263 



rain, oviposit repeatedly in the punctures due to C. assiniilis and 

 allied weevils, the ovipositor of the midge being inadequate to pene- 

 trate the undamaged shell of the pod. The period required from 

 oviposition to larval maturity is about four weeks. Pupation in a 

 soft cocoon covered with sand takes place in the ground at a depth 

 of i-3-|- in. The observed food-plants include rape, turnip, radish and 

 mustard. There are several annual generations. Damp in conjunction 

 with warmth, and the presence of C. assiniilis, are factors favourable 

 to increase of this midge. The larvae are attacked by fungi and by 

 three Chalcids, and the eggs by a Proctotrupid, Platygasier sp. 



Thieim ( — ). Zur Bekampfung des Schwammspiimers. [On the 



Control of Porthetria dispar.] — Mitt. Biol. Reichsanst. Land- u. 

 Forstwirtsch., Berlin, no. 21, December 1921, pp. 217-219. 

 [Received 13th March 1922.] 



Porthetria [Lymantria) dispar is common in the low-l}dng Vistula 

 region south of Marienwerder in West Prussia. The measures adopted 

 are the destruction of the eggs with petroleum and the collection of the 

 larvae, pupae and adults. 



Seeliger ( — ). Zur Frage der Polleniibertragung durch den Raps- 

 glanzkafer von botanischem Standpunkte. [On the Question 

 of Pollen Transference by Meligethes aenens from the Botanical 

 Point of View.] — Mitt. Biol. Reichsanst. Land- u. Forstwirtsch., 

 Berlin, no. 21, December 1921, pp. 224-229, 2 figs. [Received 

 13th March 1922.] 



The conclusion reached is that Meligethes aeneus, F. (rape weevil) 

 is probably beneficial in that it assists pollination. 



WoLLENWEBER ( — ). Beitiage zur Aelchenfauna der Kartoffel. 



[Contributions on the Nematode Fauna of the Potato.] — Mitt. 

 Biol. Reichsanst. Land- ti. Forstwirtsch., Berlin, no. 21, December 

 1921, pp. 258-266. [Received 13th March 1922.] 



This paper includes a description of a new Nematode, Rhahditis 

 cryptocercoides, found in canker-infected potatoes from Bonn. 

 Another species, Atractonenia gibbosiini, Leuck., parasitises the larvae 

 of a fly, Sciara sp. 



Versuche zur Bekampfung der Oelfruchtschadlinge. [Experiments in 

 the Control of Oil-crop Pests.] — Mitt. Biol. Reichsanst. Land- u. 

 Forstwirtsch., Berlin, no. 22, December 1921, 49 pp. [Received 

 13th March 1922.] 



Of the five reports in this publication two, by Dr. Lang and Dr. 

 Rabbas, have already been noticed [R.A.E., A, x, 254]. 



Drs. Bomer, Blunck and Dyckerhoff have studied at Naumburg 

 the action of a large number of insecticides on the rape beetle [Meligethes 

 aenens, F.] and on flea-beetles. The latter cannot fly well, so that when 

 the direction of the wind has been constant for some time most of the 

 individuals will be found at the lee-side of a field, where they remain 

 until lack of food compels them to move against the wind. This must 

 be taken into consideration in reckoning the value of remedial measures . 



Disappointing results were obtained with arsenicals against flea- 

 beetles. On the other hand, a solution of 0-27 per cent, carbohc acid 



