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Malenotti (E.)- Sopra un caso di endofagia dell' " Aspidiotiphagus 

 citrinus " (Craw) How. sul " Chrysomphalus dictyosfermi " (Morg.) 

 Leon. [A Case of Endophagy of Aspidiotiphagus citrinus, Craw, 

 on Chrysomphalus dictyospenni , Morg.] — Redia, Florence, xii, 

 no. 1-2, 25th April 1917, pp. 15-18. 



This is a record of the parasitation by Aspidiotiphagus citrinus 

 of Chrysomphalus dictyospermi on Sanseviera arbor escens in the green- 

 houses of the Colonial Agricultural Institute at Florence. This 

 parasite has not been noted on citrus plants growing in the open. 



Cavazza (C). Seconda Serie di Esperienze interno all' Influenza di 

 alcuni Agenti Chimici sul Bombyx mori. [A second Series of 

 Experiments on the Influence of some Chemicals on Botnbyx 

 mori.] — Redia, Florence, xii, no. 1-2, 25th April 1917, pp. 69-107. 



This paper records the action of various chemicals on the develop- 

 ment and reproductive powers of Bombyx mori. 



Del Guercio (G.). Contribuzione alia Conoscenza degli Aphidi. [A 

 Contribution to the Knowledge of Aphids.] — Redia, Florence, xii, 

 no. 1-2, 25th April 1917, pp. 197-277, 3 plates. 



This paper is chiefly systematic and contains keys to the genera and 

 species of many European, African and American Aphids ; many of 

 these are of economic importance, whilst others are new, or have been 

 insufficiently described. It is pointed out that the mere record of the 

 presence on foreign plants of a noxious species may prevent its spread 

 by putting importers on their guard. 



Francoa elegans, gen. et sp. n., occurs on roses in Italy. A key is 

 given, enabling this genus to be distinguished from Rhopalosiphum, 

 Koch, and Siphocoryne, Pass. When noticed in June, it appeared to 

 do more severe damage than Macrosiphum rosae, De G., or Myzus 

 rosarum, Kalt. Anuraphis pcrsicae-niger. Smith (black peach aphis), 

 has been noticed in Italy on peaches of American origin, the injury 

 being quite as severe as in Colorado. Imported plants infested with this 

 Aphid should be immersed in tar oil, 3|-5 gals. ; commercial soda 

 (Na CO ), 20 lb. ; and water, 45 gals. The soda is dissolved in 5 gals, of 

 boiling water and this solution is poured into a cask containing the tar 

 oil and well mixed, after which the remaining 40 gals, of water is added 

 and the whole is stirred again. The plants should be completely 

 immersed and moved about in the liquid for 10 minutes, and this will 

 destroy the eggs of any Aphid living on cultivated plants. If peaches 

 have already been planted, a nicotine-soap spray is required. To 

 prepare this a handful of fine ash is put in 5 gals, of water and 1\ lb. of 

 tobacco extract is diluted in the liquid to which a further 40 gals, of 

 water is then added. In a separate container 7| lb. of soap is dissolved 

 in 5 gals, of boiling water and this solution is mixed with the first one. 

 Two sprayings are required, with a week's interval between them. 

 If A. persicae-niger is the species present, the roots must be laid bare and 

 sprayed also. 



In order to facilitate the identification of the numerous species 

 belonging to the genus Aphis, L., the author divides it into subgenera. 

 As one of these, Uraphis, includes species with cylindrical and clubbed 



