chironomtdyE. 25 



5. Anal angle of the wings obsolcti'. . . CoRVNONKfRA Winnortz. 

 Anal angle prominent. ......... 6 



(3. Wings bare. ........... 7 



Wings liairy. .......... 10 



7. Front metatarsi as long or longer than the tibije. CniRoxojns Meigen. 

 Front metatarsi distinctly shorter than their tibia\ ... 8 



A- 



8. Legs black and wliite annulate. . . Cricotoims V. d. Wulp. 

 Legs unicolorous or with portions darker 



0. Posterior branch of the posterior furcation sinuous. 



Camptocladius V. d. Wulp. 

 Posterior branch of the posterior furcation straight. 



Orthocladits V. d. Wulp. 



10. Front metatarsi longer than their tibia?. Tanytarsus V. d. Wulp. 

 Front metatarsi shorter than their tibise. . . . . .11 



11. Thorax produced conically in front over the liead ; hind tibia» dilated 



and hairy Eurycnemis V. d. Wulp. 



Thorax moderately produced ; hind til)i;e not dilated. 



Metriocnemus V. d. Wulp. 



12. Antenna^ witli an unequal nund>er of joints in the two sexes (J 14, '^l); 



penultimate joint of the front tarsi usually short and broad. 



DiAMESA Meigen. 

 Antenna? with an equal num])er of joints in the two sexes (15); the 

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



Tanvpus Meigen. 



lo. Proboscis and ))alj)i rudimentary ; abdomen shorter than the thorax. 



CuiNK) Haliday. 

 Proboscis and ])alpi as usual; abdomen at least as long as the thorax. 14 



14. Palpi three-jointed. ..... Tkrsestiies Townsend. 



Palpi four-jointed. ......... 15 



15. Antenna; with the same number of joints in botli sexes. . . 1(5 

 Antenna; with an unequal number of joints in $ and 9; l^\2;s mod- 

 erately long, the front tarsi the lf)ngest ; thorax produced over the 

 head ; wings shorter than the abdomen. . IIvdhoh.kniis Fries. 



T'l. Antenuiu with seven joints in $ and 9- Ciiasmatonotus Loew. 



Antemiie witii fifteen joints in $ and 9- • • • • • 1^ 



17. Wings hyaline Macropeza Meigen. 



Wings spotted (West Indies) CKcacta Poey. 



