260 NEW YORK STATE MUSEUM 



e The posterior branch of the radius ends far before the tip of 

 the wing; wing milk white with a short black bar at its 

 base; antennae of the male with pale hairs; length 1.5 to 



2 mm 6. bysinnus 



ee R^^ moderately long ; peduncle of the halteres pale ; wing milky 

 white ; antennae and palpi black (Greenland) . . .8. parvus 

 && Crossvein but little if any proximad of the fork of the cubitus. 

 Greenland species 



c Middle legs very pilose \ 9. v e 1 u t i n u s 



CG Middle tibiae and tarsi nearly bare 10. extremus 



Note — Compare also the auxiliary key containing Walker's species on 

 p.198 



1. Camptocladius graminicola Lundbeck 



1898 h i r o n o m u s Lundbeck. Vidensk. Meddel. p.278, 59 

 1902 Camptocladius Kertesz. Cat'l. Dipt. 1:214 



Male. Thorax yellow, subshining, with three blackish brown 

 stripes, the middle one posteriorly, the lateral ones anteriorly 

 abbreviated ; the pleura yellow, the pectus blackish brown, scutel- 

 lum yellow, metathorax brown. The abdomen yellow, with yellow 

 hairs, toward the tip sometimes a little darkened. The antennae 

 yellow or pale brown, the palpi yellow. The legs also yellow or 

 pale brown. The halteres yellow ; the wings white, the anal lobe 

 moderately produced, obtuse-angled, the veins pale, toward the 

 costal border a little darker. The vein ^^^-^ is straight, the costa 

 is produced a little beyond the tip of the wing, M is almost 

 straight, and runs into the tip of the wing, the cubitus forks 

 under the crossvein, its upper branch enters the wing margin 

 under the tip of R4-f.5; its lower branch is suddenly deflected. 

 The middle and hind legs are yellow pilose, the fore pair 

 pubescent, the anterior metatarsus a little shorter than the tibia. 



Female. Similar to the male, but shorter, and also paler in 

 color; the antennae shorter than the thorax, the abdomen pale 

 yellow, the posterior margins of the segments darker, the wings 

 wider, and finally, the tip of the wing very thinly haired. Green- 

 land. Lundbeck, loc. cit. 



The male has a few very indistinct hairs upon its wing near the 

 apex ; the hairs upon the wing of the female are rather more con- 

 spicuous. Lundbeck, loc. cit. 



From this statement it appears that this species might with 



propriety have been classed with Metriocnemus. 



2. Camptocladius sp. 



(P1.30, fig.l) 



Female. A single specimen froim Lake Forest 111. resembles the 



next species, O. f u m o s u s , but differs in being paler or more 



yellowish, and in having the small crossvein at about one third 



the wing length from the base. Length 1.5 mm. 



