475 



RidiascJiina congregatella ; AUapanteles cecidiptae, gen. et sp. n., 

 parasitic upon Cecidipta excaecariae, Berg. ; Microgaster duvanae, 

 parasitic upon a Tineid in the parenchyma of leaves of Schinus longi- 

 folia ; Telenom us schroHkyi and T. edessae. parasitic upon eggs of 

 Edessa rufomarginata, Germ. ; Dissolcus paraguayensis, a parasite of 

 E. rufomarginata ; Eurytoma ridiaschinae-. parasitic on Uidiaschind 

 congregatella ; Psilornirinus Jlavidulus, gen. et sp. n., a parasite of 

 Aulacaspis {Diasjns) pentagona ; and Aphelinus argentinus, parasitic 

 on Parlatoria pergaJidei. 



Lahille (F.). La Langosta en la Republica Argentina. [The 

 Locust in the Argentine Eepubhc] — Minisf. Agric. Lab. Zool., 

 Buenos Aires, 1920. 172 pp., 1 map, 11 plates, 16 figs. 



The various forms of the locusts occurring in Argentina and their 

 synonymy are discussed. They include Schistocerca flavofasciata 

 de G., S. paranensis, Burm., S. rustica, F. (pallens, Scud.) and 

 S. cancellata, Serv. The biology of these forms is very httle known, 

 and the necessity of studying them is urged. The stages and life- 

 history of S. paranensis in Argentina are described, and particulars of 

 its external morphology are given. 



Plans are drawn up outlining the campaigns that should be 

 followed in attempting to control this locust, and a detailed account 

 is given of the campaign in Villa Nueva in 1918. In that year, 

 locust control was much facihtated by natural conditions ; the 

 insects appeared late, there was a prolonged drought, and the fly, 

 Sarcophaga acridiorum, Wey., destroyed large numbers of them. 

 They were also unusualh' heavily infested with a mite, Podapolipus 

 berlesei, Lah. 



The artificial control measures used during the campaign in Cordoba 

 were hmited almost exclusively to physical methods, and evidence 

 points to the barrier method, when properly managed, as being the 

 simplest and most efficacious against the larval and nymphal stages. 

 The various methods of collection and disposal of the locusts after 

 they are caught by the barriers are discussed. The plan for studying 

 the various data necessary for a campaign is outhned and includes the 

 locahties and dates of the first hatchings, the area of distribution of 

 the eggs, first appearances of the early stages, the numbers of eggs 

 and immature locusts destroyed, natural enemies observed, chmatic 

 conditions, etc. 



A study has been made of the general direction of the main swarms 

 coming from the north, and a chart illustrates these lines of flight. 

 If it is true, as is generally beheved, that the locust passes the winter 

 in a warmer climate further north than that of the most destructive 

 invasions, and if this hibernation occurs in the south-west of Bohvia, 

 there must of necessity be a return migration towards the north. 

 Apparently, such a migration has never been observed ; it seems 

 probable therefore that the insects develop nocturnal habits and fly 

 towards Bohvia on calm nights. As they can easily rise to a height 

 of 3,000 ft. or more, it is obvious that they may readily pass 

 unperceived. 



The author, however, is inclined to agree with the view that 

 S. paranensis has no natural and permanent breeding-ground and no 



