•296 Mr. Foulton' a furtkcr notes upon the 



Since writing the above I have examined the larvae in 

 the first stage under high powers, and I find that both 

 S. ocellatns and S. popnli are covered with minute 

 hairs with highly forked ends, while there are more 

 thinly scattered longer hairs some of which are not 

 forked at all, while others terminate in a comparatively 

 small and simple fork. These longer hairs are arranged 

 upon the back in the same way as the long hairs of the 

 first stage of ^S'. ligustri, and in S. ocellatns there 

 are similar dorsal rows of white spots, which form 

 part of the oblique stripes, as in *S'. ligustri, except 

 that the spots of the posterior pair are included in the 

 stripes of the former, while they fall outside them in 

 the latter. These facts bring the young stages of 

 Smeriuthus and Sphinx very near together. There is 

 also a specially prominent row of the longer hairs upon 

 the prothorax, just behind the head, of the young 

 Smerinthus larvfe, and these leave their effects, much 

 later in the ontogeny, as a row of conspicuous shagreen 

 dots in this situation. 



Mr. Meldola describes from Mr. Roland Trimen, in 

 the Appendix to his translation of Weismann's book 

 (' Studies in the Theory of Descent,' part ii., p. 527), a 

 very remarkable larva of a Smerinthine hawk-moth, 

 Lophostcthus Diiinolini, which seems to throw some light 

 upon the appearance of Smerinthus larvae, when the 

 forked bristles remained of appreciable size through- 

 out the ontogeny. This larva bears on all segments 

 (except the head and prothorax) black spines, springing 

 from tubercular bases. The longest spines form two 

 dorsal rows from the metathorax to the 7th abdominal 

 segment. Some of these spines are beset with prickles 

 for the upper three-fourths of their length, and the 

 caudal horn is also covered witli prieldes. There are also 

 lateral rows of spines. The young larvae have longer 

 spines with long prickles on them, and the caudal horn 

 and the spines on the meso- and metathorax are 

 distinctly forked. I expect that it will be proved that the 

 caudal horn does not correspond to a spine, but that the 

 prickles upon it represent dwarfed spines. This is 

 certainly so in Smerinthus, where traces of the long and 

 short hairs with their forked extremities are found upon 

 the horn in the first stage. The points of special 

 resemblance have been italicised in the above description. 



