MAY FLIES AND MIDGES OF NEW YORK 



193 



ee Ilalteres with black tip 31. p e d e s t r i s 



■cc Thorax not shining black 



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



10. b r u n u 1 p e 3 



dd Legs more or less yellow 



c 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. nigricans n. sp. 



ft Legs white, apical one third or one half of each fore femur 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. 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. 

 if Abdomen not marked in this manner 

 g Abdomen neai'ly 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 

 ji Thorax brown or yellowish with stripes 



A; Legs wholly yellow ; abdomen black with yellouish 



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



Ich Legs partly brownish 



I Thorax dark brown with broad yellow median 

 vitta, and a pair of gray vittae on posterior 

 part; abdomefn 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 6I/2 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 



