72 



NORTH AMERICAN DIPTERA 



Chiionomidfe.— 1. Pentapedilum, hairs omitted; 2. Tanytarsus; 3. Diamesa; 4. Crictopus 

 insolitus; o, Chironoitius ; 6, Anatopynia; 7, Trichotanypus; 8, Heptagyia ; 9, Corynoneura; 10, 

 Orthocladius; 11, Pentancura algens; 12, Procladius; 13, Metriocnemus ; 14, Piodiamesa; 15, 

 Podonomus; 16, Eretmoptera. 



