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昆蟲舉 雜！; き 第^ 卷 第查號 



SYNOPSIS OF THE ECONOMIC SYRPHIDAE 

 し OF JAPAN. (Pt. III.) 



BY PROF. S. MATSUMUKA, & 】IRO ADAC HI. F.E.S.J. 



日本 有用 食蚜蠅 科の 分類 * (第三） 

 理學 博士 松 村 松 年 大 P 本昆蟲 學會々 具 

 農學士 足 立ニ郞 大日 本昆蟲 學會々 晨 



StenosvrDhus (n.g.) 

 Near Svrphus え but difters from the latter as follows : 



Body narrow, linear. Head somewhat broader than the thorax, vertex 

 in the male distinctly elevated, much shorter than the touched portion 

 of the compound eyes, in the female the vertex somewhat broader than 

 the half breadth of the front between the antennae ； the facial tubercle in 

 the female nearly in a same level with the anteiinal-process, in the male 

 much higher and somewhat beak-like produced forwardly ; face nearly as 

 broad as the shorter diameter of the compound eyes. Antennae small, 

 nearly 《 of the facial length, not reaching to the tubercle, the 3rd joint 

 round, compressed, somewhat as long as the first and 2nd taken together* 

 The arista thick, near the base on its back, distinctly longer than the 

 antennae itself, nearly up to the tip finely pubescented. Compound eyes 

 bare, the front side in pronle distinctly arched in both sexes. Wings 

 narrow, the 3rd longitudinal vein straip-ht, opens near the apex; the cross- 

 vein at about V5 of the discoidal cell near the base, the bend of the 4th 

 vein with a long appendage. Abdomen linear, parallel on the sides, 

 narrow than the thorax, all the bands being interrupted and on the 

 lateral margin not ridged. 



We have in Saghalien only 2 following species. 



Type ― Syrphus lasiophthalmus Zett. ' 



Table of species. 



I. In the female front and vertex bluish black, face much polished. 



motodomariensis n. sp. 



一 In the female front dirty yellow, vertex fuscous, and face not 

 polished (matt) lasiophthalmus Zett. 



* 摘要 は 4 2 頁 に 在 り 



