568 EXPERIMENT STATION RECORD. 



pure aisenite of lead v. arsenate of lead mixture (containing in reality only about 50 

 per cent chemically pure arsenate of lead) show the relative superiority of the latter. 

 The specific gravity of the arsenite of lead is much greater than that of the arsenate, 

 and for this reason it can not be so evenly applied to the foliage. . . . The experi- 

 ments with barium arsenate in 1896 gave so good results that we were hopeful that 

 this insecticide would prove superior to lead arsenate. Its killing effects on larva? 

 in confinement are certainly superior to those of arsenate of lead. In the field spray- 

 ing operations it was found that the poison did not adhere to the foliage for a suffi- 

 ciently long time to kill the larva'. With the lessening of the cost of arsenate of 

 lead we have now effected, barium arsenate can noc compete with it." 



Pbenolate of lead liad no effect on larva? or foliage. Di-plumbic 

 arsenate seemed equal if not superior to tri-plumbic arsenate. 



Some spraying mixtures, G. W. Cavanaugh (New York Cornell 

 Sta. Bui. 149, pp. 719-721). — Chemical examination of 5 samples of Paris 

 green sbowed from 54.32 to 55.32 per cent of arsenic, and an analysis 

 of English purple sbowed 30.75 per cent of arsenic and 5.30 per cent of 

 arsenic soluble in water. Two samples of Paris purple gave a total of 

 34.1 and 47.05 per cent of arsenic and 13.88 and 11.80 per cent of arsenic 

 soluble in water. 



An analysis of laurel green gave 10 percent copper and 7.75 per cent 

 arsenic (As 2 3 ). Several analyses of Bug Death are given, which show 

 that it contains no arsenic, but is made up of zinc 70.5 per cent, lead 

 9.8, and iron oxids 7.8 per cent, a very small amount of phosphoric acid 

 and potash (2 per cent). The last 2 constituents give Bug Death a 

 slight fertilizing value. 



Animal parasites, R. Helm (Producers' Gaz. and Settlers' Bee. [ West Australia], 5 

 (1S9S), Xo. 3, pp. 189-194, Jigs. 7). — A description and life history is given of hot Hies of 

 cattle (Hypoderma boris and Hypoderma lineata) and camel bot (Cephalomyia 

 maculata). 



The evolution of Hypoderma bovis, according to new investigations, 

 L. Gedoelst (Rev. Gin. Agron., 7 (1898), Xo.ll,pp. 492-496). 



The life history of Hypoderma bovis, Schneidtkmuhl (Centbl. Bakt. u. Par., 1. 

 Abt., 24 (1S98), Xo. l,pp. 30, 31). 



The Buffalo gnats, or black flies, of the United States, D. W. Coquillett 

 ( U. S. Dept. Agr., Division of Entomology Bid. 10, n. ser., pp. 66-69, figs. 2). — Descriptions 

 and synopsis of the family Siinuliidae. 



Further notes on the house fly, L O. Howard ( U. S. Dept. Agr., Division of Ento- 

 mology Bui. 10, n. ser., pp. 63-65). — Experiments iu mixing various substances with 

 horse manure in order to prevent the breeding of house flies in it are reported. It 

 was found that nothing was to be gained by the use of air-slaked lime, land plaster, 

 or gas lime. Both chlorid of lime and kerosene were successfnly used, and the 

 author expresses the belief that the latter is an easy and cheap method of treating 

 manure piles to prevent the breeding of house flies. 



The cecidomyids of cereals and their parasites, P. Marchal (Ann. Soc. Ent. 

 France, 66 (1S9S), Xo. l,pp. 1-10,',, pis. 8, figs. 9; abs. in Zool. Centbl., 5 (189S), Xo. 18-19, 

 pp. 618-620). — Studies were made of Mayetiola (01 igotrophus) destructor, M.avenw, 

 Cecidomyia cerealis, C. culmicola, C. frumentaria, Diplosis tritici, D. mosellana, D. 

 equestris, D. marginata, D.jlara, D. cerealis, Lasioptera cerealis, and Epidosis cerealis; the 

 most of the studies being made on the first species. 



Among the parasites mentioned are: Triads remiilus, Polygnotus minutus, P. zozini, 

 Eupelmus atropurpureus, Merisus destructor, and Homoporus laniger. 



