all 
XXX 
American stocks not subject to such attacks, which have success- 
fully resisted invasion by the Phylloxera in the most contaminated 
localities ; and which, as exempt from root-disease, may be advan- 
tageously grafted with any of the more susceptible and appreciated 
French varieties. 
The satisfactory progress of such experiments during the last 
two years has been brought to the notice of the French Ento- 
mological Society by M. Jules Lichtenstein, of Montpellier (14th 
July), and may be held sufficient to justify the belief that the use 
of such stocks will serve to re-establish the prosperity of viticulture 
in the South of France. 
The notion entertained by the last-named persevering observer— 
that the winged agamous females of the Phylloxera vastatrix resort 
from the vines to the Chermes oak to deposit their eggs or so-called 
pupe, has been shown to be so far fallacious, that, as Mr. Riley 
observes, this species of oak not existing in America, the Phyl- 
loxera must there migrate to some other tree; in which cases 
the sexual race derivable therefrom, as well as the progeny of 
the latter, being apterous, and having no means of returning 
to any distant vines, ‘must inevitably perish,” as in all other 
instances when, not unfrequently, borne away from their accus- 
tomed sites. On the other hand, the spreading of the disease 
from patch to patch, and from one locality to another, with un- 
molested intervals, has been plausibly ascribed to the progeny of 
the winged type when alighting on the vines; and indeed could 
hardly be effected otherwise. 
As regards the proper definition of the eggs or pupe deposited 
alike by the winged and apterous mothers of the sexual progeny, 
Mr. Riley terms them “ eggs or egg-like bodies,” and contends for 
the former appellation ‘‘ because, when first laid, they are trans- 
parent with homogeneous contents; while the sexual individual 
developes within the covering very much as the embryonic larva 
developes within the egg” (p. 91, note). M. Lichtenstein main- 
tains his former designation of pupe, as giving birth at once to 
the mouthless sexual race, without any intermediate condition; 
the tegument being also of a silky or cottony character, differing 
from the ordinary egg-shell.* 
The American potato-beetle—best known to Science as the 
Doryphora decem-lineata, although otherwise designated by 
* Vide Proceedings of Ent. Soc. Fr., July 14, 28, and Aug. 11, 
