196 



found a few similar deformations in Saturnia jjernyi, Guer., but not 

 in Didyoploca japotiica, Moore. This investigat on is to be continued. 



MiTANi (K.), Watarai (M.) & KoNO (D.). Kennai Yotai ni Zosho- 

 kushitaru wakaki Pediculoides-Bam Seichu no Sonogono 

 Ummei. [The Fate of Young Adults of Pediculoides -Mites after 

 Development within the Silk Cocoon.] — Dainihon Sanshikwaiho 

 [Report of the Japan Sericidtural Society], Tokyo, xxix, no. 337, 

 1st February 1920, pp. 103-107. 

 It is a known fact that when a young female Pediculoides clings 

 to the surface of the silkworm cocoon, it penetrates it and reaches 

 the pupa on which it develops. The authors have made an investiga- 

 tion as to whether the mites in this stage can again emerge from the 

 cocoon and infest other silkworms. After many experiments they 

 have come to the conclusion that they not only may attack silkworms 

 and moths near the original cocoon, but also are capable of infesting 

 the pupa in another one. They only do so however when the original 

 host-pupa has shrivelled up. The thickness of the cocoon seems to 

 afford no protection. Earlier heating of infested cocoons is therefore 

 strongly recommended against these parasites. 



MiTANi (K.), Watarai (M.) & Kono (D.). Pediculoides-T)2i,n\ no 

 Shiyu-Seichu no Wariai oyobi Yu-Seichu no tasaitcki Seishitsu 

 ni tsuite. [On the Proportion of Male and Female Individuals of 

 Adult Pediculoides Mites and the Polygamous Character of the 

 Male.] — Sangyo Shimpo [Journal of the Silk Industry], Tokyo, 

 xxviii, 1st February 1920, pp. 145-146. 



Out of 3,883 individuals of adult Pediculoides 276 were male and 

 3,607 female, the percentage of males being thus only 7 per cent. 

 Evidence of polygamy in this mite corresponding with these data was 

 actually obtained. 



Nakai (G.). Kuwa no Daiyo Shokubutsu ni kwansuru Shiken. 



[Experiments in Food-plants substituted for the Mulberry:] — 



Sangyo Shimpo [Journal of the Silk Industry], Tokyo, xxviii, 



no. 323, 1st February 1920, pp. 131-140. 



Though it is certain that the mulberry is indispensable as food for 



silkworms, Cudrania triloba, Lactuca brevirostris , Broussonetia kasinoki 



and other plants may be utilised to some extent. Silkworms can be 



fed on Cudrania triloba throughout the larval stage, though individuals 



fed only on this plant produce far inferior sillc. B. kasinoki is almost 



valueless as food for the younger instars, but at the fifth stage, especially 



toward the end of it, is as readily eaten as mulberry. L. brevirostris 



can be substituted in the first stage, especially during the first three 



davs, but for the later stages, especially the fifth, it is almost valueless, 



MiYAKE (T.). Shokuyo oyobi Yakuyo ni kwansuru Kenkyu. [Investi- 

 gations on Insects used for Food and in Medicine.] — Nojishikenjo 

 Tokubetsu-Hokoku [Special Report], Imperial Agricultural Experi- 

 ment Station, Tokyo, no. 31, 18th December 1919, 204 pp., 1 plate. 

 In this report on insects used for food and in medicine in Japan, in 



the first category only such insects are described as are dehberately 



