xl 



2. That this is not the species which he had found on the 

 Kermes oak : 



3. That although the former subsists on the Quercus Kobur, he 

 expects to prove next year that both this species and the P. vasta- 

 trix resort to the Q. coccifera to deposit their pupce : and — 



4. That he has found another species sparsely associated with 

 these on the same oak and nurtured thereon, being met with not 

 only in the winged form, but also in the larval and pupal stages 

 (distinguished by having two cylindrical and retractile tubercles 

 between the antennie), on which he confers the name of P. Bal- 

 bianii.* 



With respect to the galls on the under side of certain vine- 

 leaves, less frequently met with in France than in America, and 

 having a fimbriated aperture from above, Mr. Eile}^ the State 

 Entomologist of Missouri, has long- since shown (Third Eej)ort, 

 1871) that the autumnal individuals emanating from these galls 

 descend to the roots, as subsequently verified by M, Signoret and 

 others; and more recently Mr. llileyf has obtained a leaf-gall 

 (which, however, subsequently proved abortive) from one of the 

 root-infesting type, which he defines as radicicola, in contra- 

 distinction to the other, which he designates as gallcecola. These 

 galls, tenanted by an agamic apterous race which never acquires 

 wings (formerly attributed to the ovipositing winged females), 

 Mr. Riley is now disposed to ascribe to the young hatched on 

 the roots, more extensive experience having satisfied him that 

 the presence of the gallcecola-type is not the invariable precursor 

 of the radicicola in an uninfected vineyard, nor in anj^wise essen- 

 tial to the continuance of the species. The same author, in a 

 paper recentlj^ read before the Academic des Sciences (December 

 14th), enumerates sixteen well-defined species of Phylloxera indi- 

 genous to North America; whereof only one is found on the 

 vines, and one (P. Eileyi) on the oaks ; the others being chiefly 

 met with on difi"erent species of Carj^a. 



It is, moreover, worthy of remark that M. Signoret has in- 

 formed the French Entomological Society (Sept. 23) that he still 

 possesses a potted vine, whereon his first experiments were made 

 in 1869 ; that every year he places on this vme the Phylloxerse 

 which are sent him, whether of the root or leaf-gall type; and 



* Compt. Eend., 5 Oct., 1874; p. 783. 



+ Sixth Report, 1874, p. 44 ; and App. 12, p. 69. 



