500 



No WELL (W.). Two Scoliid Parasites on Scarabaeid Larvae in Barbados. 



— Ann. App. Biol, London, ii, no. 1, May 1915, pp. 46-57, 

 1 fig., 1 plate. 



Two of the Lamellicorn beetles which occur m Barbados, are 

 the Dynastid, Ligyrus tumulosus, Biirm., and the Melolonthid, Phytaliis 

 smithi, Arrow. The latter is parasitised by the Scoliid wasp, Tiphia 

 parallela, Smith, and the former by another Scoliid, Campisomeris 

 {Dielis) dorsata, F. A description is given of the method by which 

 Tiphia was introduced into Mauritius where P. smithi, which had 

 probably been imported from Barbados, is now causing great damage 

 over an ever-increasing area. [See this Review Ser. A, i., p. 28.] 



Dry (F. W.). An Attempt to Measure the Local and Seasonal 

 Abundance of the Swede Midge in Parts of Yorkshire over the 

 years 1912 to 1914. — Ann. App. Biol., Lo7idon, ii, no. 1, May 1915, 

 pp. 81-108, 2 figs., 5 charts, 1 plate. 



This paper describes a census of Contarinia {Dii)Iosis) nasturtii, KiefE. 

 (the swede midge), made during the years 1912 to 1914 in the East 

 and West Hidings of Yorkshire. The hfe-history of the swede midge 

 and the distortion which it causes to the swede plant are briefly 

 described from T. H. Taylor's " Cabbage-Top in Swedes." The flies 

 are first found in the swede fields in June. The eggs are laid in strings 

 and clusters mostly near the base of the leaf-staUvS, but some on the 

 leaf -blades ; the younger leaves are almost the only ones to be attacked. 

 The eggs hatch in about four days and the maggots feed on the 

 superficial tissues. The larval stage lasts about three weeks. When 

 full grown, the maggots enter the soil and the flies emerge, in the 

 case of the summer broods, in from two to three weeks. The normal 

 number of broods for the season appears to be three, although in 

 the hot summer of 1911 there were four broods. The winter is spent 

 in the soil. The distortion to the plant caused by the maggots is 

 described, and, according to Taylor, this pest is one cause of the 

 condition in which the plant has several necks or main shoots instead 

 of a single one. Besides swedes, the following plants have been found 

 to be attacked : Bmssica naptts (turnip), B. nipa (rape), B. oleracea 

 (cabbage), B. sinapis (charlock or mid mustard), Raphanus sativus 

 (radish), R. raphanistrum (wild radish). Turnips are only attacked 

 to a very shght extent. In May-sown fields, the attack was more 

 severe than in June-sown ones and coast districts were less infested 

 than inland ones. This midge ap])ears to be very largely influenced 

 by weather. An Empid fly which preys upon the midge was 

 common at Garforth (West Biding) in June 1914 ; some individuals 

 are also accounted for by small spiders. In September 1914, a number 

 of Proctotrupid parasites were reared from the larvae. 



HoRNE (A. S.). The Occurrence of Fungi on Aleurodes vaporariorum 

 in Britain.— ^rm. App. Biol., London, ii, no. 1, May 1915, 

 pp. 109-111. 



In December 1914, a considerable quantity of fungus was noticed 

 on the leaves of Centrojwgon, at Wisley, which was badly infested, for 

 experimental purposes, with the nymphs of Aleurodes vaporarionmi 



