389 



PaDALKA (V.). CnMC0HT»TENTHREDINIDAEC06paHHblXT> BT* JlymCKOM-b 



ytsAt nerporpaACKOM ry6epHiii m HtHOTopbm 6ionorii4ecKifl 

 Ha6/lK)AeHifl HaAl* HMMM. [A list of Tenthredinidae collected 

 in theLuga district of the govt, of Petrograd and some biological 

 observations on them.]— « PycCKOe dHTOMOnorMHeCKOe 06o3pt- 



Hie.» [Revue Riisse (TEntomologie], Petrograd, xiv, no. 4, 23rd 

 January 1915, pp. 460-472. 



This is a list of 108 species of Tenthredinidae and five species of 

 Lydidae collected near Luga in the government of Petrograd during 

 several years ; the plants on which the insects or their larvae were 

 found are named, and in some cases a more or less full accomit of the 

 life-history of the insects is given. Amongst those more fully dealt 

 with are : Emj^hytus cingulatus, Scop., which is numerous in the first 

 half of July ; 8-10 eggs are laid inside each of the petioles of leaves of 

 strawberries ; a description is given of the larva, which had been recorded 

 by Konow as Cladius difformis, Panz. ; they pass the winter in the 

 soil, in cocoons, pupating shortly before the appearance of the imago. 



The eggs of Prisiiphora ruficornis, Oliv., were found during the first 

 half of May, being deposited along the main and side veins of the 

 lower sides of leaves of Rtbes rubrum and R. grossidaria ; the eggs 

 are laid in groups of 12-25 and rest on the surface of the leaves ; 

 the larvae hatch out at the end of May and feed on the leaves. 

 Between the 6th and 13th July, all the larvae passed into the soil, 

 and pupated underneath the bushes at a depth of about 2 inches. 

 In the middle of July, the imaghies of the second generation appeared, 

 the lar\^ae of which totally defoliated the bushes and entered tlie soil 

 to a somewhat greater depth at the end of August ; the larvae winter in 

 cocoons 5-7 mm. long, and pupate 1-2 weeks before the exit of the imago. 



The eggs and quite young larvae of Trichiosoma vitaUinae, L., 

 {Lophyrus rufus, Retz.) were found in a pine wood on 25th May on 

 branches of an old pine, on the tip of the shoots of the previous year. 

 The various stages of the larvae are described. After the fifth moult, 

 they proceeded about the middle of June to weave cocoons on the 

 groimd, or in some cases on the shoots of the trees ; the cocoons are 

 originally white, but after 24 hours take on the colour of the buds of 

 the pines. The imagines appeared about the middle of August. The 

 eggs are laid in groups of 5-8 eggs on each needle, and the winter is 

 passed in the stage. 



The larvae of Cimbex femorata, L., were frequently found on birch 

 in June, while the adult larvae of the variety, silvarum, F., were found 

 on birch in large numbers in July ; in August, the larv^ae weave 

 cocoons, attaching them to the branches and wintering inside them, 

 pupating not long before the issue of the imago. The larvae are 

 largely subjected to attacks by parasites ; out of 65 larvae, 14 were 

 infested with parasites, 2 of them being Tachinids. 



DiNDON (P.) Kyjibiypa paHHeii KanycTbi e-b rpyHiy. [The open 

 ground cultivation of early cabbage.] CaAOBaH BllSniOTeKa 

 [Orchard Librari/\ supplement to « riporpecCMBHOe CaAOBOACTBO 

 M OropOAHMMeCTBO.» [Progressive Horticulhire and Market- 

 Gardening], Petrograd, 1915, 31 pp., 15 figs. 

 An accoimt of the hfe-history of, and the remedies for, the 



