Transactions of the Linnean Socictt/. 583 



are given of several tracheae of Ducks, including that of the Anas 

 rufinay Pall., and of the free and lobated hind toes, which serve 

 partly to characterize the proposed divisions. 



The memoir " On two new Genera of Land Tortoises ; by 

 Thomas Bell, Esq., F.R.S., &c.," may be regarded as an appendix 

 to the '•'' Monograph of the Fresh-water Tortoises having a move- 

 able Sternum,*' by the same authour, which appeared in the second 

 volume of our Journal. In that paper Mr. Bell remarked, that 

 the species of Terrapene would be found to constitute the interme- 

 diate affinities connecting the fresh-water with the land Tortoises. 

 Among the latter he had however at that time been unable to detect 

 any one possessing the slightest approach to the moveable struc- 

 ture of the sternum, which formed so prominent a character in the 

 animals then under his considevation. Subsequent researches have 

 shewn the correctness of his anticipation that such would eventu- 

 ally be discovered, by placing in his possession a true land Tor- 

 toise, in which the anterior lobe of the sternum is moveable, and 

 he hay also obtained specimens of two other.s in which a yet more 

 curious conformation exists in the posterior portion of the dorsum 

 ibeing moveable on the anterior. The former is the type of his 

 new genus Pi/xis, a.nd is described and figured under the name of 

 P. arachnoides; and the two latter constitute the other new- 

 genus, Kinyxis, Both the latter are natives of Africa, and one of 

 them, the Kin. castanea, " sterno antice ultra testam superiorem 

 prominente : scutis marginalibus 23," lived for some tipe in Mr. 

 Bell's collection. The second species, the Kin, Homeana^ is 

 thus characterized, " K. dorso postice gibbo : scuto marginali 

 antico imparl." Figures of each of the species accompany the 

 communication, 



" The Natural History of Oiketicus, a new and singular genus 

 o{ Lepidoptera : by the Rev. Lansdown Guilding, B.A., F.L.S.,'* 

 describes two very extraordinary insects, the perfect females of 

 which are not only entirely apterous, but never even quit the 

 puparium ; receiving in it the embraces of their males, and de- 

 positing their eggs within its cavity. In their larva state they also 

 exhibit another curious phaenomenon, which however is not un- 

 precedented even among the Lepidoptera^ that of inhabiting 



