MAY FLIES AND MIDGES OP NEW YORK 199 



cc Abdomen brown with paler margins 



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

 usual spot ; hairy ? Length 5 mm.; male 72. 1 a s i o p u s 



dd Not as above 



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

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

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



70. a 1 b i s t r i a 



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 



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

 anterior segments 

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



male (habitat unknown) "^3. 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 T2. lasiopus 



dd With yellow or greenish thorax and abdomen 

 e Species 5 mm. or more in length 



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

 yellow ; wings white ; hairy? (See the genus E u r y c n e - 



mus) • lasiomerus 



ff Species 5 to G mm. in length 



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

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



Eurycnemus) u nice lor 



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 2mm.; male and female; 



wings hairy? 7G. confinis 



gg General color yellowish green 



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



fringed; hairy? 77. pellucidus 



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



78. t r i c h o m e r u s 



