509 



from May to August it is at least 4-8 months. In the laboratory a 

 period of three months was observed. The duration of the life-cycle 

 depends on the date of oviposition, the vitality of the larvae and the 

 character of the infested wood. Oviposition has been observed in 

 pieces of branches of Alhizzia. 



X. qiiadripes seems to do more harm in Tonkin than in any other 

 country in the Far East. 



Robin (J.) . La Culture du Cocotier dans Pile de Phu-tuc (Cochinchine). 



—Bull. Agric. Inst. Sci., Saigon, i, no. 7, July 1919, pp. 201-207. 

 [Received 29th August 1921.] 



Coconuts in the island of Phu-tuc, in the Mekong Delta, are attacked 

 by rhinoceros beetles (Oryctes), which, however, do serious harm 

 only on the fringe of the plantations and in those that are badly 

 looked after. When growing in dense masses the palms are never 

 attacked, because the flight of the beetles is impeded. 



ViNCENs (F.). Trois Microl6pidopteres ennemis des Riz frequents en 

 Cochinchine. — Bull. Agric. Inst. Sci., Saigon, ii, no. 4, April 

 1920, pp. 97-105, 2 plates. [Received 29th August 1921.] 



This paper on Schoenohius incertellus, Chilo suppressalis and 

 Cnaphalocrocis medinalis, has already been noticed from an abstract 

 in another journal [R.A.E., A, viii, 451]. 



ViNCENS (F.). La grande Psyche du Cocotier. — Bull. Agric. Inst. 

 Sci., Saigon, iii, no. 1, January 1921, pp. 26-29, 1 plate. [Re- 

 ceived 29th August 1921.] 



Coconuts in Cochin China are attacked by a large Psychid, and in 

 some cases very severe defoliation has occurred, hundreds of cocoons 

 being seen on a single frond. Caterpillars collected in January yielded 

 adults in March ; only a few adults emerged, as the caterpillars were 

 heavily parasitised. There appears to be only one generation a year. 

 It is probable that the females, which are wingless, remain in their 

 case, and that oviposition takes place there, the eggs hatching after 

 several months. The place where the eggs are deposited and the date 

 of hatching are unknown. 



An arsenical spray against the caterpillars, and the collection and 

 burning of infested fronds against the eggs and pupae are suggested. 

 As immediate burning would destroy the parasites, the fronds should 

 be stored in containers fitted with a wire gauze screen permitting them 

 to escape. At least one important natural enem}/ known in Cochin 

 China is a Tachinid fly, which was so effective in 1919 in one district 

 as to prevent pupation in the majority of cases. 



This method of promoting the increase of parasites should be useful 

 against coffee borers ( Xylotrechus) in Cochin China, as their parasites, 

 observed by Duport in Tonkin, probably occur in the former country 

 also. 



ViNCENS (F.). La Chenille rose des Capsules du Coton. — Bull. Agric. 

 Inst. Sci., Saigon, iii, no. 4, April 1921, pp. 111-115, 2 plates. 

 [Received 29th August 1921.] 



This article describes the bionomics and control of Platyedra (Pectino- 

 phora) gossypiella, which has been reported from Siam and China. 



