MAY FLIES AND MIDGES OF NEW YORK 137 



dd The fascia lies proxiinad or over the crossvein 



c The abdominal segments of the male each have brown posterior 



margins ; head brown, 3 mm 3. f u t i 1 i s 



ee 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. carnea 



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



dividing lines cinerous 4a. var. a. carnea 



Legs distinctly bicolored 



c Wings spotted but not banded 



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



(Greenland) 5. pulchripennis 



dd Pale (reddish or yellowish) species 



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



latus Say) 6. monilis 



ee Tibia not with three rings 



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

 about eleven brown spots (California and New Mexico) 



7. venusta 

 ff Femur with one ring 



g Abdomen of male pale yellow, black and brown fasciate; 

 wing with apex from slightly before tip of R 1? 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. b a r b e r i 



CG Wing with one or more cross bands 



d Femora and sometimes tibiae also with brown bands 

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

 marked with several hyaline spots; each femur with sub- 

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



10. dyari 



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



f Wings yellow, humeral crossvein brown clouded, brown fascia 



across wing and at apex of vein B lf each femur with 



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



brown ; length 3 to 3.5 mm. (New Jersey) . .11. johnsoni 



ff A pale brown cloud near the tip of the wing also ; length 3 to 



5 mm 12. ornata 



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, metanoturn, 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 



