14,g [December. 



The length of the full-grown larva is three-quarters of an inch 

 or a trifle more, the form tapering much anteriorly and a little 

 posteriori} 7 ", the well-defined segments plump on the belly, and sub- 

 divided on the back near the middle of each by a deep wrinkle ; the | 

 colour of the head is pale semi-pellucid yellowish-brown blotched with 

 a deeper tint of the same, the second segment is of a bright transparent 

 yellowish-green, and near the end of this two sub-dorsal stripes begin 

 at first as mere lines, but gradually widen through the third and fourth 

 and from thence are uniformly very broad of opaque primrose -yellow, 

 relieved above by a narrow dorsal stripe of the transparent green, and 

 below by another stripe of this colour which melts into the pale 

 whitish-greenish tint of the belly just where the pale tracheal thread 

 shows faintly ; the anal flap is of sulphur-yellow ; the pale spiracles 

 extremely small ; the slightly raised tubercular warts are of the ground 

 colour where they occur, but those on the yellow have a central dot of 

 green, and from each wart proceeds a fine pale hair ; the skin is glossy 

 throughout. In short this larva is extremely like that of its congener 

 prunalis, but with the important and striking difference that the sub- 

 dorsal regions are primrose-yellow instead of white. 



"When quite full-fed it loses its distinctness of colours and becomes 

 just before spinning up of a semi-transparent light amber-yellow all 

 over. 



The cocoon is the lining of a cavity formed by folding down the 

 side of a leaf or otherwise contrived between two leaves, made ofj 

 white silk, thin but strong, of oval form, and half-an-inch in length : 

 the pupa is three-eighths of an inch long, broadest across the well- 

 produced thorax, the wing-covers of moderate length, the leg- and 

 antenna-cases a little longer and free at the end, the fixed segments ofi 

 the abdomen are slightly keeled on the back and have very large! 

 spiracles, while those on the movable and tapering segments are of 

 ordinary size, each segment has five or six transverse ridges, the mosfl 

 prominent being at the hind edge ; the anal tip ends in a pointed and! 

 flattened prolongation furnished with curly-topped converging spines 

 firmly fixed in the silken cocoon ; the whole surface is black, and dull 

 generally, though glistening a little on the back, and is only really 

 glossy on the two hinder segments ; moreover, with a strong lens aj 

 few fine hairs are just visible, that is, one from each wart where these 

 traces of the larval skin still remain. 



Emsworth : October 25th, 1881. 



