368 



ten days, and the larvae weave a nest, in the shelter of which they 

 feed. Young trees are preferred for attack, such as Pinits sylvesiris 

 of 2 years or P. pinea and P. pinaster of 6 to 8 years old ; in the latter 

 case several larvae may be found in the same shoot, and the lateral 

 shoots also may be attacked. About mid- July or early August the 

 larvae descend to the ground, where they pass the winter, pupating 

 in the following spring shortly before the adults appear. Infestations 

 in Spain differ from those recorded from other countries in the number 

 of larvae found on a shoot and in the age of the trees attacked. In 

 small areas, hand collection of the nests, which are very conspicuous 

 in June and July, is recommended ; on larger areas sprays of 3 lb. 

 anhydrated sodium arsenate to 100 gals, of water with 61b. of lime 

 have been found a successful remedy. 



Mercet (R. G.). Notas sobre Afelininos (Hym. Chalc.).— ^- Soc. Esp. 

 Hist. Nat., Madrid, Spec. Vol., 1921, pp. 299-309, 4 figs. 



Included in this list of Aphelinines, described prior to the author's 

 monograph of 1912, are Aphelinus chilensis, How., a parasite of 

 Aspidiotus hederae on Hedera helix ; Mimatomus peltatus, Ckll., a 

 parasite of Aleurodes pruinosus euphorhiariim ; Prospaltella brasiliensis, 

 Hemp., and Eretmocerus paulistus, Hemp., from Aleurodes horridus. 

 Hemp., on branches of orange ; AspidiotipJiagus aleurodis, Ashm., 

 parasitic on Aleurodes sp. attacking sugar-cane ; Physciis testaceus. 

 Masi, parasitic on Lepidosaphes ulmi ; and Prospaltella {Doloresia) 

 conjugata, Masi, reared from Aleurodes hrassicae on Brassica oleracea. 



Benaiges de Aris (C). Regeneracion del Olivar. [Re-development 

 of the Olive Plantations.] — Bol. Agric. Tec. Econ., Madrid, 

 xiii, no. 148, 30th Apiil 1921, pp. 313-358, 14 figs. 



This paper is a revision of one previously noticed [R. A.E., A, v, 138]. 

 In addition to the pests dealt with in the former account, namely, 

 Saissetia oleae and Phloeotrihus scarabaeoides (oleae), particulars are 

 given of Dacus oleae and Prays oleellus, and of suitable treatments 

 for them \R.A.E., A, ix, 278], and of Phloeothrips oleae, of which there 

 are three or four generations a year in Spain. The process of 

 fumigation with hydrocyanic acid gas under tents is described, as well 

 as the usual arsenical sprays. Psylla oleae is found chiefly in very 

 sheltered localities and during dry seasons, forming a soft, cotton- 

 like substance which prevents the normal development of flowers 

 and fruit. The best time for measures against this insect is the winter, 

 after gathering the crops, and in spring when the cottony matter 

 appears. During pruning, all galls and excrescences should be removed, 

 and the trees should then be sprayed with a solution of 4 lb. soap to 

 10 gals, of water. Fumigation with hydrocyanic acid gas is also 

 recommended, as well as nicotine-soap solutions, for both this and 

 other insects. 



Maas (J. G. J. A.). Herkenning en Bestrijding van de voomaamste 

 Ziekten en Beschadigingen van Hevea brasilie)isis. [The 

 Recognition and Control of the principal Diseases of and Injuries 

 to H. brasiliensis,] — Meded. Algemeen Proefst. A.V.R.O.S., 

 Medan. Rubber Ser., no. 28, 1921, 12 pp. 



In this concise account of the principal diseases and insect pests 

 likely to occur on Hevea brasiliensis, the first chapter enumerates the 



