252 



Although much of the detailed information presented in this excellent 

 work does not come within the field covered by this Revieiv, chapters 

 on the interaction of endemic and introduced faunas, and the alteration 

 in the flora since European occupation, contain much data of entomo- 

 logical interest. A digest of the legislation relating to accHmatisation, 

 including a resume of the regulations guarding against the introduction 

 of insect pests, bee diseases, etc., and a bibUography of 16 pages, conclude 

 this comprehensive study of a subject of far-reaching importance. 



Mercet (R. G.). Fauna Ib^rica : Himenopteros : Fam. Encirtidos. — 



Miis. Nac. Ciencias Nat., Madrid, 25th December 1921, xi + 

 732 pp., 292 figs. [Received 11th March 1922.] 



Though the author disclaims any attempt at having produced a 

 monograph of the Encyrtids of Spain, this volume enumerates and 

 describes all those species that have, up to the present time, been 

 found in the Iberian Peninsula. In the preparation of this work 

 some 2,000 species have been collected and examined, and, as no 

 previous records were in existence, the habitat and bionomics had to be 

 studied by the author and his colleagues. Some of the present 

 identifications are probably erroneous, especially as many types 

 were not available for comparison, but it is hoped that the work may 

 serve as a basis for recognition of the species. 



A comprehensive index is given, with an appendix containing some 

 additional species captured during the time the book was in course 

 of publication. 



SiLVESTRi (F.). Stato attuale della Lotta contro la Mosca delle Olive, 



[The Present State of Work against the Olive Fly.] — Inst. Naz. 

 AgricoUura, Rome, 1922, 31 pp., 6 figs. 



The various methods of artificial control of Daciis oleae [R.A.E., 

 A, ix, 586] are fully described. The measures employed in Greece 

 [R.A.E., A, X, 3], with the spray applied onlj^ to a part of the tree, 

 have given good results, and if success attends the proposed campaign 

 in Corfu [R.A.E., A, x, 128], it will mean a great advance in the 

 artificial method. If, however, the spray also destroys useful insects, 

 its application must be limited to those years in which the olive fly is 

 abundant and the olive crop is a large one. 



Natural control should be based on the author's conviction that D. 

 oleae is not indigenous in Italy. The work that has been done in 

 this connection is reviewed, and biological notes are given on the 

 following parasites : Opius africanus, Sz., var. orientalis, Silv., 0. 

 dacicida, Silv., Br aeon celer, Sz., Allomphale cavasolae, Silv., and 

 Halticoptera daci, Silv. Up to now the attempts to establish exotic 

 parasites of D. oleae in Italy do not appear to have been successful, 

 but the parasites were imported in small numbers and at unfavourable 

 seasons. In 1920 the Itahan Ministry of Agriculture appropriated 

 funds for an investigation in north-western India, which is perhaps 

 the original home of Oka enropaea, but the unfavourable exchange 

 caused the plan to be abandoned temporarily. Sufficient funds for 

 combating the olive fly, and studying other problems connected with 

 the olive, might be obtained by contributions levied on oHve growers. 



