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昆蟲 擧雜誌 第參卷 第^ 號 



extreme base black. し ompound eyes in both sexes sparselv whitish 

 pubescented. Ihorax shining, pale fulvous pubescented, on the sides 

 hairs being grayish and longer. Scutellum yellow, at the base bluish 

 black, fuscous pubescented, on the hind margin with some yellowish 

 hairs. Winps hyaline, with a yellowish tinge, veins fuscous, stigma ful- 

 vous. Calypteres whitish, halteres fuscous, the stem being pale yellowish. 

 Abdomen as broad as the abdomen in the male, much broader in the 

 female, being much narrower at the base ； black, with 3 narrow of yellow- 

 ish bands, which being widely interrupted in the middle and in the male 

 beiug spot-like. In the male all the bands reach to the lateral margin 

 but in the female not, the 4th and 5th segments each at the hind margin 

 narrowly yellow; yellowish and black pubescented. Venter yellowish, 

 each segment at the hind margin with a fuscous band, which becoming 

 broader towasds the apex, pale yellowish pubescented. Legs black, the 

 Knees, and the first 2 tibiae (except the middle spot) yellowish. 

 Length ― ビ $ 8 - lo mm. 



Hab. — Hokkaido (Sapporo) ； 2 (i ビ, i ^) specimens collected by 

 Prof. S. Matsumura. 



var. elongatus Mats, (n.) 



Abdomen and wings elongated, the former with larger spots and much 



more elongated 5th segment. 



Length 一 ^ 11 mm. 



Hab. 一 Hokkaido (Sapporo, Urakawa) ； 3 § specimens collected by 

 Prof. S. Matsumura and Mr. M. Ishida. 



Eusyrphus Mats. (n. g.) 



Near Mesosyrphus, differs from the latter in the following characters 

 cT Head much broadsr than the thorax, front and face broad, the lat- 

 ter nearly twice as broad as the shorter diameter of the compound eyes. 

 The 3rd antennal joint round, subequal to the first and 2nd taken to- 

 gether ； the arista not pubescented. Vertex much elevated, ocelli nearly- 

 situated in an equilateral trianp^le, somewhat shorter than the touched 

 portion of the compound eyes. Proboscis long, robust, nearly as long as 

 the height of the head, with a broad sucking surface. Compound eyes 



