136 EMPLOYE. 



the middle of the costa. Hind tibiae ending in a spoon-shaped 

 lobe. Species 1-4. 



a a. Third joint of the antennae small, orbicular, much more com- 

 pressed than the second. Radial vein ending about the middle of 

 the costa. Hind tibiae simple. Species 5, 6. 



1. aterrima, Hal.; Ct. 1 b. e. 397 (1832). Atra, alis sublimpidis, 

 halteribus flavis, genubus ferrugineis. Long. J; alar. 1^ lin. 



Broad, deep black. Wings nearly colourless ; veins black, nearly 

 equally distant from each other. Halteres yellow. Knees ferruginous. 

 Rare. (E.I.) 



2. nigra, Mg. zw. vi. 344. 2 (1830); Mq. Nigra, alis limpidis, 

 halteribus flavis, tibiis basi apiceque fulvis, tarsis anterioribus fuscis. 

 Long, i-f; alar. 1-1 i lin. 



Black. Wings colourless; veins black. Halteres yellow. Tibice 

 tawny at the base and at the tips ; anterior tarsi brown. 

 Generally distributed. (E. S.) 



3. exilis, Mgrle. ; Mg. zw. iii. 91. 1. pi. 23. f. 27. 28(1822) ; Mq. ; 

 Ztt. Nigra, alis limpidis, halteribus flavis, pedibm fulvis, femoribus 

 nigris, tibiis posticis nonnunquam fuscis. Long, i- f; alar. 1-1 ^ lin. 



Black. Wings colourless; veins black. Halteres yellow. Legs 

 tawny ; femora black, with tawny tips; hind tibiae sometimes brown. 

 Generally distributed. (E. S.) 



4. assimilis, Fin. d. s. emp. 8. 5 (1815). -flavipes, Mq. ; Mg. 

 exilis var., Mg. minima, Mg. ; Ztt. Nigra, alis limpidis, halteribus 

 pedibusque fulvis. Long. J ; alar. 1 lin. 



Black. Wings colourless ; veins black. Halteres and legs tawny. 

 Generally distributed. (E. S.) 



5. graminum, Em. d. s. emp. 15. 31 (1815) ; Mg. ; Hal. Nigra, 

 antennis fuscis basi flavis, alis albidis, halteribus flavis, abdominis basi 

 pedibusque fulvis. Long. ^ ; alar. |- lin. 



Body black, hardly shining. Epistoma white. Proboscis black. Palpi 

 yellow. Antennae brown ; first and second joints yellow ; third nearly 

 round, hardly longer than the second; fourth nearly four times the 

 length of all the preceding. Wings whitish ; veins brown ; second lon- 

 gitudinal vein much nearer to the third than the costa ; third and 

 fourth almost parallel ; fifth slightly curved to the hind border. Hal- 

 teres yellow. Abdomen tawny towards the base. Legs tawny; fore 

 femora thick ; fore tibiae rather thick. 



On herbage. (E. I.) 



6. lunata, Hal. MSS. graminum var. & Fin. Fusco-cinerea, an- 

 tennis basi abdomine pedibusque ferrugineis, alis fusco-ferrugineis basi 

 apice et litura costali pallidis, femoribus anticis crassissimis. Long. ; 

 alar. { lin. 



Differs chiefly in its figured wings from C. graminum. Brownish- 



