MAY FLIES AND MIDGES OF NEW YORK 93 



kk Media present ( X ij I o r r y p t a') 



I Femora unarmed 8. C e r a t o 1 o p li u s 



// Some of all the femora spinose beneath 



9. P a 1 p o m y i a 

 m Neither fore nor hind femora thickened- 

 n Having hairy soles (plantae) 



1. Subgenus A 1 a s 1 o n 

 nn Having spinose soles (plantae), pl.17, flg.lG 

 2. Subgenus Sphaeromyas 

 nnu Either fore or hind femora thickened 



n Hind femora thickened, spinose beneath 



3. Subgenus S e r r o m y i a 

 nn Fore femora thickened, pi. 37, fig.9 



4. Subgenus Heteromyla 

 (jfl Thorax produced over the head ; legs usually quite long ; 

 antenna of the male usually with fourteen joints ; that of 

 the female with seven joints. (Go back to ii following /, 

 29 Telmatogeton, page 90, and read through to 

 qq, M e t r i o c n e m u s) 



KEY TO GENERA OF THE NORTH AMERICAN CHIRONOMIDAE 



a Wings rudimentary (Pacific coast), pi. 35, figs. 15 to 24 



11. Eretmoptera 

 a a Wings present 



h The M-Cu crossvein present, pi. 37, fig.24 

 c Antennae with fifteen joints ; both in the male and the female the 

 apical joint oval, pi. 27. (Go back to the Group Tanypus, 

 f, p. 89, of the preceding key.) 

 CG Antennae with fourteen or fewer joints, when the apical joint is 

 oval then antenna with fewer than ten joints 

 d Antenna of the male with fourteen joints, the apical joint very 

 long and cylindrical ; antenna of the female with seven or eight 

 joints ; fourth tarsal joint obeordate ; wings bare, pl.30, fig.13 



35. D i a m e s a 



(Id Antenna of male with nine joints, short haired; antenna of female 



with eight joints. The female does not appear to differ from 



I) i a m e s a 36. E u t a n y p u s 



hb The M-Cu crossvein absent 



a Wing club-shaped, the costal cell thickened, pi. 36, fig.7 ; antenna of 

 male with ten, the female with six joints. .25. Corynoneura 

 ce Not as above 



{/ Thorax with a longitudinal fissure ; wings black with white mark- 

 ings ; antennae seven-jointed in male and female, pi. 27, fig.l6, 

 and pl.31, fig.16 28. C h a s m a t o n o t u s 



'This division is called Genus P a 1 p o m y i a by Kieffer (1902). 

 = This division is called Subgenus P a 1 p o m y i a by Kieffer. 



