1 90 Studies in the Theory of Descent. 



the third and fourth segments ; and the fourth 

 stage showed a repetition of the eye-spots, although 

 but rudimentary, on all the remaining segments 

 with the exception of the twelfth. 



Now if we compare the other known species 

 of Ch&rocampa larvae with the above, we shall 

 arrive at the interesting conclusion that all these 

 species can be arranged in three groups, which 

 correspond exactly with the three last phyletic 

 stages as just deduced from the ontogeny of C. 

 Elpenor and Porcelhis. 



Of the genus Chczrocampa? over fifty species 

 have been ^described, 4 of which the larvae of only 



* I unite the genera Pergesa and Darapsa of Walk, with 

 Chcerocampa, Dup. ; the first appears to me to be quite untenable, 

 since it is impossible that two species, of which the caterpillars 

 agree so completely as those of C. Elpenor and Porcellus, can 

 be located in different genera. Porcellus indeed was referred 

 to the genus Pergesa because of its different contour of wings, 

 an instance which distinctly shows how dangerous it is to 

 attempt to found Lepidopterous genera without considering the 

 caterpillars. The genus Darapsa also appears to me to be of 

 very doubtful value, and in any case requires further confirma- 

 tion with respect to the larval forms. 



4 [Mr. A. G. Butler (Trans. Zoo. Soc., vol. ix., part, x., 1876) 

 gives a list of about eighty-four species of Charocampa, and 

 sixteen of Pergesa, besides numerous other species belonging to 

 several genera placed between Charocampa and Pergesa. ' Of 

 Darapsa, he states " that this genus was founded upon most 

 heterogeneous material, the first three species being referable to 

 Hiibner's genus Otus, the fifth to Walker's genus Diodosida, the 

 sixth and eighth to the genus Daphnis of Hiibner, the seventh, 

 ninth, and tenth to Cfuzrocampa of Duponchel ; there therefore 

 remains only the fourth species, allied to Charocampa, but 



