MAY FLIES AND MIDGES OF NEW YORK 195 



11 The fore metatarsus less than 1.4 times as long 



as its tibia 

 iu Yellow or whitish species 



n Deep yellow species ; female with greenish 

 tinged abdomen ; male with brown abdom- 

 inal fasciae ; fore metatarsus about 1% 

 times as long as its tibia ; length 4 to 



5mm 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. 



inm 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 n. sp. 



nn Joints of legs without distinct black apices 

 o Fore 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 



oo Fore femora noticeably longer than the 

 tibiae ; fore tarsi of male bare 



48. dux n. sp. 



gt> Abdomen bicolored, each segment with crossbands or 

 marked incisures which may be light or dark, yellowish 

 or brownish 

 // Thorax with wide' black stripes 



/ Species over 7 mm. in length ; thorax green or greenish 



yellow in ground color ; thoracic stripes shining ; 



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



blackish; crossvein clouded. .. .49. viridicollis 



U Species 5 mm. or less in length 



; Thorax reddish with black stripes ; scutellum black, 

 abdomen yellow and black ; legs and antennae yel- 

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



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

 dorsuni ; abdomen yellow with black baud 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. longirnanus 



li h 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 mm 52. 1 o b i f e r u s 



