KRTSTALIS. 93 



94. Eristalis tenax. Linne (1758). 



This almost cosmopolitan species is recognisable at once by the 

 two bands of brown hairs on the eyes. 



It seems to be not common in South Africa, perhaps because it 

 has only recently been introduced. Two female specimens only 

 from Stellenbosch, Cape Colony, xi. 1904 (G. A. K. Marshall). 



95. Eristalis dasyops, Wiedemann (1819). 



In general aspect very like the preceding, but differing in the 

 unicolorous hairs of the eyes and the yellow hind femora, which 

 are black towards the apex. 



This species is perhaps a Protylocera with pubescent eyes, the 

 shape of the head and the pale rounded spots on the eyes being 

 the same as in that genus ; besides the wings are pubescent, the 

 marginal cell is short-stalked, and the kink in the third vein is 

 angular and provided with the rudiment of an appendix (v. the 

 notes in my paper on Fea's Syrphids, p. 432). The present species 

 is probably congeneric with the following, but not with the 

 preceding. 



A female specimen from Obuasi, Ashanti, 31. vii. 1907 (Dr. W. 

 31. Graham). 



96. Eristalis meromacriformis, sp. n. 



c? . Length of the body 14 mm. 



Very distinct from any other species on account of the apical 

 brown spots on the wings. This species shows a great resemblance 

 to the American genus Meromacnis in the pubescence and pattern 

 on the wings, in the eyes of the male, in the hind femora, and in 

 shape of the abdomen ; but the eyes are hairy and the face has a 

 well-developed tubercle. I place it for the present in Eristalis. 

 Blilesia 0iact*/aa,Macqtiart ( 1S49), stated to be from Africa, which 

 was in my catalogue placed in Jleromacrus, while in Kertesz's it is 

 left in Jllilcsia, is without any doubt the American ^Leromacnis 

 cruciatr, Wied. ; the present species, although showing a rather 

 similar pattern on the wings, is very different, owing to the want 

 of any golden-yellow marking. 



Head black, the lower portion of the face and the peristoma 

 reddish ; frontal triangle of the male very elongate, attenuated in 

 front, dark grey pollinose, and with pale hairs ; eyes dark red, 

 slightly shining towards the middle, entirely clothed with whitish 

 hairs, without any distinct pattern and also without the pale spots 

 of Protylocera ; they are approximated at a point midway between 

 the antennae and the vertex, but not in contact ; frontal triangle 

 grey pollinose, elongate, with long pale hairs directed forwards ; 

 lunula reddish; antenna? placed on a tubercle as in Protylocira, 

 the basal joints reddish, the third brownish, elongate-oval, with a 

 long and bare, dark reddish arista ; face reddish, blackish above 

 and on the sides, where it is grey tomentose and clothed with 

 sparse and short pale hairs; it is deeply excavated below the 



