﻿14S 



見蟲 f& 雑 諸 第 卷 第四敏 



3. Abdomen distinctly broader than the thorax. . .karafutonis n.sp. 



一 Abdomen as broad as the thorax or a little broader than the thorax. 4 



4. Cheeks yellowish brown, thorax in the female much narrower 

 than the abdomen arcuatus Fall. 



一 Cheeks and oral margin bluish black ； the 2nd abdominal spots 

 posteriorly black pubescented Kawaguchii n. sp. 



― Cheeks grayish black, the oral margin 'on the upper part fuscous ； 

 the 2nd abdominal spots posteriorly not black pubescented ... 

 stenopus n. sp. 



1. Metasyrphus karafutonis Mats, (n.sp.) 



Aeneous black. Face pale yellowish, with short grayish hairs ； vertex 

 aeneous - black, posteriorly with a bluish shade, fuscous pubescented; 

 front pale olivaceous ； face with a brownish stripe. Cheeks aeneous, 

 white pruinose. Antennae yellowish, on its back fuscous, the arista 

 yellowish. Mesonotum pale yellowish pubescented ； scutellum yellowish, 

 semiopaqiie, brownish pubescented, on the margins with yellowish hairs, 

 Wings hyaline, veins fuscous, stigma fulvous. Kälteres yellow ； calyp- 

 teres pale yellowish. Abdomen' oblong, with 3 pairs of yellowish lunules. 

 of which the first pair reaches to the lateral margin with its uptured 

 apex, the 2nd and 3rd pairs somewhat comma-shaped, clavate at their 

 inner margins, and uptured on both ends, not reaching- to the lateral 

 margins, the 4th at the hind margin and the 5J:h entirely yellow, the 

 latter in the middle with a short black band. Venter yellow, the 2nd - 

 5th segment each with a short fuscous band in the middle. Legs yellow, 

 coxae, trochanter and the basal halves of the femora fuscous, tarsi at the 

 apices and the hind tarsi externally brownish. 

 Length ― $ I2 mm. 



Hab. 一 Saghalien (Motodomari, Ohtani) ； 2 ^) specimen col- 

 lected by the authors. 



2. Metasyrphus frequens Mats, (n.sp.) (pi. vi， fig. 8， な.） 



ピ § Aeneous black. Face pale yellow, with a fuscous stripe, pale 

 yellowish pubescented ； cheeks grayish black. Antennae fuscous, the 

 lower surface paler ； the arista pele brown, at the apex fuscous. In the 



