MAY FLIES AND MIDGES OP NEW YORK 137 



dd The fascia lies proximad or over the crossvein 



e The abdominal segments of the male each have brown posterior 



margins ; head brown, 3 mm 3. futilis 



ec The abdominal segments of the male have brownish fasciae or 

 spots near anterior margin of each; the female has a brown- 

 ish abdomen with paler posterior margins to the segments 

 /■ Three to five mm. in length ; pale yellowish ; abdominal fas- 

 ciae of the male pale brown ; dorsal stripes reddish or 



brown 4. c a r n e a 



-ft Two and one half mm. or less in length ; thorax brownish ; 



dividing lines cinerous 4a. var. a. c a r n e a 



ZjZ) Legs distinctly bicolored 



c Wings spotted but not banded 



d Species with brown or black thorax and abdomen, pl.37, fig.17 



(Greenland) 5. p u 1 c h r i p e n n i s 



dd Pale (reddish or yellowish) species 



c Tibia with three rings; femur with one at the tip (=annu- 



latus Say) 6. monilis 



ce Tibia not with three rings 



/ Femur with two brownish rings near the apex ; wing with 

 about eleven brown spots (California and New Mexico) 



7. V e n u s t a 

 /■/■ Femur with one ring 



(J Abdomen of male pale yellow, black and brown fasciate; 

 wing with apex from slightly before tip of R„ grayish 

 brown and containing several whitish hyaline drops ; 



length 5 mm. (Washington) 8. guttularis 



gg Abdomen brownish fasciate; wing with apical half with 

 many mostly isolated brown spots ; length 3 to 4 mm. 



(New Mexico) 9. barberi 



CG Wing with one or more cross bands 



d Femora and sometimes tibiae also with brown bands 



e Wing with median band and apical third of wing brownish, 

 marked with several hyaline spots ; each femur with sub- 

 apical ring, tibia with basal ring ; length 3 to 4 mm. 



10. d y a r i 



ec Apex of wing with band or spot, but no hyaline spots in it 



jf Wings yellow, humeral crossvein brown clouded, brown fascia 



across wing and at apex of vein Ri, each femur with 



apical and tibia with basal band; tarsi white, apical joint 



browm ; length 3 to 3.5 mm. (New Jersey) . .11. j o h n s o n i 



f /■ A pale brown cloud near the tip of the wing also ; length 3 to 



5 mm 12. o r n a t a 



dd Femora and tibiae not banded, or with only apices of femora and 

 either bases or apices of tibiae slightly darkened 

 e Wing with one faint brown band. Yellow species with three 

 thoracic stripes, metanotum, spots on pleura and sternum, 

 brownish black ; apices of femora and bases of tibiae brown- 

 ish ; length 3 mm. ; female (Alaska) 13. a 1 g e n s 



