7 o 
V. NIISIMA. 
Male : 4 mm. long. The front of the head flat, with thin yellowish 
hairs which are longer near the mouth ; and fine adculated scratches are 
similar to those in the female. The second, third and fourth abdominal 
segments thickened at the posterior margins and each with a small median 
tubercle at its middle. 
Food plant. Ulnnis campestris Sm. 
Distribution. Hokkaido : Sapporo and Mt. Moiwa (Niisima). 
Scolytus cliikisanii is nearly allied to Scolytus pruni Ratz. ; but they 
are clearly distinguishable from each other by the puncta on the elytra ; in 
Scolytus pruni RATZ, the puncta on the striae are fine and those on the 
interstices finer, while in Scolytus cliikisanii the dots on the striae are deep 
and strong, and those on the interstices very fine. This difference is also to 
be noticed in the dots on the interstices of Scolytus frontalis Blfd., its 
alternate interstices have irregular double rows of dots. 
I have collected seven females and two males in the bark of the 
firewood and dead trunks of the elm tree at Sapporo* and on Mt. Moiwa in 
May and June. The work of Scolytus cliikisanii is allied to that of Scolytus 
esuriens Blfd. in general characteristics ; but is more deeply grooved in the 
bark. The secondary galleries are arranged more closely and turned 
upward on the' wood, their extremities, crossing each other. The inner part 
of the attacked bark is thoroughly decayed and it can easily be peeled off. 
In some cases, the beetle bores deeply into the wood ; but for what purpose 
I can not ascertain. 
Scolytus eurviventralis sp. n 
(Plate II. fig. 6, 7.) 
Female : 3.7 mm. long, black, with antennae and tarsi yellowish, 
tibiae redbrown. The front of the head subconvex with aciculate scratches 
on its surface, and with a few short yellowish pubescence near the mouth. 
Vertex finely and closely punctate. Prothorax, with closely scattered fine 
dots, deeper and closer at the anterior margin, where it is not reddish. 
Elytra about ^ longer than the prothorax, little depressed around the 
scutellum ; the posterior margin, being weakly rounded separately,' and 
