12 DIPTERA. 



orange-coloured above, including the scutellum ; metanotum brown, with a faint 

 reddish line in the middle ; pleurae blackish-brown, except the portion in front of the 

 root of the wings, which is reddish ; halteres and legs brownish-black. Abdomen 

 black, with a bluish metallic reflection ; genitals black. "Wings brown, darker along 

 the costa ; tip of the auxiliary vein nearly opposite the proximal end of the first sub- 

 marginal cell ; great cross-vein in one specimen opposite the middle of the discal cell, 

 in the other nearer its end ; there are four posterior cells. 

 A male and a female. 



5. Eriocera gracilis, sp. n., s . 



Rather slender, black ; frontal tubercle orange ; base of the abdominal segments 3-5 reddish ; wings pale fuligi- 

 nous ; costa darker. 

 Length 15-16 millim. 



Hab. Mexico, Orizaba (Sumichrast). 



The thorax is somewhat hoary on the sides, but faintly shining on the dorsum ; 

 abdomen more slender than in other Eriocerce, shining, with bluish reflections, the posterior 

 half of segments 1-4 somewhat opaque, the basal half of segments 3-5 yellowish-red ; 

 halteres and legs black. Wings pale fuliginous, darker along the costa ; the tip of the 

 auxiliary vein does not quite reach the first submarginal cell ; the great cross-vein 

 anterior to the middle of the discal cell ; there are four posterior cells. 



A male (coll. JBellardi). 



N.B. — It may be that the yellowish-red colour at the base of some of the abdominal 

 segments does not exist in the female ; such, at least, is the case in E. hcemorrhoa. 



6. Eriocera pretiosa, sp. n., s . 



Altogether black, mostly opaque, the abdomen more shining ; wings brownish, darker along the costa. 

 Length 12 millim. 



Hab. Mexico, Orizaba (Sumichrast). 



Head altogether black, opaque ; front bituberculate, the ordinary tubercle being 

 bisected by a deep incision in the middle. On the thorax three stripes are visible, 

 which are deeper black and more opaque than the rest of the surface ; their intervals, 

 especially backwards, are slightly clothed with a yellowish-brown pollen ; pleurae with 

 a similar, very fine, pollen ; halteres brown. Abdomen black, moderately shining, 

 with slight bluish reflections ; the posterior half of the intermediate segments each with 

 a more opaque cross-band of ill-defined outline, not touching the hinder margin. 

 Legs black. Wings brownish, darker along the costa ; stigma not darker than the 

 rest ; the tip of the auxiliary vein is nearly opposite the middle of the distance between 

 the distal ends of the two submarginal cells ; there are four posterior cells. 



A single male (coll. Bellardi). 



