MAY FLIES AND MIDGES OF NEW YORK 193 



ee Halteres with black tip 31. pedestris 



cc Thorax not shining black 



d Legs dark brown ; thorax yellow with three black stripes ; female 



10. brunnipes 

 dd Legs more or less yellow 



e Thorax dark brown with three broad black stripes ; abdomen 

 nearly white, excepting sometimes the last three segments ; 

 incisures occasionally slightly fuscous 

 / Legs white, the middle section of each fore femur occasionally 



brownish ; male 32. nig r leans n. sp. 



if Legs white, apical one third or one half of each fore femnr and 

 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. pedellus 



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 4 mm. (St Vincent Island) 



34. 1 u g u b r i s 

 jj Thorax brown or yellowish with stripes 



k Legs wholly yellow; abdomen black with yellowish 



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



klc 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 



U 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 i i g i n o s u s n. sp. 



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

 mens sometimes somewhat brownish ; crossvein uncol- 

 ored 



i Species exceeding 6% mm. 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 



