250 THE entomologist's record, 



sion of the brown band by the green sides ; in the last skin it 

 is included in the band. The hairs also are shorter than in last 

 skin. The cast heads are very definite, in the 3rd skin all are 

 small and black, in 4th they are coloured, but in the 4-moulters 

 (type) the change in size is marvellous. In the 5-moulters 

 the change is proportional to that in previous skins, and the 

 head of the 5th skin corresponds more nearly to that of 

 the 4-moulters, but is decidedly larger. The head of the 

 5-moulters in last skin appears to be decidedly larger than the 

 type, but, being on living larva, is not easy to compare accu- 

 rately. In the last skin, the tubercles in the dorsal band are 

 black with a pale circle round the base of the primary hairs, 

 and there are one or two secondary hairs of more importance 

 than the others, which have pale bulbous bases. The tubercles 

 on the pale area also have distinctly a primary hair (except the 

 marginal), but they are less strikingly differentiated from the 

 others. There is an indication on 7 and 8 of a pre-spiracular 

 tubercle, one hair being present. On the marginal tubercle, 

 the hairs are pale and more numerous, the tubercles forming a 

 marginal eminence, and the hairs a fringe in the manner, 

 though not so decidedly, of incgaccpJiala. Beneath the marginal 

 there is, on the segments unprovided with legs, a ventral 

 tubercle with several pale hairs and other scattered hairs 

 nearer the middle representing one or more tubercles, but 

 without any raised base. In the dark specimen, the tubercles 

 of 13 are black, and the circumspiracular tend to have some 

 dark tinting on their margins, the darkness of the green area 

 consists in the hair-points being very black, the skin generally 

 being denser and more opaque, certain ill-defined brownish 

 clouds, of which the most definite forms a waved arch on each 

 segment passing over the spiracles, and others most marked 

 above and in front of the supra-spiracular tubercle. August 

 igth, — 7 of the 4-moulters have this evening become dark 

 coloured, and, when offered some rotten wood, at once com- 

 menced to burrow into it. In this state the dorsal tubercles 

 become very distinct and the arched position noted by Mr. 

 Buckler and the prominent angle given to 5, 8, g and 10 are 

 obvious. That six-sevenths of the brood were 4-moulters only 

 was undoubted, but that so large a proportion as 15 per cent, 

 should vary to 5 moults is remarkable. The great jump from 

 4th to 5th skin as measured by the size of the head and the 

 large proportion of exceptions, would suggest that siHgosa has 

 not acquired the habit of being a 4-moulter for so long or so 



