Diptera from the Falkland Islands. 499 



without a triangular metallic spot on each side. — Dorsum of 

 thorax metallic bronze-black, scutellum sometimes more bluish ; 

 dorsum of abdomen {except terminal segment and <$ hypo- 

 pygium, which are metallic) dull black, entirely devoid of 

 yellow or ochraceous * markings, but in <J with two pairs, in 

 ? with three pairs of greyish, greyish-metallic, or plumbeous 

 lateral spots. 



Fto. 1. 



Profile of head of <$ (enlarged). 



Head', profile of face and sliape of antennae as shown in 

 fig. 1 ; head metallic bronze, with a greenish or bluish tinge 

 on front; face (except tubercle and portion of margin of 

 buccal cavity immediately below it, which are black) and 

 occipital region greyish pollinose, the greyish pollinose area 

 on face far less coarsely and conspicuously punctate than is 

 the case in M. stegnum, Say ; frontal and vertical triangles 

 in <$ clothed with black or dark brown hair, sides of face 

 clothed with brownish hair in <$ and with whitish hair in 

 $ , jowls and basioccipital region in both sexes clothed with 

 whitish hair, front in ? clothed partly with brownish partly 

 with yellowish hair, posterior orbits clothed with pale hair 

 which becomes more yellowish above, upper portion of poste- 

 rior orbits in £ also with some dark brown hairs ; first and 

 second joints of antennae clove-brown, third joint dark sepia- 

 coloured, more or less orange-rufous or ferruginous on inner 

 side at base below. Thorax clothed with pale yellowish or 

 whitish hair, dorsal surface of scutellum in <$ clothed with 

 dark brown or brownish hair, dorsum of main portion of 



* For names and illustrations of colours, see llidgway, ' A Nomen- 

 clature of Colors for Naturalists ' (Boston : Little, Brown, and Company, 

 1886). 



