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見 蟲學雜 誌 第 参^ 第奄縱 



Subg. Lasiophticus Rond. 

 RoND. Dipt. Ital. Prod. I, II. p ••• (1856). 

 Compound eyes pubescented. in the male the upper facets much larger 

 than those of the lower part. Vertex short, nearly one half of the touch- 

 ed portion of the compound eyes ； the anterior ocellus not smaller than 

 the posterior ones, and 3 ocellis being placed nearly in an equilateral 

 triangle. The 3rd longitudinal vein of the wing opens a little before 

 the apex. 



We have in Japan only the following one species 



7. Syrphus (Lasiophticus) topiorius Meig. 



Syrphus topiorius Meig Syst. Beschr. Ill p 305 (1822); Zett, 

 . Dipt. Scand. II. p. 723 (1843); Schin. Faun. Austr. Dipt. 1. 



p. 304 (1862). 



Thorax grayish green, without luster. Face yellow, with a slight 

 bluish luster, without fuscous stripe, fuscous pubescented. Front olivace- 

 ous, with a fuscous triangle above the antennae, vertex fuscous, the both 

 being fuscous pubescented. Antennae brown, the inferior part yellowish, 

 the arista yellowish brown. Compound eyes whitish fine pubescented. 

 beinp- somewhat less in the female, in the male with much larger facets 

 on the upper parts of the eyes Thorax lonp" fulvous pubescented, the 

 hairs on the sides beinp- denser and lonVer. Scutellum waxy olivaceous 

 yellow, black pubescented, on the hind margin beneath with yellowish 

 hairs. Wings hyaline, veins fuscous, stit^ma pale brown. し alypteres 

 grayish, haiteres yellow. Abdomen with 3 yellowisn bands of subequal 

 breadth, the first near the middle of the segment, widely interrupted, the 

 2nd and 3rd each near the anterior margin, at the hind margin being 

 somewhat emarginated, the all reaching to the lateral margin with their 

 narrow upturned apices ； the 4th and 5th segments each at the hind 

 margin narrowly yellow ； fuscous and yellowish pubescented. Venter 

 pale yellowish, with an interrupted broad fuscous stripe in the middle, 

 on the sides also fuscous striped. Legs yellow, coxae, trochanter, the 

 bases of femora (much more extended in the hind femur) tarsi and a 

 middle spot of the hind tibia, fuscous. 

 Length —— 1 1-14 mm. 



Hab. ― Saghalien, Hokkaido, Honshu ； Europe. 



