MAY FLIES ANn MIDGES OF NEW YORK 193 



ee Halteres with black tip 31^ pedestris 



cc Thorax not shining blacli 



d Legs darlv brown ; tliorax yellow with three black sti-ipes ; female 



10. brunnipes 

 (Id Legs more or less j'cllow 



e Thorax dark brown with three broad black stripes ; abdomen 

 nearly white, excepting sometimes the last three segments; 

 incisures occasionally slightly fuscous 

 / L^gs white, the middle section of each fore femur occasionally 



brownish ; male 32. nigricans u. sp. 



ff L-e^'s white a'^ical one third or one half of each fore femur Rid 

 basal one third or one half of each tibia black ; middle 

 and hind knees sometimes also darkened ; last three abdomi- 

 nal segments blackish ; male 30. p e d e 1 1 u s 



ee Thorax not so marked when the abdomen is pale 



f Abdomen fuscous, the anterior segments yellowish green 



33. a b e r r a n s n. sp. 

 ff Abdomen not marked in this manner 

 g Abdomen nearly uniform in color 



h Abdomen brown, olive green or black 



i Abdomen dark olive green; legs ferruginous; fore 

 femora dark ; crossvein not clouded ; female 



26. c h 1 o r i s 

 ii Abdomen dark green, brown or black 



;■ Thorax yellow unstriped; abdomen brown; legs yel- 

 low; length 3 to 4mmi. (St Vincent Island) 



34. 1 u g u b r i s 

 /;■ Thorax brown or yellowish with stripes 



k Legs wholly yellow ; abdomen black with yellovvish 



base ; female 25. t e n e 1 1 u s 



kk Legs partly brownish 



I Thorax dark brown with broad yellow median 

 vitta, and a pair of gray vittae on posterior 

 part ; abdomen velvet black ; anterior femora 



brownish 29. p a 1 1 i a t u s 



II Thorax with black or brown stripes 

 m Halteres pale ; female with dark greenish abdo- 

 men ; fore metatarsus nearly twice as long 



as its tibia 35. f u m i d u s n. sp. 



mm Knob of halteres with a dark tip; abdomen 



fuscous 12. c a 1 i g i n o s u s n. sp. 



hh Abdomen pale, bright green or yellow ; in dried speci- 

 mens sometimes somewhat brownish ; crossvein uncol- 

 ored 

 i Species exceeding 6^/4 nim. in length 



;■ Abdomen of female yellow ; male with darker mark- 

 ings in front of incisures ; pectus, metanotum and 

 scutellum pale ; dorsum yellow with three dark yel- 

 low stripes ; length 6.5 to 7.5 mm . . .36. t e n d e n s 



