﻿132 ÄÄ 學 雑誌 第 翏卷第 參， 四號 



11. Abdomen with 3 pairs of spots flavipenne n. sp. 



― Abdomen with 4 pairs of spots 12 



12. rhe interrupted space between the 2nd and 3rd spots 

 triangular interruptum n. sp. 



一 The interrupted space between the 2nd and 3rd spots rec- 

 tangular 13 



13. All the abdominal spots touching the lateral sides 



, Sachalinense n. sp. 



― All the abdominal spots (except the last pair) not touching 

 the lateral margin otaniense n. sp. 



1. Melanostoma inornatum Mtsa. (n. sp.) PI L， fig. 9, ？. 



^. Aeneous black, with a bluish tinge. Face grayish pruinous, 

 with grayish hairs ； front and vertex fulvous pubescent. Antennae 

 yellowish, the 3rd joint on its back and at the apex fuscous, 

 arista brownish. Thorax and scutellum pale fulvous pubescent. 

 Wings hyaline, with a light fulvous tinge, veins mostly brown, 

 those of the base and costa being vellowish, stigma fulvous. Caly- 

 pteres grayish, halte res yellow, at the base somewhat infuscated. 

 Abdomen scarcely broader than the thorax, without yellowish spots, 

 fulvous short pubescent. Venter fuscous, on the lateral sides yel- 

 lowish. Legs yellowish, coxae, except the middle ones, middle 

 part of the hind tibia, as well as the apical part of the same tarsus, 

 fuscous. 



Length —6 mm. 



Hab, — Hokkaido (sappro) ； 2 female specimens collected by 



Prof. S. Matsumura. 

 Norn. Jap. ― Mumon-tsuy ahirataabu . 



2. Melanostoma urakawense Mats. (n. sp.) PI. i, fig. 7,?. 



^. Shining black, with a bluish tinge. Face g^rayish pruinous, 

 with short grayish hairs ； front and vertex fuscous pubescent. An- 

 tennas brownish, the 3rd joint beneath yellowish. Thorax and 

 scutellum pale fulvous pubescent. Wings hyaline, with a fulvous 

 tinge, at thh basal third somewhat paler, veins brownish, stigma 

 fulvous. Calypteres grayish, halteres yellow. Abdomen nearly as 



