Phyletic Parallelism in Meiamorphic Species. 457 



tions on this point. The only certain instance 

 that I can here mention is that of the Alpine and 

 Polar form of Pier is Napi. This variety, Bryonia, 

 the female of which differs so greatly in marking 

 and colouring, possesses larvae which cannot be 

 distinguished from those of the ordinary form of 

 Napi. (See part I. appendix I. p. 124.) 



That caterpillars can also vary locally without 

 thereby affecting the imagines is shown by the 

 frequently mentioned and closly investigated cases 

 of di- and polymorphism in the larvae of a number 

 of Sphingidez (M. Stellatarum^ A. Atropos> S. 

 Convolvuli, C.Elpenor, and Porcellus t &.c.). The 

 same thing is still more clearly shown by those 

 instances in which there are not several but only 

 one distinct larval form occurring in each of two 

 different localities. 



To this class belongs the above-mentioned case 

 of Charocampa Celerio (p. 197), supposing our 

 information concerning this species to be correct ; 

 likewise the recently-mentioned case of the 

 Ligurian variety of the caterpillar of Saturnia 

 Carpini; and finally the case of Eriogaster Lanes- 

 tris, so well known to lepidopterists. This 

 insect inhabits the plains of Germany, and in the 

 Alps extends to an elevation of 7000 feet, where it 

 possesses a larva differently marked and coloured 

 (E. Arbuscultz) to those of the lowlands whilst the 

 moths are smaller, but do not differ in other respects 

 from those of the plains. 



