85 



a butterfly, Virachola isocrates, on peach fruit in May ; Eariasfabia and 

 E. insulana in flower buds of Hibiscus rosa-sinensis ; and larvae of 

 Heliothis peltigera on leaves of Carthamus tinctorius. 



Zetek (J.). El Gusano danino de las Palmas in Panama. [The 

 Larva of Brassolis isthmia in Panama.] — Revista La Salle, 

 Panama, October 1919, pp. 6-8. 



This information concerning the life-history and habits of Brassolis 

 isthmia, which is the most injurious pest of coconut palms in Panama, 

 has been taken largely from a previously pubUshed paper [R.A.E., 

 A, vi, p. 19]. Of especial importance in Panama is the fact that the 

 larvae have recently been found to attack banana leaves [R.A.E., 

 A, viii, 80] and it is possible that it may prove an injurious pest of 

 plantain in that region. The formula and instructions for making 

 a suitable arsenical spray are given with directions for the kind of 

 spraying machinery suitable against this butterfly. 



Smith (R. E.), Essig (E. 0.) & Gray (G. P.). Handbook of Plant 

 Disease and Pest Control. — Univ. California, Agric. Expt. Sta., 

 Berkeley, Circ. no. 204, August 1918, 36 pp. [Received 30th 

 December 1919.] 



The insect pests, under their popular names, of varied crops are 

 briefly noted, together with the usual remedial measures. Formulae 

 and instructions for the preparation of various insecticides and poison 

 baits are appended. 



Patten (A. J.) & O'Meara (P.). The Probable Cause of Injury 

 reported from the Use of Calcium and Magnesium Arsenates.— 



Michigan Agric. Expt. Sta. Qtrly. Bull., East Lansing, ii, 

 no. 2, November 1919, pp. 83-84. 



Reports of injury to foliage from the use of calcium and magnesium 

 arsenates have been steadily increasing. Experiments here described 

 show that the large quantities of carbon dioxide liberated by the 

 leaves during the night are the probable cause of injury, owing to the 

 solubility of calcium and magnesium arsenates in carbon dioxide. 

 The addition of lime to these sprays may possibly lessen the danger of 

 injury, but further investigations are necessary to confirm this. 



Schumacher (F.). Der gegenwartige Stand unserer Kenntnis von der 

 Homopteren-Fauna der Insel Formosa. [Our present Knowledge 

 of the Homoptera of Formosa.]— Mi«. Zool. Mus., Berlin, viii, 

 no. 1, September 1915, pp. 73-134. 



This hst of Homoptera includes a Cicadid, Mogannia hebes, Wlk., 

 which is a pest of sugar-cane. 



Cercopids: Cosmoscarta uchidae, Mats., found in large numbers 

 under the leaves of wild bananas ; C. bispecularis, White, very harmful 



