ERISTALIS. 175 



14u. Eristalis cognatus, Wied. 



Eristalis coipiatus, Wiedemann, Anal. Eiit. p. 37 (I8"^y) • id 

 Auss. Zweifi. ii, p. 180 (1830). ' '' 



d" . Ihad black ; epistouie orange-yellow with yellowish shiiniuer; 

 face with broad black stripe and black clieeks ; frons witli whitish 

 shininier, black in middle immediately above antenna3 ; latter 

 brownish-black. Thorax black, grey-haired ; scutellum dusky 

 yellowish. Abdomen black ; 2nd segment with a pair of welf- 

 defined, yellow, elongate triangular spots, placed transversely, 

 rather narrowly joined to tlie yellow hind margin of the segment, 

 and extended at sides as far as Ist segment. Spots on 3rd segment 

 not very hroad, only touching anterior margin for a short distance 

 and distinctly separated from each other ; 4th segment with a 

 narrow, barely visible, yellow streak tovvartis each side at base. 

 Tip of abdomen black; venter black, 1st, 2nd and 8rd segments 

 yellow, 3i-d with a pale brown spot in middle. L'.gs blackisli- 

 brown, all knees yellowish ; basal half of fore tibiae whitish. 

 Wings barely yellowish. 



Length, 13 mm. 



Described from Tranquebar. Schiner differentiates this species 

 from his sinensis, wliicli comes from China. Both are near 

 E. tenax, L. 



Tijj^e in Copenhngen Museum. 



141. Eristalis basifemoratus, sp. nov. (PI. Ill, lig. 21.) 



$. Head: eyes with dark brown pubescence on front part only, 

 separated at base of antennae by one-third the \^idtli of the head : 

 frons slightly narrowing to vertex and face distinctly widening to 

 lower margin oF eyes ; frons black, a little yellowish-grey tomentum 

 on lower part; vertex with long blackish-biown hairs ; rest of frons 

 with bright yellow pubescence ; extreme anterior margin brown ; 

 face with yellowish-grey tomentum and bright yellow pubescence, 

 except on a rather broad, shinins; black, bare, median stripe ; lower 

 jjart of face also black. I'ace bluntly and strongly produced 

 forwards and downwards in front, but descfending onlv slightly 

 below eyes themselves in profile. Antennio blackish, arista 

 brown, plumose on basal half. Occiput blackish-grey with whitish 

 side margins and very short concolorons hairs; the usual dark 

 browniMh-yellow, long pubescence on upper margin, and longer, 

 softer, yellow pubescence o?i lower margin. Thorax dull blackish, 

 sides similar, scutellum brownish-yellow, both wholly covered with 

 dense brownish-yellow pubescence. Af>doiiH'u black; a lar'>-e 

 orange-yellow triangular spot on each side margin of 2nd segnn-nt, 

 exlending from anterior to posterior border, but well separated in 

 the middle line from each otlier; extreme hind margin of 4th 

 segment yellowish, rubesceiiee (^ap|)arently) wholly yellowish ; 

 venter dark with some pale pubescence. Legs bhuk ; about basa 



