﻿106 SEVENTH ANNUAL REPORT 



affecting the vine. The instrument used for introducing the liquids 

 intended to generate the destructive gases, is an augur with a hollow 

 shank, perforated just above the cutting portions. The liquid is 

 poured into the hollow portion of the augur from above the handles. 



NATURAL ENEMIES. 



It appears pretty certain that the mite I described last year as 

 preying on Phylloxera, is likewise found in Europe ; or at least a 

 ■species that cannot well be distinguished from it. Thus during the^ 

 year, M. A. Fumouze, an authority on these minute animals, has pub- 

 lished some notes showing that he has found this same Tyroglyph on 

 roots affected with Phylloxera in France, and that it is apparently the 

 T. echinopus described by himself and Ch. Robin in the Journal de 

 V Anatomie et de la Fhysiologie, in 1868. Prof. L. Roesler, of Klos- 

 terneuburg, Austria, also announced to me by letter that he has found 

 and studied both the Phylloxera Mite and the Mussel-shaped Mite 

 {Iloplophora arctata) on the infested vines of that place. He has 

 also observed, in addition, the larva of a Lace-wing ( Clirysopa') and 

 the Myriapodous Pollyxerus cagurus preying on Phylloxera under- 

 ground. 



In addition to the Weeping Lace-wing mentioned last year, I have 

 this year reared the Consumptive Lace-wing iChrysopa tahida^iich) 

 from larvae preying on the gall-lice. 



In reference to the heteramorphism of these mites M. Meguin 

 states* that Hypopus, Homopus and Trichodactylus are but hetero- 

 morphous pupae of different species of Sarcoptides, and among them 

 of Tyroglyphus. He proves that, as Olaparede observed in the aquatic 

 Atax, a new individual is formed under each skin, and all the parts 

 are developed anew, and not simply drawn out of their old envelopes, 

 as was formerly supposed. 



SUSCEPTIBILITY OF DIFFERENT VARIETIES. 



In addition to that already published under this head, I have sim- 

 ply to add that M. Eugene Morel, of Ridgeway, N. C, sent me last 

 August leaves of the Scuppernoug ( Vulpina) covered with the Phyl- 

 loxera galls, so that this species can no longer be considered exempt 

 from the attacks of the gall-making type, though the more injurious 

 root-inhabiting type has not yet been found upon it. The " Tele- 

 graph " should be taken from the list of Summer grapes (cestivalis) 

 and placed with the Northern Fox {Lahrusca); and the Delaware 



• Comptes Rendus de V Ac. des Sc, Paris June 8, 1878. 



