VI PKEFACE. 



Aphides, Scale Insects, &c. [Homoptera). 



American Blight, Scltizoneura lanigem Apple-barli. 



Beech /ii^his, Pliy I hqjhisfagi Under Beecli-leaves. 



Cherry Aphis, Blyzus cerasi Cherry-leaves and slioots. 



Currant Green Fly, Rhopalodphum ribix Currant-leaves. 



Currant and Gooseberry Scale, Lecaiiiuin iHii.-:. . Currant- and Gooseberry-shoots. 



Currant White Woolly Scale, Pulviiutria ribesiic . . . Currant-shoots. 



Grain Aphis, Siphonophora granaria Corn and Grass. 



Mealy Bug, Coccus adoniduin Vines, &c. 



Snowy Fly, Cabbage, Alegrodes prolctclla Cabbage-leaves. 



Of Thysanoptera, we had the Coin Thrips, known with us as 

 the Thrips (Umotlinps) ccrealiumoi Hahday, and the "Black" 

 Thrips, the Thrips {Hcliothrips) Immorrhoklalis, on Vine-leaves. 



Of other serious plant infestations not of insect kind, we had 

 the Stem, Beet, and Root-knot Eelworms, respectively the Tylen- 

 chus devastatiix, Heterodera Schachtii, and H. radicicola. Spring- 

 tail, Siiiynthurus lute as, on Turnip-leaves. Of Acari, Red Spider, 

 Tetranychus telarius, on Hops ; and Bryohia pratiosa, on Goose- 

 berry ; also Hay Mites, Tyroglyphus longior ; and the Gall Mites, 

 Phytoptus ribis, in Black Currant-buds; and P. pyri in Pear- 

 shoots. 



Very many other infestations were enquired about, of which 

 the enumeration would be too tedious ; but it may be just 

 mentioned that this included various tropical attacks, as to 

 Sugar Cane, Tea, Orange, &c., in various parts of the world; 

 and notably an infestation of Chafer or Lamellicorne Beetles at 

 grass-roots over the vast area of 40,000 acres of pasturage on 

 land in the Argentine Territories of South America.* 



These various matters I attended to, to the best of my power, 

 and preserve the record of, with date, and name of sender of 

 enquiries, in the daily entries in my letter-books; and where 

 the subject is of importance (and in many other cases), my con- 

 tributors' letters are also preserved. 



In my work I am greatly indebted for assistance in difficult 

 points of identification to the kind help of skilled colleagues, and 

 amongst these, during the past year, I desire particularly to 

 thank Mr. R. H. Meade, of Bradford, for help in identification of 

 Diptera; Dr. J. Ritzema Bos, Professor at the State Agricultural 

 College, Wageningen, Netherlands, for assistance in the difficult 

 study of Nematodes, or Eelworms; and to Prof. J. Jablonowski, of 

 the entomological staff of the Government Entomological Station 

 at Budapest, Austria-Hungary, I am much indebted for colleague- 

 ship in economic entomological work and technical information 

 regarding the plant pests known with us as Thrips. To these 

 friends, and other friendly helpers amongst the economic and 



■'^ From specimens sent me, which were kindly identified for me by Mr. 

 0. E. Janson, F.E.S., these proved to be of the Diloboderus abderus, and of 

 the Eucranium arachnoides and Megathopa violacea, on which I have 

 given a short paper, with figm-es, in the ' Entomologist ' for August, 1894, 

 pp. 229—232. 



