275 



Hata (S.)- Sanji no Shiryo to shiteno Shaku to Kenshitsu tono Kankei. 



[On the Relation of the Quality of Silk to the Feeding of Silkworms 

 on Cudrania triloba]. — Sanr/yo-Shimpo [Journal of the Silk 

 Industry], Tokyo, Year xxvii, no. 313, 1st April 1919, pp. 316-320. 



It is a well known fact that silkworms fed on Cudrania triloba 

 produce a more elastic silk than those reared on mulberry leaves. 

 The Cudrania leaf contains more tannin (7 "9 per cent.) than that 

 of the mulberry (6*5 per cent.), and the author found that by the 

 addition of the requisite quantity of tannin to the mulberry leaf, 

 he was successful in obtaining increased elasticity in the silk. On 

 the other hand Cudrania contains less lime (3 '5 per cent.) than the 

 mulberry (4:'5 per cent.), and this is in opposition to the known fact 

 that mulberry foliage containing more lune produces a more elastic 

 silk. Further investigation on this point is therefore required. 



MiTSUHASHi(S.). Nihonsan Kitteichu-rui ni tsuite. [On the Japanese 



Buprestidae.] — Bipclmgai Zasshi [Journal of Plant Protection], 

 Tokyo, vl no. 4, 5th April 1919, pp. 272-277. 



The author enumerates 69 species of Buprestidae known to occur 

 in Japan, with particulars of their food-plants. Attention is called 

 to the fact that Buprestis japonensis, Saund., according to Prof. 

 Sasaki, has been recorded as injuring lead-piping. Other species of 

 economic importance are : Chrysochroa elegans, Thunb., in Quercus 

 acuta and Pinus thunbergii ; Chrysodema amabilis, Voll., in Pinus 

 thunbergii ; Chalcophora japonica, Gory, in Pinus and Quercus ; 

 Chrysobothris succedanea, Saund., in broad-leaved trees ; Dicera aino, 

 Lewis, in Abies sachalinensis ; Agrilus spinipennis in Zelkowa acumi- 

 nata and Ulmus parvifolia ; and Trachys griseofasciata, Saund., in 

 Z. acuminata. 



Miller (D.). Injurious Insects in New Zealand. — New Zealand Jl. 

 Agric, Wellington, xviii, no. 2, 20th February 1919, p. 101. 

 [Received 5th May 1919.] 



Of all the injurious insects in New Zealand only 18 per cent, are 

 indigenous, the remaining 82 per cent, originating chiefly from Europe. 

 Although the pests attacking field and vegetable crops constitute 

 the smallest group, the greatest losses occur amongst these crops. 

 This is probably due to the absence of legislation and the scarcity 

 of information regarding them. 



Ritchie (W.). The Structure, Bionomics and Forest Importance of 



Cryphahis abietis, Ratz. — Ann. App. Biol., Cambridge, v, nos. 3-4, 

 April 1919, pp. 171-199, 15 figs. 



Owing to the increasing number of records of Cryphalus abietis, 

 Ratz., in Scotland, this Scolytid beetle can no longer be counted as 

 a rare species in Britain. A description is given of all its stages. 

 The period of the life-cycle from egg to adult varies under different 

 conditions, the average being from 93 to 108 days. The eggs, which 

 take about 10 days to hatch, are laid irregularly in batches along 

 the brood gallery. The female does not necessarily complete the 

 gallery before commencing oviposition ; 5 to 7 weeks are required 



