161 



Sampson (W.). Hitherto undescribed Platypodidae and Scolytidae 

 from Portuguese East Africa. — Ann. & Mag. Nat. Hist., London, 

 ix, no. 49, January 1922, pp. 137-142, 1 fig. 



The new species described are : Crossotarsus hardenbergi, C. opifex. 

 Platypus penetralis and Cryphalus dexter. 



Sanders (G. E.). Out Arsenic Supply. — Proc. Ent. Soc. Nova Scotia, 

 1920, Truro, no. 6, March 1921 , pp. 8-1 1 . [Received 23rd January 

 1922] 



It is stated that America produces between 7,000 and 8,000 tons 

 of white arsenic and uses 16,000 tons annually, between one-half and 

 one-third of which is used for purposes other than insecticides. It is 

 probable that the demand for arsenic in insecticides will rise to over 

 10,000 tons. 



If the use of a remedy is as expensive as the loss caused by the 

 disease or insect concerned, it is useless to recommend it, and therefore 

 in order to obtain the proper benefits and to lower the cost the following 

 methods are recommended. Arsenicals that are combined with low- 

 priced bases should be used, or white arsenic or mixtures of it used 

 in place of arsenicals combined with expensive bases. Cheaper 

 methods of applying arsenicals should be adopted, and reactions that 

 render the cheaper arsenicals safe should be utilised. It should be 

 proved to owners of arsenical ores that the use of arsenic is steadily 

 increasing, and while the price may fluctuate it is not probable that 

 it wiU drop so low as to render it unprofitable to operate high grade 

 mispickle ores for arsenic alone. 



Brittain (W. H.). The Biology and Stages of Gypona odolineata. 

 Say.— Pwc. Ent. Soc. Nova Scotia, 1920, Truro, no. 6, March 

 1921, pp. 12-22, 1 plate. [Received 23rd January 1922.] 



Previous literature on the synonymy, distribution, food-plants and 

 the egg of Gypona odolineata, Say, is reviewed. A description is 

 given of all stages of this leaf-hopper. 



In Nova Scotia the egg-pouches have been observed in apple twigs, 

 chiefly in the suckers at the base of the tree shaded by long grass, 

 and in nursery stock. Experimentally the eggs hatched in two days. 

 The entire duration of the nymphal stage was 79 days. The greatest 

 activity of the larvae is in the first three instars. They are very 

 inconspicuous when at rest on the twig. No detailed account of the 

 actual nature of the injuries caused by the insect appears to have been 

 compiled. If present in considerable numbers, it may become a pest 

 of some importance, as a single specimen on an apple shoot soon 

 produces a noticeable curling of the leaves. There is only one genera- 

 tion a year, the insect hibernating in the egg-stage in the twigs. The 

 earliest date on which adults were taken was in August, and they 

 have not been found later than early October. 



Burling (V. B.). Points of Interest noted from 1920 Experiments.— 



Proc. Ent. Soc. Nova Scotia, 1920, Truro, no. 6, March 1921, 

 pp. 32-35. [Received 23rd January 1922.] 



The following facts have been obtained from the investigations of 

 1920 for the dusting of apples and potatoes. Copper arsenic dust 

 containing 4 per cent. metaUic copper is as good as the ordinary liquid 



