506 



The rose midge [Neocerata rlwdophaga] has caused serious losses, 

 particularly in 1919, to roses grown under glass in Ontario, and the 

 value of tobacco dast was demonstrated. Tons of this dust have been 

 used in Ontario, and in 1920 results proved that the investigations 

 were worth ^(^ 10,000 to the growers. 



Hopkins (A. D.). U.S. Bur. Ent. Intercontinental Problems in 

 Bioclimatics ; with special Reference to National and Artificial 

 Distribution oJ Plants and Animals. — Jl. Wash. Acad. Sci., Wash- 

 inoton, D.C., xi, no. 10, 19th May 1921, pp. 223-227. [Received 

 22nd August 1921.] 



The principles on which the bioclimatic law is founded, and some of 

 the features in the system of application, are apparently not generally 

 understood. In consequence its scientific and practical value is often 

 underestimated, and the author therefore repeats his interpretations 

 [R.A.E., A, viii, 87]. 



Hopkins (A. D.). Bioclimatic Zones of the Continents ; with proposed 

 Designations and Classification. — //. Wash. Acad. Sci., Wash- 

 ington, D. C, xi, no. 10, 19th May 1921, pp. 227-229. [Received 

 22nd August 1921.] 



This paper designates and classifies bioclimatic zones for the con- 

 tinents of the world as suggested in connection with the previous 

 paper. There are three major zones — the Frigid, Temperate and 

 Tropical — which are divided into four, seven and four minor zones 

 respectively. The minor zones may be divided into sections and 

 sub-sections if necessary. 



Del Guercio (G.). Note ed Osservazioni di Entomologia agraria. 

 Notizie preliminari. [Notes and Observations on Agricultural 

 Entomology. Preliminary Notes.] — Florence, Istituto Agricolo 

 Coloniale Itahano, 1918, "282 pp., 230 figs., 1 plate. [Received 

 14th September 1921.] 



Some results of the author's original observations and studies on 

 injurious and beneficial insects are collected in this fully illustrated 

 volume. Many of the papers have been already noticed [R.A.E., 

 A, vi, 488, 530; vii, 16, 125, 193; viii, 159, 202, 203, 204]. 



Spermophagus subfasciatus and Bruchus {Bruchidius) ohtectiis, 

 infesting beans in Italy [vi, 382 ; ix, 281], were observed to be infected 

 by a bacillus of the group causing dysenteric septicaemia. The artificial 

 diffusion and economic value of this bacillus are to be studied. A 

 fiacherie was noticed in Cecidomyiid larvae infesting very young pear 

 fruits, in a large number of which 80-90 per cent, of the larvae were 

 infested with the bacillus, which was also found in larvae in the ground. 

 An injurious gall on Asclepias sp. received from Eritrea harboured a 

 Cecidomyiid for which the name MonilipenncUa trapczospatha, gen. et 

 sp. n., is suggested. An undetermined Cecidomyiid and its parasite, 

 probably Inostcmma sp., were obtained from galls on Solanum melon- 

 gena from Eritrea. This is of great economic importance as the egg- 

 plant is extensively cultivated in Italy, and plants with galls do not 

 bear fruit. It is possible that the eradication of the wild food-plants, 

 probably Solanaceae, will prevent infestation of the cultivated species. 



