438 EXPERIMENT STATION KECORD. 



einuLsiou was Ibuiul to be the best means of killing tbein. It is believed 

 that the numbers of the pest will soon be mucli lessened thiougli the 

 action of ])ar:isites. 



The "flaxseed stage" of the Hessian fly, A. Laboulbene {Gompt. 

 Rend., 119 {1804), No. 4, pp. 2!)7-300). — jSTotes on the metamorphoses of 

 C('ci(lonii/i(t destructor, and upon the puparium, or envelope, of its larva 

 before transforming to a chrysalis. Microscopical examination shows 

 that before- the formation of the flaxseed stage there is a moist exuda- 

 tion, after which the body becomes rigid and brown. Treatment with 

 caustic potash renders the flaxseed less opaque, and permits recogni- 

 tion of the granules of the integument, and, without great diflftculty, of 

 the larval stigmata. The author concludes that it is by a molt, with a 

 considerable thickening of the pre-existing skin, that the larva of the 

 Hessian fly encysts itself. The previous chemical examinations of 

 Giard show that the substance of the flaxseed is identical with that 

 which constitutes the tegumentary envelope of the larva, and that it 

 offers the characteristic reactions of chitin, especially by complete resist- 

 ance to the action of concentrated and even boiling solutions of chlorid 

 of zinc and potash. — l. o. Howard. 



The scale insects attacking citrus fruits, and methods of com- 

 bating them, U. DEL GUERcao {kStaz. S2)cr. Ayr. Ital.,x^4 (L'^Oo), Xo. (I, 

 pp. 57 3-592, jigs. 6). — Illustrated descriptive notes on Mytilaspis fulva, 

 Aspldiotus Umonii, Lecamum liesperldum, L. citri, Dactyhtpiufi citri, and 

 Aonidia aurantU, with remarks on their life history and ravages and 

 experiments and recommendations for treating them. Kerosene and 

 soap emulsion and an enuilsion of carbon bisuli)hid and soapsuds were 

 tried, as also a heavy petroleum oil in dift'erent combinations with soap 

 and water. Several styles of spraying api)aratus and nozzles were 

 tried, and the Vermorel nozzle preferred. The heavy petroleum oil is 

 considered to give the best results, applied in the following mixture: 

 Petroleum oil 2 lbs., soap 2.4 lbs., water 1)8 qt. 



Further notes on scale insects (Coccidae), T. 1). A. Cockerell 

 {Cunad. Ent., 1894, Oct., pp. 284-288). — This describes as new Tachardia 

 cornuta, a lac insect, and Dactylopius .solani, a mealy bug on potato 

 tubers, both from New Mexico. Orthczia aitna' is recorded from 

 Arizona, Phenacoccus helianthi from Texas, and Diaspis lanatus from 

 Ceylon. The natural enemies of Phenacoccus helianthi are noted, and 

 Aspidiotus convexus is discussed. 



Insects injurious to stored grain, R. H. Price {Texas Sta. Bui. 31, 

 pp. 403-472, fias. 7). — This bulletin contains compiled information ui)on 

 several species of grain-infesting insects, with notes on their occur 

 rence in the State and recommendations for treatment. The following- 

 species are described and life histories given: Granary or corn weevil 

 {Calandra granaria), rice weevil (C. oryzw), four-spotted bean weevil 

 {Bruchus 4-macuh(t((}, bean weevil {B. obtectus), new bean weevil (/>. 

 rujirmanus), pea weevil {B. pisi), grain beetle {Silvanns surinamensis)^ 

 and Angoumois grain moth {Gelechia cereallela), 



