MAY FLIES AND MIDGES OF NEW YORK 91 



a Claws simple 



j Very small species ; black, including its legs, wiugs 

 and lialteres ; male with fourteen nearly bare joints, 

 female with seven joints ; legs with woolly hairs ; 

 metatarsi somewhat elongated ; claws distinct, 



pl.34, figs. 6-11 31. Hydrobaenus 



/;■ Not such flies 



7c Antenna of male with eight joints ; female like 

 Orthocladius, (Australia) , pi. 36, fig.26 



32. Doloplastus 

 JcJc Antenna of male not eight jointed ; the female with 

 seven joints 

 I Wings very short, in the female scarcely reach- 

 ing the middle of the abdomen ; the abdomen 

 with a seta-like tubercle near the tip on each 

 side ; fore -tibia longer than the metatarsus 



( Spitzbergen) 33. S m i 1 1 i a 



II Wings of moderate length 



m Thorax prolonged and bent downw^ard ; hal- 

 teres hammer-like, pl.35, figs. 26, 27, 28 (Ar- 

 gentina ) . Synonym of Chironomus? 

 34. B u r m e i s t e r i a 

 mm Thorax highly arched ; halteres with knob 



( Group Chironomus) 

 n The fourth tarsal joint obcordate, shorter 



than the fifth. P^' Thalassomyia 

 [45. S c o p e 1 o d r o m u s 

 nn Tarsal joint linear 

 Wings bare 



p Front metatarsi as long or longer than 



the tibiae 38. Chironomus 



pp Front metatarsi distinctly shorter than 

 their tibiae 

 q Legs black and white annulate, at least 

 the fore pair . . .39. C r i c o t o p u s 

 qq Legs not so banded 



r Posterior branch of cubitus sinuous, 

 pl.30, figs. 1 to 4 



40. C a m p t c 1 a d i u s 

 rr This branch straight, gently arcbed, 

 pl.30, figs. 5 to 10 



41. Orthocladius 

 00 Wings hairy 



p Front metatarsi longer than their tibiae 



42. T a n y t a r s u s 



