344 



from lichen and moss, and the infested branches cut out ; the immature 

 stages of the scale may be removed with a brush dipped in petroleum 

 or 6-10 per cent, carbolineum, or the trees sprayed. In this con- 

 nection petroleum emulsion has given good results, as has a 10 per cent, 

 solution of kainit. The latter was rubbed over the stronger branches 

 and sprayed on the weaker ones. 



MjoBERG (E.). Over den Rupsenvraat in de Droogschuren en een 

 nieuwe radicale Bestrijdings-Methode. [Caterpillar Injury in 

 the Tobacco Drying-sheds and a new, radical Method for com- 

 bating it.] — Meded. Deli Proefst., Medan, Ser. 2, no. xvii, 1921, 

 29 pp., 6 plates, 1 fig. 



Tobacco in the drying-sheds of Sumatran estates is attacked by 

 the larvae of Phytometra (Plusia), Prodenia and Heliothis, small 

 individuals of the first two causing the most injury. These larvae 

 are brought in with the leaf and continue feeding while it withers. 

 Eggs of Prodenia that are brought in also give rise to larvae, but as 

 they require fresh leaves the injury they do is unimportant. The 

 annual loss averages about £158,000 at par, but the author's experi- 

 ments show that this is preventible at a relatively small outlay. 

 The leaves are fumigated with hydrocyanic acid gas, which in no 

 way affects them, but kills all the larvae. The fumigation chamber 

 must be large enough to render it unnecessary under normal circum- 

 stances to operate more than once a day. The generator consists of a 

 receptacle for about two pints of sulphuric acid with a tube leading 

 to a four-pint receptacle (for the potassium cyanide) below it. Both 

 receptacles are inside the building, but the tube connecting them passes 

 out through the wall and back again, being fitted with a stop-cock 

 that can be worked from outside, and allows the acid to reach the 

 cyanide. From the lower receptacle another tube leads outside to a 

 barrel completely buried underground. The bottom of the barrel is 

 perforated so that any liquid can flow down into the ground. This 

 tube is also fitted with a stop-cock outside the chamber, and allows 

 the sludge to pass down to the barrel after fumigation is completed. 

 The cost of fumigation is about one per cent, of the average loss in 

 the absence of such treatment. 



DE Seabra (A. F.) . Etudes sur les Maladies et les Parasites du Caeaoyer 

 et d'autres Plantes eultiv^es a S. Thom^. xxiii. Note sur I'lmport- 

 anee agrieole du Lymidus variicolor, Berlioz. — Lisbon, Companhia 

 Agricola Ultramarina, 1920, p. 8. 



A new pest of cacao found in the plantations of San Thome is the 

 small Chrysomelid, Lymidus variicolor, Berlioz, described in 1919 

 [R.A.E., A, vii, 268]. The adults and also the larvae, which have not 

 yet been studied, feed on, and cause serious injury to, the leaves and 

 pods. 



Porter (C. E.). Sobre dos Braconidos Argentinos. — Rev. Chilena 

 Hist. Nat., Santiago de Chile, xxiv, no. 2-4, March- August 

 1920, pp. 33-34. 



The Braconids recorded in this paper are Apanteles paphi, Schr., 

 parasitic upon the larva of Tatochila autodice, and A. reedi, sp.^^^n.,. 

 on a larva of Protoparce. 



