﻿150 



學雜鼸 第 卷 第四统 



Venter pale yellow, the 2nd, 3rd and 4th segments each with a chestnut- 

 like fuscous spot, the 5 th fuscous. Legs fuscous, the apices of the femora, 

 the tibiae as tarsi largely yellow, the hind legs larp-ely fuscous, only at 

 the extreme apex of the femur and both ends of the tibia yellowish. 

 Length 一 g mm. 



Hab. ― Saghalien (Motodomari); only 2 (cj^ め specimens collected 

 by the authors. 



Differs from the allied species M. COrollae F., by the black hairs of 

 the scutellum. 



4. Metasyrphus arcuatus Fall. 

 Syrphus arcuatus Fall. Dipt, suect. 42. 11 (1816)； - Me ig. Syst. 

 Beschr. III, 302, 42； Zett. Ins.lapp. 598, 2; Schin. - Faun. Austr. 

 Dipl. Vol. I. p. 305 (1862); Mats. ― Cat. Benef. Ins. Jap. p. 49 

 (1908). 



^ Bluish black. Face pale yellow, wi£h bluish luter, facial tubercle 

 and the upper part of the oral margin brownish, cheeks dirty yellow; 

 pale yellowish, but on the front black pubescented. Antennae fuscous, 

 beneath yellowish, the arista brownish. Vertex black, fuscous pubes- 

 cented. Thorax pale yellowish pubescented, on the sides and a lateral 

 tubercle before the scutellum dirty yellow. Scutellum waxy dirty 

 yellow, black pubescented, hairs on the sides and hind margin pale 

 yellowish. Wings hyaline, veins fuscous, stigma dirty yellow. Calypteres 

 yellowish white, the margin and halteres yellow. Abdomen distinctly 

 broader than the thorax, black, with 3 pairs of lunules, the first spot 

 small, oblong, situated somewhat obliquely, being pointed at the inner 

 margin, and situated far before the lateral margin, the 2nd and 3rd spots 

 each on the anterior margin indistinctly concave, on the inner sides 

 somewhat clavate and quite widely separated each other, and situated 

 nearer to the anterior margin of the respective segments, not reaching 

 to the lateral margin, the 4th and 5th segments each on the hind margin 

 narrowly yellowish ； yellowish and black pubescented. Venter pale 

 yellowish, the 2nd, 3rd and 4th segments each with a brownish spot. 

 Legs yellow, coxae, trochanter and the bases of the femora fuscous, 

 the hind femur at the basal ^ being fuscous. 

 Length 一 ii mm. 



