433 



A. pusilla is recorded from potatoes, Spiraea nlmaria, Hyoscyamus 

 niger, Galeopsis versicolor, Stachys silvatica and Euphorbia ; A . sciitellata 

 from Vicia cracca and V. faha. They had not been recorded hitherto 

 from Graminaceous plants, but the author found the larvae exclusively 

 on oats, except that the third generation was induced to lay its eggs on 

 winter rye and wheat owing to the scarcity of the usual food-plant. 

 The larvae eat out the parenchyma of the leaves along the veins. The 

 eggs are laid singly under the epidermis ; the beginning of the larval 

 mines was noticed 3-5 daj/s after oviposition. The larval stage lasts 

 from 5-7 days ; when fully grown the larvae emerge from the mine and 

 pupate in the ground at a depth of one centimetre. Pupation takes 

 three weeks or longer. In captivity the adults live from 5-7 days, 

 seldom longer. During 1920 three generations occurred, the first 

 adults appearing at the end of May and beginning of June, the next from 

 23rd July, and the third about 25th August, the numbers decreasing 

 suddenly after 7th September. About 20 per cent, of the leaves 

 were attacked by the first generation, the infestation falling later 

 to about 8-9 per cent. Some of the pupae of the first and second 

 and all of those of the third generation overwintered. The larvae 

 are heavily infested by Chalcids and Braconids, about 45 per cent, 

 of the first generation and about 90 of the second being parasitised. 



a' lateralis is recorded from rye and timothy. On the latter 

 another species of Agromyza was also found. Larvae belonging to the 

 genus Anthomyia were found mining in the leaves of Datura stramonium 

 and Polygomcm sp. 



Troitzky (N. n.). KanycTe, KanycTHoii iwyxe m KMjie. [About 



Cabbage, ChortophUa hrassicae and Plasuwdiophora brassicae] — 



TpyAbi 2ro BcepoccMiicKoro SHTOMO-OmonaTonorMHecKoro CijesAa 



B neiporpaAe, 20-30 OkTaQph 1920 rOAa [Proc 2nd All- Russian 

 Entomo-Phviopath. Meeting in Petrograd, 25th-30th October 1920], 

 Petersburg, '1921, pp. 165-177, 6 figs.' [Received 21st June 1922.] 

 Cabbages are a very important crop in the north of Russia, and are 

 also extensively used in crop rotation. Great damage is caused by 

 Phorbia [ChortophUa) brassicae, Bch., especially at the time of trans- 

 planting. As it is almost impossible to free the roots of the seedlings 

 entirelv from the larvae and eggs, disinfection with the following 

 substances has been tried :— Quassia, quassia and green soap, green 

 soap alone, tobacco extract, and kerosene emulsion. The plants were 

 dipped with the surrounding earth into the insecticide until the earth 

 was saturated, after which they were transferred to the field. The 

 harvest from the disinfected plants, particularly those treated with 

 quassia, was greatly increased in comparison with untreated plants. 

 Kerosene and tobacco apparently retard the growth of the plant. 

 The treated plants also suffered less from the fungus, Plasmodiophora 

 brassicae. 



MoDESTov (V. v.). K Bonpocy o6 opraHMaaituM (DeHOJiornMecKiix 



Ha6nK)A6HMM. [On the Question of the Organisation of Pheno- 



logical Observations.] TpyAbi 2ro BcepoccMMCKoro Shtomo- 

 (DuTonaTOJiornHecKoro C-besAa b neiporpaAe, 25-30 OkthSph 



1920 rOAa [Prof. 2nd All- Russian Entonio-Phytopath. Meeting in 

 Petrograd, 25th-30th October 1920], Petersburg, 1921, pp. 178-180. 

 [Received 21st June 1922.] 

 Attention is cahed to the importance in entomology of a systematic 

 study of the effect of climatic conditions. 



