546 



Steiner (G.). Untersuchungen iiber den allgemeinen Bauplan des 



Nematodenkorpers. [Observations on the General Structure of 



Nematodes.^ — Zool. Jahrb., Jena, Abt. Anat. & Ontogenie, xliii, 



pt. 1, 1921, pp. 1-96, 3 plates, 55 figs. 



The object of this paper is to throw some light on the origin and 



relations of Nematodes. 



V. Lengerken (H.). Eine Mordellistena (Coleopt.) als Schadling an. 

 der Orchidee Cattleya Jabiaia forma trianaei Duchartre. [A 



Species of Mordellistena injurious to Orchids.] — Zool. Jahrb., 



Jena, Abt. Systematik Geogr. & Biol, der Tiere, xliv, pt. 6, 1922, 



pp. 579-594, "18 figs. 



Mordellistena cattleyana, Champion {beyrodti, sp. n.) [cf. R.A.E., A, 



ix, 67, 451], of which the various stages are described, is recorded as 



injuring orchids {Cattleya labiata) near Berlin. The eggs of this beetle 



are inserted into the parench^^ma of the leaf. Towards the end of 



May all stages of larvae were found as well as adults. By the end of 



June the number of adults began to diminish. As many as four to 



eight larvae of various stages were found in a single leaf. 



Znamexski (A. v.). CpoKM noceea JipoBbix m osMMbix xneSoB c 



3HT0M0J10rM4eCK0M TOHKM SpeHMfl. [Times of planting Spring 

 and ^^'inter Grain from the entomological point of view.] — 



TpYAbi nonraBCKOM C.X. OnbiiHOM CiaHi^MM, HapoAHbifi Kommc- 

 Capnai SeMJiefleJlMfl YKpaUHbl [Trans. Poltava Agric. Expt. Sta., 

 National Commissariat of Agric. of the Ukraine^, Kharkov -Poltava, 

 no. 33, 1921, pp. 165-173. [Received 1st September 1922.] 



Further observations on the attack on various grain crops by 

 Oscinella frit, L., show the advisabilit}^ of the early sowing of spring 

 crops and the late sowing of winter crops, which coincide with the 

 normal time of sowing for the Poltava district. In these circum- 

 stances the attack is generally limited to the side-shoots and proves 

 to be beneficial rather than injurious to the yield [R.A.E., A, iii, 231]. 



Lebedev (F. n.). k BbiflCHeHMH) Bonpoca o agmctbhh MMHepanbHbix m 

 pacTMienbHbix Aaob Ha AsMaTCKyro CapaHHy. [On the Question of 

 the Action of Mineral and Vegetable Poisons on the Asiatic 

 Locust.]— iC^^y, 1919, 30 pp. [Received September 1922.] 



From experiments with sodium arsenite, it is evident that the 

 strength of the solution of this poison is not of any great importance 

 in dealing with locusts. Good results were obtained with a solution of 

 \ per cent., which is equal to about one pound of poison to 2f acres. 

 Details are given of the results obtained with various strengths of 

 solution and the mortality caused, also of the amount of food eaten. 

 Apparently very little of the poisoned food is eaten, and feeding 

 practically stops after ingestion of the poison. Feeding also ceases 

 just before and after moulting and on rainy, cold and windy days. 

 The efQcacy of the poison depends on the method of application, which 

 is of course useless at times when feeding does not occur. It is essential 

 that the solution be evenly mixed and applied in the form of a fine 

 mist. Should the spray be too dense the drops will coalesce and roll 

 to the ground. These experiments were also confirmed in field tests. 

 Experiments with vegetable poisons were not continued as they proved 

 useless. 



