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學雜誌 第5^卷第麦號 



Table of Species. 



1 . The first 3 abdominal bands in the middle interrupted 



citrofasciatum Dec. 



― The first abdominal band only in the middle interrupted 2 



2. Wings infuscated, abdomen on the sides with black hairs ... 



fumipennis n. sp. 



― Wings not infuscated, abdomen on the sides with yellowish 

 hairs. sapporense n. sp. 



1. Xanthogramma citrofasciatum Deg. 

 Degeer : Ins, VII. 118. 9 (1776). 



Fabricius : Syst. ent. 769 and Ent. Syst. IV, 300, 82. (Syrphus 



festivus). 

 Meigen : Syst. Beschr. III. 297. 36. 



Black, thorax brassy brown, face sulphureous, front ochraceous, with 

 yellow and black hairs. The female with a very narrow, middle black 

 stripe on the front; at the vertex with black hairs ； antennae reddish 

 yellow, the first and second joints very short, with short black hairs, the 

 third rounded, the aristra brown, at the base being yellow. Thorax 

 with an ochraceous and two sulphureous markings, hairs yellow ； 

 scutellum ochraceous, at the posterior margin yellow, at the base fuscous, 

 hairs long and yellow. Abdomen black, the second to fifth segments 

 each with a yellowish band, which being interrupted in the middle, band 

 of the second interrupted widely in the middle, so that each piece of the 

 band becoming an oblong spot on each side ； venter yellow in the 

 middle, with three black chestnut-shaped markings, and another spot 

 again respectively on each side of this spot- Legs fulvous, four anterior 

 tibiae and tarsi, as well as a spot of each hind tibiae, pale yellowish. 

 Wings hyaline, with a shade of fulvous, stigma ochraceous. Halteres 

 brown. 



Length 一 of I i-i5 mm.; exp. 23-25 mm. 

 Hab. ― Hokkaido, Honshu, Europe and Siberia 

 Jap. name 一 Kiberi-hirataabu . 



