299 



second generation. After doing some damage, this second generation 

 migrates to the far south. Kunckel d'Herculais has estabhshed the 

 fact that it never oviposits in Algeria, while the locusts coming from 

 the far south oviposit several times during their journey. These form 

 the invading bands, and colonists in the Tell districts should know that 

 the destruction of eggs and young locusts in the south of Algeria will 

 not prevent invasion of the Tell districts. This incorrect idea has 

 arisen from the confusion between S. ])eregrina and Dociostaurus 

 (Staioronotus) maroccanus, which normally lives in the steppes of 

 Algeria. Radically different control methods are required in dealing 

 with these two species. 



bezouro dos cannaviaes. [The beetle of the cane-fields.]— C/mcaras 

 e Quintaes, S. Paulo, xiii, no. 4, 15th April 1916, pp. 248-249, 1 fig. 



From early times Ligyrus fossator, Burm., has caused considerable 

 losses in the sugar-cane growing States of northern Brazil. In the 

 State of Pernambuco, especially in the Ipojuca Valley, it was customary 

 when dra^\^ng up a contract for the letting of a cane-field to insert a 

 clause exempting the tenant from the payment of rent in those years 

 in which this pest appeared. The injection of carbon bisulphide and 

 the flooding of infested land are the methods advised by Dr. Moreira. 

 Against the larva the best method is the hoeing of the ground, care 

 being taken to kill all the larvae fomid. An alternative method is the 

 flooding of the ground prior to planting. Light-traps are the best 

 measures against the adult beetles. In the case of all such larvae the 

 following factor greatly aids control, providing as it does, an oppor- 

 tunity of destroying large numbers. When heavy rains inundate low- 

 lying points, the larvae there will be suffocated where the soil is 

 permeable. As the water recedes, the survivors return from adjoining 

 points of refuge and follow it because they need moisture. When the 

 bottom of the pool dries up entirely, large numbers of them will be 

 found there. Straw should be heaped and burnt on these depressions 

 which will destroy the larvae at the surface. To kill those which are 

 buried, it is only necessary to flood this small area. If flooding is not 

 possible, carbon bisulphide may be injected. By offering a small price 

 for a given weight of larvae, large quantities could be coUected. In 

 Alagoas another Scarabaeid, Ligyrus fossor, Latr., has also appeared 

 and requires the same control measures. 



Feytaud (J.). Recherches sur I'Eud^mis et la Cochylis dans le Borde- 

 lais en 1913. [Investigations on Polychrosis botrana and Clysia 

 ambiguella inth.e'Bovdela.is in 1913.] — Ann. Service des Epiphyties, 

 Paris, ii (1913), 1915, pp. 109-152, 6 figs., 2 charts. [Received 

 nth May 1916.] 



Whilst Clysia ambiguella caused little damage in the Bordeaux 

 districts in 1913 owing to its set-back in 1911, Polychrosis botrana was 

 responsible for losses estimated at about £1,600,000, in spite of the 

 fact that the injury was very irregular in character from various 

 causes. The developmental cycles of C. ambiguella and P. botrana in 

 1913 are dealt with in detail. 



The second section of this paper deals with insecticides. Laboratory 

 experiments on the action of milk of Hme and on the comparative value 



(C275) d2 



