MAY I'UKS AND MIIH.'KS OF NKAV VolJK 91 



// < 'laws simple 



; Very small species; black, including its legs, wings 

 and halteres ; 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 



jj Not such flies 



/, Antenna of male with eight joints ; female like 

 Or t hoc la dins, (Australia), pl.3G, fig.26 



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

 Tck Antenna of male not eight jointed ; the female with 



seven joints 



/ 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 



(Spitsbergen) 33. Smittia 



// Wings of moderate length 



in Thorax prolonged and bent downward ; hal- 

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

 gentina ) . Synonym of Chirouomus? 



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

 in in Thorax highly arched; halteres with knob 



( Group C li i r o n o m U s) 

 it The fourth tarsal joint obcordate, shorter 



than the fifth . J 37 ' T h a 1 a s s o m y i a 



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

 HII Tarsal joint linear 

 o Wings bare 



/; Front metatarsi as long or longer than 



the tibiae 38. Chirouomus 



l>l> Front metatarsi distinctly shorter than 



their tibiae 



q Legs black and white annulate, at least 

 the fore pair . . .30. C r i c o t o p u s 

 <!<; 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 s 

 oo Wings hairy 



;; Front metatarsi longer than their tibiae 



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



