MAY FLIES AND MIDGES OF NEW YORK 199 



cc Abdomen brown with paler margins 



d With inetathorax black, femora yellow, tarsi dark, wings with the 



usual spot; hairy? Length 5 mm. ; male 72. lasiopus 



dd Not as above 



e Thorax reddish, striped, with two white side stripes; pleura 

 hoary ; scutelluin pale red ; legs pale tawny ; tips of thighs, 

 shanks, and feet darker ; wings bare. Length 6 mm. 



70. albistria 

 ee Thorax testaceous with three brown stripes; pleura pale with 



dusky spots; abdomen with spots on sides of last two seg- 

 ments; middle and hind tibiae dusky; wings unspotted (see 



Orthocladius) oceanicus Packard 



Abdomen, basal half at least, yellow or green, no black markings on 



anterior segments 

 c Wings with a brown cross band ; body straw-colored ; length 3 mm. ; 



male (habitat unknown) 73. h i 1 a r i s 



cc Wings without band 



d With brownish or reddish abdomen and thorax 

 e Fuscous species 3.5mm. long; male; wings hairy? 



71. brunneus 

 ee Abdomen brown with broad, dingy, yellow bands on posterior 



part of the segments ; metathorax black ; wings with stigma ; 



hairy? Length 5 mm 72. lasiopus 



dd With yellow or greenish thorax and abdomen 

 e Species 5 mm. or more in length 



f Large species 9mm. in length, with green thorax; abdomen 

 yellow ; wings white ; hairy? (See the genus Eurycne- 



mus) lasiomerus 



ff Species 5 to 6 mm. in length 



g Saffron or pale orange-colored species ; legs pale yellow ; 

 wings hyaline, fringed, hairy? Female. (See the genus 



Eurycnemus) unicolor 



gg Thorax silky white with three tawny stripes; abdomen 

 yellow, last two segments dull ; legs yellow, a tawny 

 band around each thigh ; wings hairy?... . .74. a n t i c u s 

 ee Species 2.5 mm. or less in length 



f General color citron yellow ; the thoracic stripes each with a 

 black dot at tip ; wing bare? Length 2.25 mm. 



75. b i m a c u 1 a 

 ff Without black dot at tip of each thoracic stripe 



g Thorax pale yellowish green, with three dull red stripes; 

 metathorax brown ; length 2 mm. ; male and female ; 



wings hairy? 76. c o n f i n i s 



gg General color yellowish green 



h Length 1.5 mm. ; antennae pale brown ; wings deeply 



fringed; hairy? 77. pel lucid us 



hh Length 2 mm. ; antennae yellow ; male ; wings hairy? 



78. trichomerus 



