170 



processionea], it is necessary to treat the terminal branches and young 

 twigs that frequently harbour the nests of the larvae. A hole is made 

 in the top of the nest into which is poured a few drops of petrol. For 

 nests that are out of reach a special instrument, such as the Pillot 

 apparatus, is required. The best treatment for nests on the lateral 

 branches is to cut oJS the ends of these and burn them immediately. 

 The operator should wear gloves when handhng the nests. 



McCoLLOCH (J. W.) & YuASA (H.). Notes on the Migration of the 

 Hessian Fly Larvae. — Reprint from Jl. of Animal Behaviour, vii, 

 no. 6, September-October 1917, pp. 307-323. [Received 22nd 

 February 1918.] 



In the course of investigations into the migration of young larvae 

 of the Hessian fly {Mayetiola destructor, Say) from the spot where the 

 egg is deposited to the base of the leaf-sheath, it was found that the 

 larvae upon hatching always turn from the anterior end towards 

 the posterior end of the eggs. The advantage of this is obvious, for 

 the eggs are normally laid with their anterior end pointing away from 

 the base of the leaf, and since the larvae emerge from that end of the 

 egg, they must turn round before they can reach the leaf-sheath upon 

 which they feed. The larvae are capable of locomotion on either an 

 ascending or descending inchne at any angle up to 90°. "When the 

 eggs are laid with their anterior ends towards the base of the leaf, as 

 is sometimes the case, the larvae upon hatching crawl up the leaf 

 until they reach the tip and then turn and move downwards. Many 

 of them die while ascending the leaf, but apparently never try to change 

 the direction of progress. The mortahty during migration of the larvae 

 hatching from eggs laid normally was 23 per cent., while among those 

 hatching from eggs laid in an inverted position it was 57 per cent. 

 Tables are given comparing the rates of migration of the larvae under 

 various conditions. 



Theobald (F. V.). Notes on New and Little Known British Aphides. 

 IV. — Entomologist, London, h, no. 657, February 1918, pp. 25-29. 



The Aphids dealt with in this paper include Truncajpids newsteadi, 

 sp.n., foimd on Hypnum spp., being the only species so far recorded 

 as feeding on moss ; Sipha paradoxa, sp. n., on Poa trivialis, the other 

 European members of the genus being S. maydis, Pass., on Holcus sp. 

 and other Graminaceae ; S. glyceriae, Kalt., on Glyceria fluita^is 

 and other grasses and sedges ; S. schoutedeni, Del Guer., on Holcus and 

 Poa ; S. berlesei, Del Guer., on Aira caryophyllea ; S. elegans, Del Guer. 

 on Hordeum murinum ; S. graminis, Kalt. , on Anthoxanthum odoratum ; 

 and S. hignoniae, Macch., on Bignonia catalpa. Callipterus ononidis, 

 Kalt., of which C. trifoUi, Mon., and Chaitophorus maculatus, Buckt., 

 are synonyms, was found in Britain in 1917 for the first time, feeding 

 upon clover. Cryptosiphum artemisiae, Pass., of which Aphis gallarmn, 

 Kalt., is a synonym, was found on Artemisia vulgare, and Tychea 

 phaseoli, Pass., a subterranean species, on potatoes, turnips and 

 roots of bean plants. This Aphid is accompanied by the ant, Myrtnica 

 ruginodis. In the case of potatoes, if it attacks the tubers soon after 

 they have sprouted, it appears to stunt the growth. 



