603 



RiABov (D.). OnepeAHoe MaccoBoe nofleneHie sHMHeii nflA^HHiibi. 



[The next periodic outbreak of Cheimatobia brumata.] — « flpo- 

 rpecCMBHOe CaflOeOflCTBO M OropOflHHneCTBO. [Progressive Fruit- 

 Growing & M(irkel-G(irdening\ Petrograd, no. 25, 4th July 1915, 

 pp. 721-722. 



The author refers to the regular periodicity in the occurrence of 

 outbreaks of various pests, and is of opinion that a large outbreak of 

 Cheimatobia bntmata is due to take place in South Russia in 1916. 

 The last great outbreak of this pest in the governments of Poltava 

 and Charkov occurred in 1905 and 1906. Since then it has not 

 appeared in great luunbers, but signs of the impending outbreak were 

 observed in the woods in the government of Charkov, many oaks, 

 limes, pears, etc., having been totally defoliated. 



Samma pacieHiil OTTj BpeAMiencil. [Protection of plants from pests], 

 no. 1 (19). — Supplement to « JlK)6MTe/lb npMpoflbl.» [Friend of 

 Nature], Petrograd, 1914, 16 pp. [Received 21st August 1915.] 



The following two articles relating to Entomology are contained in 

 this number : — 



MoRiTZ L. MsTj Ha6jlK)fleHiil Hafllj capaHHetl. [Observations on 

 locusts], pp. 1-7, 6 figs. 



The chief breeding places of locusts in the province of Terek are 

 situated on its eastern border, in the reeds along the Caspian Sea. In 

 1913 the hatching of Locusta {Pachytglus) wigraforia, L., began on 

 20th May and continued till about the middle of June. The adults 

 began to appear about the 28th June. The migrations proceeded 

 from south-east to north-west, coinciding with the direction of the 

 large growths of reeds. Frequently they also moved with the wind 

 or in the direction of the sun. Oviposition began on 20th September, 

 and in the first half of October the pest gradually disappeared. Enemies 

 of locusts observed, include rooks {Corvus frugilegus)^ Pastor roseus 

 and Sturmis vulgaris, eagles of the genus Aquila and also swamp 

 tortoises [Emys orbicularis), which were seen to destroy the larvae 

 passing across an irrigation channel. About 6 per cent, of the locusts 

 were infested with larvae of a Tachinid fly and a mite of the genus 

 Trombidium was also observed to parasitise them, usually at the base 

 of the wings. Larvae of Cantharidae were frequently found in the 

 egg-clusters devouring the eggs. The chemical method gave good 

 results, especially sodium arsenite with zinc oxide, which caused death 

 a day after the locusts had devoured it ; the eft'ect of Paris green with 

 lime was slower and was only noticeable after two days. The poison 

 affected individuals of the first two stages more rapidly. 



Plotnikov (V.). Ktj SionorJH MapTOBCKaro xpyma. [On the biology 

 of Mehntha affiicta. Ball], pp. 7-10, 2 figs. 



Melolontha affiicta. Ball., and M. clgpeala, Rott., which is found 

 far less frequentlv, replace in Turkestan the European species 

 M. melolontha, L., and M. hippocastaui, F. The life-history of 

 M. affiicta dii?ers greatly from tliat of the European species and it 



