CHIRONOMIDJE. 25 



6. Anal angle of the wings obsolete. . . CORTNONEURA Winnertz. 

 Anal angle prominent 6 



6. Wings bare. ........... 7 



Wings hairy. 10 



7. Front metatarsi as long or longer than the tibiae. CHIRONOMUS Meigen. 

 Front metatarsi distinctly shorter than their tibiae. ... 8 



8. Legs black and white annulate. . . CRICOTOPUS V. d. Wulp. 

 Legs unicolorous or with portions darker. . . . . .9 



9. Posterior branch of the posterior furcation sinuous. 



CAMPTOCLADIUS V. d. Wulp. 

 Posterior branch of the posterior furcation straight. 



ORTHOCLADIUS V. d. Wulp. 



10. Front metatarsi longer than their tibiae. TANYTARSUS V. d. Wulp. 

 Front metatarsi shorter than their tibiae. . . , . .11 



11. Thorax produced conic-ally in front over the head; hind tibiae dilated 



and hairy EURYCNEMUS V. d. Wulp. 



Thorax moderately produced ; hind tibiae not dilated. 



METRIOCNEMUS V. d. Wulp. 



12. Antennae with an unequal number of joints in the two sexes (14, $1); 



penultimate joint of the front tarsi usually short and broad. 



DIAMESA Meigen. 



Antennae with an equal number of joints in the two sexes (15); the 

 penultimate joint of the front tarsi longer than the ultimate joint. 



TANYPUS Meigen. 



13. Proboscis and palpi rudimentary ; abdomen shorter than the thorax. 



CLUNIO Haliday. 

 Proboscis and palpi as usual; abdomen at least as long as the thorax. 14 



14. Palpi three-jointed. . . . . . TERSESTHES Townsend. 

 Palpi four-jointed. , . . . . . . .'-'. 15 



15. Antennae with the same number of joints in both sexes. . . 16 

 Antennae with an unequal number of joints in $ and 9; l p g 8 mod- 

 erately long, the front tarsi the longest ; thorax produced over the 

 head ; wings shorter than the abdomen. . HYUROB^NBS Fries. 



1(5. Antennas with seven joints in $ and 9- CHASMATONOTUS Loew. 

 Antennas with fifteen joints in $ and 9 1" 



17. Wings hyaline. . . . . . . . MACROPEZA Meigen. 

 Wings spotted (West Indies). . . . . . (ECACTA Poey. 



