MAY FLIES AND MIDGES OF NEW YORK 93 



klc Media present {X y I o c r y p t a^) 



I Femora unarmed 8. C e r a t o 1 o p h ii s 



II Some of all the femora spinose beneath 



9. Palpomyia 

 m Neither fore nor hind femora thickened- 

 n Having hairy soles (plantae) 



1. Subgenus A 1 a s i o n 

 nil Having spinose soles (plantae), pi. 17, fig.16 

 2. Subgenus Sphaeromyas 

 mm 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 Heteromyia 

 <jg 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 i, 

 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. E r e t m p t e r a 

 aa Wings present 



1) 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 T any pus, 

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

 CO 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 obcordate ; wings" bare, pl.30, fig.l3 



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 



Diamesa 36. Eutanypus 



hh The M-Cu crossvein absent 



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

 male with ten, the female with six joints. .25. o r y n o n e u r a 

 cc Not as above 



d Thorax with a longitudinal fissure ; wings black with white mark- 

 ings ; antennae seven-jointed in male and female, pi. 27, fig.16, 

 and pl.31, fig.16 28. Chasmatonotus 



^This division is called Genus Palpomyia by Kieffer (1902). 

 '^Thls division is called Subgenus Palpomyia by Kieffer. 



