MAY FLIES AND MIDGES OF NEW YORK 195 



// The fore metatarsus less thau 1.4 times as long 

 as its tibia 

 nb Yellow or whitish species 



n Deep yellow species ; female with greenish 

 tinged abdomen ; male with brown abdom- 

 inal fasciae ; fore metatarsus about IVs 

 times as long as its tibia ; length 4 to 



5 mm 44. fulviventris n. sp. 



nn Species with white or very slightly green- 

 tinted abdomen ; thorax testaceous ; knees 

 blackish, fore metatarsus about 1.25 times 

 as long as its tibia ; length 4 mm. ( See 



also No. 54) 45. p a 1 1 i d u s n. sp. 



mm Green species 



n Joints of the legs each with a moderately 

 wide black apical band ; fore femora and 

 fore metatarsus of about equal length and 

 each about 1.33 longer than the tibia 



46. f r e q u e n s u. sp. 

 nn Joints of legs without distinct black apices 

 Fbre femora and tibiae of equal length ; 

 fore metatarsus about 1.33 times as long 

 as the tibia ; fore tarsi of male hairy 



47. V i r i d i s 

 00 Fore femora noticeably longer than the 

 tibiae ; fore tarsi of male bare 



48. dux n. sp. 

 gff Abdomen bicolored-, each segment with crossbands or 

 marked incisures which may be light or dark, yellowish 

 or brownish 

 h Thorax with wide black stripes 



i Species over 7 mm. in length ; tliorax green or greenish 



yellow in gi'ound color ; thoracic stripes shining ; 



legs yellowish, knees, fore tibiae, and tarsi in part, 



blackish; crossvein clouded. .. .49. viridicollis 



ii Species 5 mm. or less in length 



/ Thorax reddish with black stripes ; seutellum black, 

 abdomen yellow and black ; legs and antennae yel- 

 low ; length 5 mm. ; male 50. .1 u c u n d u s 



// Thorax yellow with a blackish V-shaped mark on the 

 dorsum ; abdomen yellow with black band on pos- 

 terior margins of segments 1 and 2 ; fourth and 

 part of fifth black ; metatarsus 1.25 times as long 

 as the fore tibia (St Vincent Island) 



51. 1 o n g i m a n u s 

 hh Thorax with grayish, brownish or ferruginous stripes 

 i With an oval lobe or mace shaped prominence on each 

 abdominal segment; wings with faint cloud on cross- 

 vein ; length 7.5 nnu 52. 1 o b i f e r u a 



