244 THE ENTOMOLOGIST. 



younger examples they are the more numerous ; few and sparse 

 and mconspicuous, however, at best. Length of larva about 

 1*75 inch; thickness 0"25 inch; when full-grown. 



The Pupa, in general outline, can scarcely be distinguished 

 from that of an ordinary Noctua ; each abdominal segment bears 

 a whorl of minute blunt points ; the anterior wing-covers alone 

 are visible ; on these all the nervules are traced in black, on the 

 red-brown hue which else is general ; surface polished. I observe 

 that a silken thread, attached to the anal point, floats to some 

 distance (half an inch or more) in the preserving fluid. This 

 thread readily catches any object as a pin or stick, and is so 

 tenacious that the pupa can be pulled out and suspended in the 

 air by it alone. Length 0"85 inch ; greatest width 0'27 inch. 



Between these larvae and pupae of U. Sloanus, and those of 

 U. Fernandincd, described and figured by Macleay (Tr. Zool. 

 Soc. i. p. 186, pi. 26), there is considerable diversity. The 

 former, though of like length, is much more slender; the red 

 hue of the head is more uniform, and much duller ; and, though 

 the black and white of the body vary much, in relative propor- 

 tion, in individuals, yet the black decidedly preponderates ; in 

 many examples to the almost total evanescence of the white ; 

 and thus the contrast of the prothoracic with the following 

 segments is much less conspicuous. The pupa is of a deep 

 chestnut hue ; and the wing-cover does not sensibly project from 

 the general outline, as it does in Macleay's figure. 



The outline of the pupa well agrees with that of Corinidia (?) 

 Orithea figured by Prof. Westwood (Tr. Zool. Soc. x. pi. 85, 

 fig. 2) ; save that its thickness from back to breast is propor- 

 tionally less ; the facial parts are less prominent ; there is no 

 deflexion of the terminal segment ; no spine ; and the tongue- 

 case is not lengthened beyond the wing-cases. 



The figure of the larva (Ibid. fig. 1) very well agrees in 

 outline with U. Sloanus ; if we double the dimensions of the 

 head and prothorax, and omit the spines and tubercles of 

 the body.* 



* Sganzin's description of the larva of Rldplicus will Ly no means serve for 

 Sloanus. The body is certainly not stouter in the middle; but, as nearly as may be, 

 equally thick throughout. I recognise a certain likeness to a Geometric caterpillar, 



thougli, as he notes, the prolegs are fully developed. 



