xli 



that tins vine is still alive, in spite of the Phylloxerfe upon 

 its roots; retaining its verdure, though not in very thriving 

 condition from having been five years in the same earth and the 

 same pot. 



A species of Acarus (Tyroglyphus Phylloxerse, Eileij), which 

 preys upon the root-inhabiting type, has been discovered by 

 Mr. Eiley in America, whereof colonies are being introduced into 

 France ; but (as Mr. Riley considers) any expectations founded 

 thereon are " doomed to disappointment." The T. echinopus, 

 described by Dr. Fumoze and Prof. Ch. Eobin in 1868, has also 

 been found on the French vines (Ann. Soc. Ent. Fr., p. xcix., 

 1874). 



Another species of Tyroglyphus, met with abundantly on 

 Fungi, more especially on the Agaricus campestris, has been the 

 subject of an interesting communication by M. Meguin, published 

 in the Paris 'Journal dAuatomie et de Physiologic,' intituled 

 "Memoire Anatomique et Zoologique sur un nouvel Acarien de 

 la Famille des Sarcoptides, le Tyroglyphus rostro-serratus, et sur 

 son Hypopus," showing that the latter is but an adventitious 

 nymph-form of the former, which the octopod-nymphs assume 

 by moulting, when the Fungi become desiccated, resuming their 

 previous nymph-condition by another moult on the moisture 

 being renewed. This incidental heteromorphosis not extending 

 to other stages, the hexapod -larvae and adults are doomed to 

 perish under such circumstances, while the occult-nymphs, in 

 their Hypopus coat-of-mail, attach themselves to any insects that 

 come in their way, for conveyance to another suitable abode, 

 whereby the continuance of the race is provided for. 



A similar transmutation has been observed by MM. Riley and 

 Planchon in the Tyroglyphus Phylloxercne. 



The Colorado potato-beetle (Doryphora decem-lineata) is an 

 enemy whose rapid advances towards the shores of the Atlantic 

 threaten an invasion into Europe at no distant day. Mr. Riley 

 points out how these destructive insects, when once established 

 on the sea-board, may wing their way to vessels m port, being 

 accustomed to fly in swarms, and may thus be borne over to 

 found a colony in this country, irrespective of conveyance wi h 

 the tubers themselves, which they are stated to devour greedi y 

 when dug up, several having been found ^"f °^f ^"V^^,^?;"^ ^^ 

 potato. Mr Riley suggests that Agricultural and Horticultuial 



