﻿130 a 蟲學雜 誌 第 參卷第 參* 四 親 



iniuscated Abdomen black, at the base somewhat gravish prumous, 

 the 2nd segment with a small orange spot on each side, the 3rd 

 and 4th each with a broad orange band, which being deeply incised 

 at the hind margin and touching the lateral margins on its base, 

 with yellowish and black hairs. Venter nearly the same as above, 

 but more yellowish. Legs yellowish brown, coxae, basal parts of 

 the anterior and middlf legs, yellow, the posterior legs, except the 

 apices of the femora and the bases of the tibiae, mostly brownish. 



Differs from the male as follow : 

 Vertex with a bluish tinge, a space between the vertex and front 

 grayish prninous, hairs of the face being mostly whitisli. Antennae 

 more yellowish. Abdomsn dark brown, the 3rd and 4th segments 

 each with 2 orange spots at the base, the lower pair being some- 

 what smaller. 



Length — 0^ $ 10—12 mm. 



Hab. ― Saghalien (Galkinowraskoe, Shiska), Hokkaido (Sapporo, 

 Chitose), Honshu (Nikko), collected by the authors and 

 Mr. S. IssHiKi. 



Norn. Jap — Yotsuboshi-tsuyahirataabu. 



Melanostoma Schin. 



ScHiNER — Wien. Ent. Monat. IV, P. 213 (i860). 



Head hemispherical, as broad as or somewhat broader than the 

 thorax. Antennae shorter than the head, porrect, the 3rd joint 

 oval, or oblong, as long as or scarcely longer than the ist and 

 2nd taken together ； arista very fine pubescent, standing on its 

 back. Rostrum somewhat protuded, with a broad sucking surface. 

 Paipi wedge-shaped, small. Face quite broad, in the middle with 

 a small tubercle, bare, always with a black or black aeneous 

 metallic luster, often pale pruinous, but never yellowish. Compound 

 eyes bare, in the male holoptic, in the female widely dichoptic. 

 Humeral triangle not projected. 1 horax quadrate, with rounded 

 angles. Humerus and the lateral sides of the thorax never yellowish. 

 Scutellum concolorous with the thorax. Abdomen lineal, elongated, 

 rarely oblong in the female. Legs simple. Wings quite large, 



