136 EMPID^. 



the middle of the costa. Hind tibife 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 tibise simple. Species 5, 6. 



1. aterrima, Hal.; Ct. ! b. e. 397 (1833). Atra, alis sublimpidis, 

 halteribus flavis, genubus fernigineis. Long, f ; alar. \\ lin. 



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

 equally distant from each other. Halteres yellow. Eiiees ferriigbmis. 

 Rare. (E.I.) 



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

 halteribus flavis, tiblis basi apiceque fulvis, tarsis anferioribus fuscis. 

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



Black. Wings colom'less ; veins black. Halteres yellow. Tibia 

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

 Generally distributed. (E. S.) 



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

 Ztt. Nigra, abs limpidis, halteribus flavis, pedibus fulvis, femoribus 

 nigris, tibiis posticis nonnunquam fuscis. Long. \-\; alar. \-\\ lin. 



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

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

 Generally distributed. (E. S.) 



4. assimilis. Fin. d. s. emp. 8. 5 {\%lh).—JJavip)es, Mq. ; Mg. — 

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

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



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

 Generally distributed. (E. S.) 



5. graminum, rin.d.s. emp. 15.31 (1815); Mg. ; Hal. Nigra, 

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

 pedibusque fulvis. Long. \; alar, f lin. 



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

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

 round, harcUy 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 taiony ; fore 

 femora thick ; fore tibiae rather thick. 



On herbage. (E. I.) 



6. lunata, Hal. MSS. — graminum var. ^3, Fin. Fusco-cinerea, an- 

 tennis basi abdomine pedibusque ferrugineis, aUs fusco-ferrugineis basi 

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

 alar. ^ bn. 



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



