can be seen betwee 

 it and the dark internal organs. 



During hibernation the length remains the same, but the bod 

 becomes somewhat stouter ; at the beginning of March, the head i 

 reddish-brown, the body dark slaty-grey brown with blackish dors£ 

 line, but the back of the eleventh and thirteenth segments, the froE 

 margin of the second, and all the legs, are greyish -white ; the skin i 

 still so clear that the tracheal threads can be seen through it. Froi 

 this time, as the larva increases in size, it seems to become darker i 

 tint, and the skin becomes less transparent, and is in itself of a dirt 

 whitish tint, and the dusky dots become less distinguishable ; when th 

 length is about 12 mm., the general colour is brownish-black or blacl 

 the head darker than before but retaining its reddish-brown tinge, tt 

 middle part of the upper lip paler reddish-brown, the jaws black ; th 

 anal flap pale-brownish and serai-transparent, as are all the legs, aii 

 the papillae. At this stage, however, it seems the colour may vary a 

 cording to the state of the food, or the proximity of a moult ; it w: 

 noticed that a larva, which was looking pale greyish-drab, and wv, 

 therefore considered a variety, on having its food damped turned bla(. 

 in twenty-four hours ; and a figure was taken of a larva, more than J 

 mm. long, preparing for a moult, drab in colour, with the dots showi: 

 black; probably every moult is preceded by an obscuring of the daii 

 internal organs, so that the colour at such times would always be pak 



A habitation of the larva depicted by Mr. Buckler represents 

 agglomeration of pieces of straw, &c., about 3 inches long, and md 

 than half-an-inch wide. 



The full-grown larva is 22 mm. in length, or 26 mm. when i 

 tended, and just 3 mm. across the back at about its middle ; the figur* 

 cylindrical, and the bulk very even throughout, except that the roune 

 head is rather narrower than the second segment, which is itself : 

 BO wide as the rest, being not so much puffed at the sides ; i1 

 noticeable, however, that the sub-spiracular ridge is less promin 

 than in pinf/uinalis ; the skin is brilliantly glossy all over, but un}* 

 the microscope is seen to be very finely and beautifully shagree 

 the divisions between the second and third, and the third and foi 

 segments (as in pinguinalis andifarinalis also) are curiously plica 

 the folds broadening in a curve from the spiracular level to the <ei 



