208 CHIRON OMID^E. 



b b b. Ungues without bristly hairs or onychia. One of the 

 ungues (in the female only ?) longer than the other. First 

 tarsal joint longer than the second. Subcubital vein united 

 to the cubital between the middle of the costa and the tip 

 of the wing. Species 46. 



a a. Wings quite bare. Subcostal vein united to the costal between 

 the middle of the fore border and the tip of the wing. 

 b. Femora unarmed. 



c. Ungues not denticulated. 



d. Ungues of both sexes of equal length. Species 47, 48. 

 d d. TJngues of equal length, with a short claw by them in 



the female. Species 49. 

 d d d. With a claw in the female longer than the others. 



Species 50-53. 

 c c. Ungues (in the female only ?) with a tooth on the inner 



side. Ungues of equal length. Species 54. 

 b b. Some, or all the femora, spinose on the under side. Palpo- 

 myia, Megerle. 

 c. Ungues without spines. 



d. Ungues of equal length in both sexes. Plants hairy. 



Species 55-58. 

 d d. One of the ungues longer than the other in the female. 



Plants hairy. Species 59. 



c c. Ungues (of the female only ?) with some spines on the inner 

 side. Ungues of equal length. 

 d. PJantaB hairy. Species 60-63. 

 d d. Plantse spinose. Spharomias, Steph. ; Curt. Species 



64, 65. 



b b b. Hind femora incrassated, spinose beneath. Ungues without 

 spines. One claw longer than the others. Serromyia, Meg. 

 Prionomyia, Steph. Species 66. 



A A. Wings with one cubital areolet, produced from the prsebrachial 

 to the costa. Wings bare. Subcostal vein united to the costal be- 

 tween the middle of the fore border and the tip of the wing. 

 a. Femora simple. 



b. Ungues without spines. Species 67-70. 

 b b. Ungues with a spine on the inner side. Species 71. 

 b b b. Ungues with a small claw beneath. Plants spinose. Sp. 72. 

 a a. Some, or all the femora, spinose on the under side. 

 b. Ungues without spines. Species 73-76. 

 b b. Ungues of the female with a spine on the inner side. Species 



77-81._ 

 A A. Antenna? with the three last joints elongated. Species 82. 



The species of Ceratopogon generally require to be well pre- 

 served and displayed, and highly magnified, in order to identify 

 them with the characters by which Winnertz has described them, 



