232 Studies in the Theory of Descent. 



state, belong to the sixth phyletic stage, not 

 unfrequently show the characters of they/M stage 

 more or less developed, as, for example, D. Vesper- 

 HKo* 



THE GENUS SMERINTHUS, LATREILLE. 



The caterpillars of this genus are very similar 

 in appearance, and all possess extremely simple 



27 [In concluding this account of the Chcerocampincz I may 

 call attention to the following species, which have since been 

 figured by Burmeister : Pachylia Ficus, Linn. (loc. cit. PI. XIV,, 

 Figs, i and 2) ; during the three first stages the larva is uni- 

 formly green, with a yellow subdorsal line, and below this ten 

 oblique yellow stripes slanting away from the head ; after the 

 third moult the colour completely changes, the whole area of 

 the body being divided into two distinct portions by the sub- 

 dorsal line, above which the colour is red, and underneath of 

 a pale green ; the oblique stripes have almost disappeared ; no 

 occelli nor annuli are present. Pachylia Syces, Hiibn. (loc. cit. 

 Fig- 3) j very similar to the last species in its young stages 

 (figured also by Merian, Surin. pi. 33). Philampelus Vitis, 

 Linn. (loc. cit. Figs. 4 and 5) ; two stages represented ; between 

 first and second moults green, with oblique paler stripes slant- 

 ing in same direction as in Pachylia, and each one containing 

 a red streak surrounding the spiracle. When adult, the 

 ground-colour is yellow above and green beneath, the whole 

 surface being mottled with deep black and red transverse 

 markings ; the oblique stripes whitish, bordered with black at 

 their lower extremities (figured also by Me'rian, pis. 9 and 39). 

 Philampelus Anchemolus, Cram. (loc. cit. PI. XV., Fig. i ; Merian, 

 pl- 47) j green when young, with seven oblique red stripes ; 

 when adult, uniformly brown, with seven pale yellow lateral 

 markings, the first four of which are spots, and the remainder 

 broad oblique stripes slanting forwards. Philampelus Labrusae, 

 (see note 13, p. 195). R.M.] 



