SCELLUS. 205 



abdomen coppery-green, bright ; halteres brownish ; wings black, though 

 the root and the margin of half the costa is whitish, the whole posterior 

 margin gray; anal appendages of the male white, towards the basia on 

 the under side with a black margin, towards the tip yellow, at the ex- 

 treme tip marked with a brown spot. Long. corp. 0.15. Long. al. 0. L9. 



Syn. Hydrophorus notatus Zettekstedt, Ins. Lapp. 701, 4, in obs. 



Hydrophorus spinimanus Zettekstedt, Dipt. Scand. II, 445, 5. 



Male. Blackish bronze-colored. The face is comparatively a 

 little broader than in S. erustus, covered with bright ochre-yellow 

 dust and opaque. Antenna? black. Front with whitish dust. 

 The ground-color of the thorax is of a coppery-bronze ; upon the 

 middle of the upper side more of a blackish-bronze, but almost 

 everywhere so thickly covered with dust that the coppery lustre 

 is only very little perceptible ; the dust on the* upper side of the 

 thorax is snow-white, upon the two longitudinal stripes near the 

 lateral margin it is less thick, so that the coppery reflection of the 

 ground-color is more distinct ; upon the middle there are two nar- 

 row, dark longitudinal lines, close to each other, which do not 

 reach as far as the posterior margin of the thorax. Upon the 

 pleurae the color of the dust is more yellowish. The scutellum has 

 two bristles, is rather opaque, with a thin whitish dust. Abdo- 

 men green, mostly with a coppery lustre, which becomes much 

 more bright near the lateral margin. The anal appendages are 

 of middling length, white, near the basis on the lower margin with 

 a narrow black border, and on the upper margin usually marked 

 with a blackish spot; beyond the middle they are inflected op- 

 wards and gradually assume a yellow color; their extreme tip is 

 marked with a small brown spot and bears a small tuft of delicate 

 pale hairs, which are turned backwards ; about the middle of the 

 interior margin there is a similar pubescence ; between them, 

 towards the anal region, there is a small tuft of delicate whitish 

 hairs. Coxa? bronze-black; the four anterior with yellow and the 

 two hind ones with a rather whitish dust ; the fore coxae with very 

 short and delicate pale hairs, near and upon the tip with a few 

 black bristles. Feet black, femora and tibiae more black-green, 

 the former bright coppery. Fore femora short, towards the basis 

 very much thickened, beset on the under side with bristles of dif- 

 ferent length, on the front side with a row of stiff black bristles. 

 Middle femora long, stronger than in S. exustus and more curved, 

 on the latter half of the under side with erect black bristles. Hind 



