MAY FLIES AND MIDGES OF NEW YORK 91 



a Claws simple 



;■ Very small species ; black, iiicliuliug 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 



k Antenna of male with eight joints; female like 

 O r t h o c 1 a d i u s , ( Australia ) , pl.36, fig.26 



32. Doloplastus 

 kk 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 



// Wings of moderate length 



m Thorax prolonged and bent downward ; hal- 

 teres hanamer-llke, pl.35, figs. 26, 27, 28 (Ar- 

 gentina). Synonym of Chironomus? 

 Si. B u r m e i s t e r 1 a 

 mm Thorax highly arched; halteres with knob 



( Group G h i r on m u s ) 

 11 The fourth tarsal joint obcordate, shorter 



■ than the fifth. J^^' Thalassomyia 

 [45. Scopelodromus 



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 I^egs 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 o c 1 a d i u s 



rr This branch straight, gently arched, 



pl.30, figs. 5 to 10 



41. O r t h o c 1 a d i u 3 



00 Wings hairy 



p Front metatarsi longer than their tibiae 



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



