474 



is shown for cucumbers, French Leans, tomatos, potatoes, Salvia and 

 Calceolaria. Nurseries with mixed crops are generally most heavily 

 infested, as the houses are never free from fohage. If only one crop is 

 grown and the houses are kept well cleared from weeds in the winter, 

 the insect will not as a rule be noticed until May, and does not become 

 a serious pest until the end of the summer. 



Fumigation \\T.th hydrocyanic acid gas is advocated as the most 

 efficacious remedial measure. Details of its application are discussed. 

 The normal dose for a house in good condition is ^ oz. sodium cyanide 

 to each 1,000 cubic feet. The treatment should be repeated in from 

 10 to 21 days time in the summer; in the spring and autumn the second 

 application should not be given before the 30th day. It is advisable 

 to fumigate the night before the weekly watering is due, and the 

 house should be as cold as it can be got before fumigation, which should 

 be begun at dusk and completed by da^\Ti. The house should be opened 

 at dawn to allow thorough evaporation of gases before the sun rises. 



Penzer (X. M.). Cotton in British West Africa. — Federation of 

 British Industries, London, 1920, 53 pp., 2 maps. Price 2s. %d. 



This paper traces the history of the cotton industry of the whole 

 of West Africa from the earhest records to 1860, and reviews the work 

 of the British Cotton'Growing Association in British West Africa since 

 its foundation in 1902. 



The insect pests recorded include : Tetranychus sp., Aphids, the 

 leaf-roUing Pyrahd Sylepta derogata and a grasshopper Catantops 

 mtlipes, all of which attack the leaves. An undetermined stem-borer 

 and the larva of an Aegeriid moth attack the stalks and the larvae of a 

 Lamelhcorn beetle the roots. 



The bolls are attacked by Diparopsis castanea, the eggs of which 

 are laid at the base of the bract or on young leaves, Earias biplaga, 

 and Pyroderces simplex. The cotton stainer Dysdercus svjjerstitiosns 

 attacks developing bolls early in the season. 



Watson (J. P.). An apparently new Haplothrips from Cuba. — 

 Florida Entom., Gainesville, iv, no. 1, July 1920, pp. 7 & 12. 



Haplothrips merrilli, sp. n., is here described from under cap scales 

 of coconuts from Cuba taken in quarantine in Florida during March 

 and April 1920, 



Brethes (J.). Descripci6n de un G6nero nuevo y una nueva Especea 

 de Tisanoptero de la Republica Argentina. [Description of a new 

 Genus and Species of Thysanoptera from the Argentine Repubhc] 

 — Anales Mus. Nac. Hist. Nat., Buenos Aires, xxvii, 1915, pp. 

 89-92, 4 figs. 



Austrothrips verae, gen. et sp. n., taken on Trametes fulchra is 

 described. 



Brethes (J.). Hymenopteres Parasites de I'Am^rique M6ridionale. 



[Hymenopterous Parasites of South America]. — Anales Mus. Nac. 

 Hist. Nat., Buenos Aires, xxvii, 1915, pp. 402-430, 19 figs. 



Among the new Hymenopterous parasites here described from 

 South America are Doryctes ridiaschinae, a parasite of the moth 



