MAY FLIES AND MIDGES OF NEW YORK 91 



ii Olaws simple 



;■ Very small species ; black, inehuliDg 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. &-11 31. Hydrobaenus 



// Not such flies 



Jc Antenna of male with eight joints ; female like 

 O r t h o c 1 a d i u s , ( Australia ) , pl.SG, fig.26 



32. D 1 o p 1 a s t u s 

 kJc 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 downward ; hal- 

 teres hanmier-like, pi. 35, figs. 26, 27, 28 (Ar- 

 gentina ) . Synonym of Chironomus? 



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

 mvi Thorax highly arched ; halteres with knob 



( Ghroiip C h i r o n o m n s) 

 n The fourth tarsal joint obcordate, shorter 



^, ., «... , fST. Thalassomyia 

 than the htth. J 



1^45. S c p e 1 o d r 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. Oricotopus 

 (jQ 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 arched, 

 pl.30, figs. 5 to 10 



41. O r t h el a d i u s 



00 Wings hairy 



p Front metatarsi longer than their tibiae 



42. T any tarsus 



