444 R. OSTEN SACKEN 



edge metallic blue. The yellow pubescence is hardly visible on 

 the metallic green abdomen , except at the base ; a side-view 

 shoves on the second segment two triangles beset with micro- 

 scopic fulvous pile (in the place of the ordinary yellow triangles 

 on that segment, so common in the genus Eristalis); the two 

 following segments likewise show indistinct patches of that ful- 

 vous pile. Legs black; hind femora with a metallic-green re- 

 flection ; hind tibiae with some blue reflection. Halteres yellow. 

 Tegulae whitish, with a black fringe. Wings brown, with faint 

 subyaline spots in the centre of some of the cells, especially 

 the discal and anal. 



Hab. Ramoi, N. Guinea, Febr. 1875 (Beccari) ; a single male. 



NB. Plagiocera nitens Bigot, Ann. Soc. Entom. 1880, p. 85 

 (Dorei, N. Guinea) may be closely related to this species. It cannot 

 well be the sajne, as the coloring of S. Beccarii is green and not 

 coppery, and as the characteristic fulvous pubescence is not men- 

 tioned in M.'' Bigot's description. The name Plagiocera being 

 preoccupied (Klug , Hymen. 1834) should be replaced by Pte- 

 roptila Loew. 



Heiophilus bengalensis Wied. {Eristalis) Auss. Zw. II, 167, 21 

 (Bengal) ! 



One 9, Buitenzorg, Java, {Ferrari). 



The last abdominal segment has two yellow spots at the 

 base^ not mentioned in the description. 



Wlilesia conspicienda Walk. J. Pr. Lin. Soc. IV, 118 (Celebes). 

 One 9, Kandai-i, Celebes, April 1874 {Beccari). 



Microdon spec. ? 



One 9; Ramoi, N. Guin. Febr. 1875 {Beccari). 



The specimen was probably immature and the abdomen is 

 very much shrunken. It is a form closely aUied to Microdon , 

 although tlie antennae are much shorter and the first posterior 

 cell not divided (however, there is a beginning of such a divi- 

 sion on one of the wings). I suspect that this is Walkers Pa- 



