128 THE entomologist's record. 



shade across between segments 13 and 14, and this, with other 

 dark tinting laterally, gives an appearance of 10, 11, 12, and 

 especially 13 and 14, having the yellow lozenges of the adult or 

 a strong indication of them, the colour being yellower than 

 the creamy white of 4th skin. The loth and 12th are 

 sometimes very dark in this connection, and the front margin 

 of the 2nd segment is yellow. The spathulate hairs are spread 

 laterally instead of being erect as in the previous skins ; these 

 hairs are really spathulate as in the other skin, though smaller, 

 much more so than is occasionally to be seen in an unusually 

 fine larva in 4th skin. 



The length of these hairs will give some idea of the relative 

 development in this respect, and will also show that the extra- 

 moulter produces a larger adult larva than normal. 



Lengths of spathulate hairs : — 



It is to be noted that these larvae produced moths of both 

 sexes, and further, that the variation is not hereditary. The 

 memorandum, as to the ratio they presented to the normal 

 form given above, was for 1888. Ova were obtained in 1889 

 from these, but in i88g not one example of this variation in 

 moulting presented itself, either from the ova laid by the five- 

 moulters or from the ordinary types. A note on this form will 

 be found in the Ent. Mo. Mag., vol. xxiii., p. 226, and on the 

 result of the broods of i88g, in the Entomologist's Record, vol. 

 i., p. 271. 



The other var. of larva, of which only one specimen occurred, 

 appeared in 1889, and presented in its extra (5th) skin a form 

 much more nearly resembling the usual adult form, at least in 

 so far that it was on the whole dark, and had the 13 dorsal 

 yellow marks. The head, instead of being black, had the dorsal 

 half brown, as is usual in the 4th skin. The yellow patches 

 are very pale as to their ground colour, but look dark, owing 

 to the plates of the tubercles being a pale greenish or olive- 

 brown. Thus that of the 2nd segment is brown, almost like 

 the head ; segments 3 and 4 have each a double tubercle on 

 either side (as in the other skins, but noticeable here owing to 

 the colour differences) ; 5, 6, 7, 8, and 9 are very much alike, 



