206 . GENEEAL OEGANIZATION. 



stiff yellow setse. As in Machilis, the ovipositor consists 

 of four long rod-like appendages belonging to the eighth 

 and ninth segments. M. Lacaze Duthiers was quite 

 mistaken in asserting ^ that the ovipositor of Lepisma 

 had been overlooked by entomologists. On the con- 

 trary, it was described and figured, although not very 

 clearly or elaborately, by Treviranus," while that of 

 Machiliswas figured by Leach,^ Templeton,^ and Nicolet.^ 

 Grervais also has indicated the ovipositor in several of 

 his figures ;^ on the contrary, in the text he appears to 

 confuse the ovipositor with the central caudal ap- 

 pendage, for he says " le median, que Latreille a nomme 

 tariere, manque dans les Campodees," which he contrasts 

 in this respect with Nicoletia. The central caudal ap- 

 pendage in that genus, indeed, corresponds truly with 

 that of Machilis, which, however, is quite distinct from 

 the ovipositor, 



M. Lacaze Duthiers thus sums up his view of the ab- 

 dominal homologies in Lepisma : — " L'abdomen," he 

 says,^ " se compose de onze urites, example de plus a 

 I'appui de cette opinion, a savoir que le nombre normal 

 des urites n'est point neuf, mais bien onze. Les huit 

 premiers se composent d'un sternite et d'un tergite, 

 celui-ci embrasse le premier par ses bords qui descendent 

 tres-bas sur les cotes. L'ennaturite forme I'armure. 

 Le decaturite, represente par un tergite seulement, 

 s'avance an dela de I'anus, et cache I'origine des fila- 

 ments terminaux." 



"Enfin,rendecaturite est compose de plusieurs pieces 

 rangees autour de I'anus. On le voit done, l'abdomen 

 d'un Lepisme se compose absolument comme celui d'un 

 Orthoptere et d'un Neuroptere. L'Oviducte s'ouvi^e du 

 reste en avant de I'armure, entre I'hogdo et I'ennatos- 



1 'Ann. d. Sci. Nat.,' 1853, p. 37. 



- ' Verm. Schrif.,' vol. ii. 



^ ' Zool. Mis.' vol. iii. 



■* ' Trans. Ent. Soc.,' vol. i. 



s ' Ann. Soc. Ent. France,' 1847. 



^ 'His. Ins. Apt ,' pi. li, ficf. 7, pi. Iii, fig. 1, i, fig. 2, B. 



' 'Ann. dos JSci. Nat.,' 1853, p. 40. 



