190 si'rphid.t:. 



lol. Eristalis obscuritarsis, deMeiJ. (PI. IV, figs, 15-18.) 



Eridalis obscuritarsis, de Meijere, Tijd. v. Ent. li, p. 250, c? 5? , 

 pi. vii, figs. 19, 20, abdomen c? $ (1908). 



S . Head : eyes broadly contiguous, bare, except for a little 

 sparse pubescence on upper pai't ; black-spotted, upper facets only 

 a little larger than lower; frontal triangle grey-dusted, black- 

 haired, a shilling l)lack triangular space above base of antennae ; 

 vertical triangle blackisli-brown with black hair; pale hair on 

 occipital margin ; epistome dusted with greyish-white, with short 

 whitish pubescence ; central bump small, shining black ; cheeks 

 narrow, white-haired. Antenna) reddish-yellow, upper side darker ; 

 arista I'eddish-yellosv, bare. Thorax shining black, with rather 

 long vellowish hair; side margins broadly wax-yellow, in addition 

 to three narrow, similarly coloured, longitudinal stripes which fade 

 away posteriorly, not reaching hind margin. Scutellum honey- 

 yellow ; pleurae metallic black', often obscured anteriorly by the 

 grev dust. ^6cZo??iai dead-black with metallic blackish-green hind 

 margins; on anterior segments the black colour is restricted 

 through the very large yellow side spots ; 1st segment with only 

 yellow side spots : 2nd practically entirely occupied by the spots, 

 except on middle partof anterior and hind margins and on irregular, 

 median, black, moilerately broad stripe; 3rd segment with a large 

 vellowish quadrate spot on each anterior corner, these spots 

 merging gradually hindwards in the brownish or blackish hinder 

 part of the segmeut ; a broad median black stripe and a yellouish 

 curved band across middle of segment, not reaching sides ; 4th 

 se<rment black with a similar yellowish band ; hind margins of 2nd, 

 3rd and 4th segments, also all 5th segment, shining black. Legs 

 black ; extreme tips of all femora yellow, also basal half of front 

 tibiae, middle tibiae up to two-thirds, and hind tibiae at base ; tarsi 

 black ; middle metatarsi yellow to tips. Pubescence of legs, 

 including that of hind tibije, yellow. Wings clear, stigma very 

 indistinct; squamae brownish-white with concolorous fringe; 

 halteres yellow. 



Length, 10 mm. 



$ . Frons grey, whitish-dusted, rather marbled; a small shining 

 black triangular mark immediately above antennae ; all pubescence 

 of head black ; ttie shining black spot, placed in front of the 

 ocellar bump and sharply emarginate in the middle of its anterior 

 margin, reaches in this species fairly far forward ; close in front 

 of this are three small brownish marks, the lateral one on each 

 side close against the eye-margin. Thorax as in S -, median 

 stripe reaching scutellum. Abdomen dull black, the yellow spots 

 smaller than in the J, with broad, shining aeneous- or greenish- 

 black hind margins, and with a curved yellowish-white band on 

 each segment from the 2nd to the 5th, the convex side of the band 

 near the anterior margin of the segment, the band narrower in 

 the centre, not quite attaining side margins; 1st band narrow ly 

 interrupted. 



Length, 8-10 mm. 



