lOS 



In New Guinea, where the wea\'er ants are indigenous, there is 

 no reason to oppose their removal to places where they are needed 

 against ProuuxotJieca, but proposals to establish them in the more 

 distant South Sea Islands, and other regions where they do not occur 

 should not be entertained, on account of their habit of tending Aphids 

 and Coccids. 



Other leaf-sewing ants that have been observed in Cochin China 

 are Polyrhachis thrinax, Rog., var. javana, Mayr, and Dolichoderiis 

 taprohanae, Sur., var. friederichsi, Forel. 



According to Forel, Oecophylla smaragdina vircscens occurs in 

 Australia and New Guinea : and many forms of this ant are known 

 in Africa. 



Friederichs (K). Bericht iiber den staatlichen Pflanzenschutz- 

 dienst in Deutsch-Samoa, 1912-1914. [Report on the Govern- 

 ment Plant Protection Service in German Samoa in 1912-1914.] 

 — Beiheft ziim Tropent>flanzer, Berlin, xviii, no. 5, August 1918, 

 pp. 257-294. [Received 6th January 1921.] 



The contents of this report are indicated by its title. 



MoRSTATT (H.). Die Herzfaule der Kokospalmen, eine pflanzen- 

 pathologische Studie. [The Bud Rot of Coconut Palms : A 

 Studv in Plant Pathologv." — Beiheft ziim Tropenpflanzer, Berlin, 



XX, no. 3, Ma3'-Jime 1920, pp. 71-124. 



• 



Typical coconut bud-rot is due to the attack of healthy uninjured 

 palms by a bacillus that is favoured by soil conditions and injury 

 due to insects, and is probably spread by the latter. 



Secondary bud- rot depends entirely on a previous disease or injury, 

 without which it cannot occur. The relation between it and fungus 

 infestation is not yet sufficiently clear, but definite information exists 

 on the point of insect injury. The latter is chiefly due to the rhinoceros 

 beetle [Orydes rhinoceros], which sometimes enables the palm weevil 

 [Rhynchophorus] to enter, but more often prepares the way for bud- 

 rot. In East Africa there is a primary, independent bud-rot, and a 

 secondar}^ form due to Orycfes ; in Samoa the secondary form due to 

 Orycfes is the only one found ; in Ceylon primary bud-rot and in- 

 festation bv Orydes are found, but secondarv bud-rot does not occur. 



BuRKHARDT (F.). Erfahfungen mit dem Chlorpikrin als Mittel zur 

 Bekampfung tierischer Schadlinge. Experiences with Chloro- 

 picrin as a Means for combating Animal Pests.] — Deiitsdie landw. 

 Presse, xlvii, 1920, p. 417. (Abstract in Centralbl. Bakt.. Parasit. 

 u. Infektionskr., Jena, Ilte Abt., hi, no. 16-17, 20th December 

 1920, pp. 387-388.) 



Chloropicrin is a useful insecticide against Calandra granaria, moths, 

 and flies, in cases where only a small quantity of material has to be 

 disinfected, or the receptacles can be hermetically sealed. Under 

 these conditions a strength of 4 grams per cu. metre rapidh^ kills the 

 weevils. 



