DURHAM DIPTERA. 131 



XXIV. 



80 (29). Male organ on a long stalk, basal joint of arista very 



long, abdomen very long and thin. 



Hypophyllus, Lw. (227) 



81 (28). Proboscis longer than the head. 



228 Orthochile, Ltr. (1253. nigroccerulea, Ltr.) 



82 (25). 0.4 2 not narrowed towards its end. 



83 (84). Thorax without distinct velvety spots, lower post- 



orbital bristles and squamal fringes black. 



Gymnopternus, Lw. (229) 



84 (33). Thorax with four black velvety spots, third antennal 



joint pointed and hairy. 



251. Lamprochromus, Mik. (1355. eltgans, Mg.) 



(Note. — Male organ not prominent, appendage often thread-like in paragraphs 

 35-55). 



85 (24). Hind femora without a praeapical bristle. 



86 (87). Arista nearly terminal (III. 35). 



Chrysotus, Mg. (230) 



87 (36). Arista distinctly dorsal. 



38 (89). Wings ovate, not narrowed at the base, eyes of the 



male wide apart on the frons. 

 231. Melanostolus, Kow. (1272. melancholichus, Lw.) 



39 (38). Wings narrowed about the base, eyes of the male 



touching or nearly so on the frons, third antennal 

 joint short and round. Diaphortjs, Mg. (232) 



40 (23). Hind coxa? with more than one erect bristle outside, 



third antennal joint very long and pointed. Body 

 usually with a silver sheen. 



41 (42). First antennal joint distinctly haired above. 



Argyra, Mcq. (233) 



42 (41). First antennal joint bare above. 



234. Leucostola, Lw. (1284. vestita, W.) 



43 (16) (51). Acrostichal bristles in a single row or irregular. 



44 (47) (48). Abdomen cylindrical, neither compressed (pressed 



together at the sides — section would be like 0) nor 

 depressed (pressed together above and below — 

 section would be like o), third antennal joint long 

 and pointed, body usually with silver sheen. 

 Moderately large species, 4-6 mm. 



