458 Mr Brindley, Regeneration in Samia ailanthus. 



Regeneration in Samia ailanthus. By H. H. Brindley, M.A., 

 St John's College. 



[Received 16 June 1902.] 



The subject of regeneration in Lepidoptera has in only a few 

 cases received systematic and experimental study. Rdaumur 1 

 seems to have been the first to investigate the effects of mutilating 

 the larval legs on those of the imago, but the number of cases he 

 described, as well as those of Melise 2 and Watson 3 , who made 

 some observations on Sericaria and Dicranura respectively, are 

 too few to throw much light on the extent to which the features 

 of regeneration in lepidopterous insects compare with what is 

 known regarding regeneration in other Insecta and in Arthropods 

 generally. Newport's 4 experiments on Aglais and the recent work 

 of Chapman 5 on Liparis are much fuller, and furnish at least an 

 indication that the results of a particular injury to the appendage 

 of an insect with complete metamorphosis are much less constant 

 than is the case in those Insecta and other Arthropoda which 

 attain sexual maturity through a series of ecdyses. It is now 

 fairly well established that the regeneration of an appendage of 

 an Arthropod is a highly specialised process 6 . The new growth 

 may be apparently the close counterpart of the normal, or it may 

 be an alternative structure of specialised form, such as the 4-jointed 

 tarsus of Blattidae and Phasmidae and apparently the few jointed 

 antenna of some Collembola, or in exceedingly rare cases (two or 

 three Malacostraca and doubtfully some Insecta) the new appendage 

 may assume the form of another appendage with which it is in 

 serial homology 7 . Setting aside the last-mentioned exceptional 



1 Mim. de VAcad. des Sci., 1712, p. 223, and 1718, p. 263, and Memoires sur les 

 Insectes, 1734, p. 365. 



2 Ann. de la Soc. Entom. de Belgique, 1879, xxn., C. E., p. xcii. 



3 Entomologist, 1891, xxiv., p. 108. 



4 Phil. Trans., 1844, and Mag. Nat. Hist., 1847, xix., p. 145. 



5 Entomol. Record, 1900, xn. pp. 141 and 177. 



6 Brindley, for summary and bibliography, P. Z. S., 1897, p. 903, and 1898, 

 p. 924; Morgan, "Regeneration," New York, 1891; and Przibram, Arbeit. Zoolog. 

 Institute, Wien, 1899, xi., Heft 2; Archiv f. Entioiekelungsmech., 1902, xiii., Heft 4; 

 and Zool. Anz. 1902, xxiv., no. 661, for records later than P. Z. S. cited. 



7 Bateson, " Materials for Study of Variation," 1894, and P. Z. S., 1900, p. 268 ; 

 Herbst, Archiv f. Entwickelungsmech., 1896, n. p. 544, and Przibram, Zool. Anz. 

 xix., 1896, p. 424. 



