188 MR. G. F. HAMPSON ON STRIDULATION [Mar. 1, 



or individuals possessed of more than one pair of ovaries we have 

 indications of a metameric reduplication of those organs similar to 

 that of the testes in the Hirudinea. 



A metamerically repetitional disposition of the ovaries is very rare 

 among worms generally ; in fact, it is only met vfith in the Platyhel- 

 minthes, the Cestoda and the Neraerteans both exhibiting it. Setting 

 aside the Cestoda as highly specialized, we find that the only worms 

 exhibiting the metameric reduplication of the ovaries are certain of 

 the Planarians. 



Beddard has shown in Eudrilus ^ that the condition of the oviducts 

 and their accessory structures, to quote his words, "suggests a 

 comparison with the corresponding organs in the Planarians, from 

 which group I am disposed (following Lang) to derive the Annelids." 



The facts which I have herein described and tabulated appear to 

 me to justify a belief in the potentially reproductive nature of the 

 individual somites of the Chsetopod body, and to support Beddard's 

 suggestion above alluded to. 



EXPLANATION OF PLATE XIII. 



Fig. 1. Abnormal Earthworm (Allolobophora, sp. iuc), dissected to show the 

 genitalia, X 3. The segmental organs and two posterior seminal 

 vesicles removed from the right side. 

 1-18, the somites ; sc/.o, the segmental organs ; m, the mesenteries ; 

 71.C, the nerve commissures; s.v, the seminal vesicles; sp, the sper- 

 mathectfi ; t, the testes ; /, seminal funnels ; v.d, the vas deferens ; 

 ov}-ov.'' , the ovaries ; ovd, the oviducts ; r.o, the receptacula ovorum. 

 2, Enlarged di-awings of the ovaries from the right side, X 10 ; drawn 

 with a camera hicida. 

 0., nearly ripe ova ; ov^-ov?, the seven ovaries. 



3. On Stridulation in certain Lepidoptera^ and on tlie Dis- 

 tortion of tbe Hind Wings in the Males of certain 

 Ommato'pliorinai . By G. F. Hampson, B.A. Oxon. &c. 



[Eeceived February 1, 1892.] 



When working at the Indian Moths of the family Aguristidce, 

 my attention was drawn by Mr. E. Y. Watson, of the Madras 

 Staff Corps, to the powers of stridulation possessed by the males of 

 JEgocera tripartita, Kirby, of whicli he had brought home a long 

 series from Burma. This Moth flies at dusk, and the males produce 

 a loud clicking sound audible at some distance off — click-click-click 

 at intervals of about a second. This led me to investigate the 

 subject in this species and in the only other Lepidoptera known to 

 produce the same sound — certain Butterflies of the genus Ageronia 

 and otber allied genera from Brazil. 



Tbe males of M. tripartita (fig. 1, p. 189) obviously differ from 

 those of all the other species of the genus in tbe possession of a large 

 patch of hyaline membrane denuded of scales beneatb the costa of 

 the fore wing, and this at once suggests itself as being connected 



^ " The Anatomy of Earthworms," Q. J. M. S. n. s. vol. xxx. p. 455. 



