Appendix. 527 



this genus. C/t. Clot/to, Drury, belongs to the third 

 group (figured by Semper ; see note 3 to this Appendix). 

 The larva of C/t. Lucasii, Walk., offers another instance 

 of the retention of the subdorsal line by an ocellated 

 species. The larva of C/t. Lycetus, Cram., of which 

 Mr. Moore was so good as to show me descriptions made 

 at the various stages of growth, presents many points of 

 interest. It belongs to the third phyletic group, and all 

 the ocelli appear at a very early stage. The dimor- 

 phism appears also in the young larvae, some being 

 green, and others black, a fact which may be explained 

 by the law of " backward transference " (see p. 274). A 

 most suggestive feature is presented by the caudal horn, 

 which in the young caterpillar is stated to be freely 

 movable. It is possible that this horn, which was formerly 

 possessed by the ancestors of the Sphingidce, and which 

 is now retained in many genera, is a remnant of a 

 flagellate organ having a similar function to the head- 

 tentacles of the Paj>i/io-\a.rvx, or to the caudal appen- 

 dages of Dicranura (see p. 289). 



Lophostethus Ditmolinii, Angas. The larva of this 

 species differs so remarkably from those of all other 

 Sphingida, that I have thought it of sufficient interest 

 to publish the following description, kindly furnished by 

 Mr. Roland Trimen, who in answer to my application 

 sent the following notes : " My knowledge of the very 



' remarkable larva of this large and curious Smerinthine 

 Hawk-moth is derived from a photograph by the late 

 Dr. J. E. Seaman,' and from drawings and notes recently 

 furnished by Mr. W. D. Gooch. The colour is greenish- 

 white, inclining to grey, and in the male there is a yellow, 

 but in the female a bluish, tinge in this. All the seg- 

 ments but the second and the head bear strong black 

 spines, having a lustre of steel blue, and springing from 

 a pale yellow tubercular base. The longest of these 

 spines are in two dorsal rows from the fourth to the 



