On some Japanese Species of the Scolytini. 
BY 
Y. NiiSima, Ringakus/ii. 
Professor of Forestry. 
(Plate II.) 
Over one hundred species of the Japanese Scolytidae have already been 
recorded by F. Chapuis, 15 W. ElCHHOF 1 2) and W. F. H. BlanDFORD. 3) 
Of those species, six were known as belonging to the genus Scoiytus of the 
group Scolytini; but their host-trees and economical relations have not yet 
been made clear, except that Scoiytus japonicus ClIAP. 4) attacks plum trees. 
The species herein described were collected in Hokkaido, chiefly in the 
vicinity of Sapporo, except one which was sent from Gifu by Mr. Y. Nawa. 
Among the six previously known Scoiytus , the four species, viz. Scoiytus 
esuriens BLFD., Sc. agnatus Blfd., Sc. aratus BLFD. and Sc. japonicus 
Chap., were recorded as collected in Hokkaido, all from the Junsai-numa 
region near Hakodate ; but I was able to collect only three of them, and 
Scoiytus agnatus BLFD. has escaped my notice. I have carefully collected 
and noted the host-trees and the works of the insects and found that the 
trees chiefly attacked in Hokkaido are the common elm, Ulmus cainpestris 
Sm. ; and out of the six which I describe in this paper, the five species were 
collected on elm trees. It seems to me not improbable that there are yet 
more species to be found in Hokkaido besides those already known and my 
three new species, for I have frequently seen the apparently undescribed 
works of a Scoiytus in the bark of the birch, Betula alba L. var. vulgaris 
DC., and moreover I have many specimens, which I think, could be group- 
ed into two or three new species ; one of them is one which W. F. H. 
1) Bruxelles, Ann. Soc. ent. Belgique. 1873, pp. 197 -199. 
2) Ibid., 1873, PP- 200-203; also D - ent - Zs - Berlin. 1877, pp. 117-126. 
3) London, Trans. Ent. Soc. 1893, pp. 422-423; Ibid., 1894, pp. 77-80. 
4) Bruxelles, Ann. Soc. ent. Belgique. 1873, p. 199. 
