MAY FLIES AND MIDOES OF NEW YORK 141 



processes, each with a pair of pale, slender filaments, and on the 

 lateral margin of each of the last two segments are four or five of 

 such filaments. 



Imago. Male and female. Pale yellow, wings marked, legs 

 pale yellow. Length 3 to 5 mm. 



Male. Head pale yellow, including basal joint of the antenna. 

 Antennae yelloAvish brown, eyes black, pali)i and apex of the 

 proboscis fuscous. Thorax pale yellow with three wide buff- 

 colored stripes; or it may be said that the dorsum of the thorax 

 is buft-colored, having three fine whitish lines, upon each of 

 which there is a close row of pale hairs. In some lights the 

 anterior part of the thorax, a space in front of the scutellum 

 and the scutellum have a whitish sheen. Pleura, metanotum 

 and sternum are yellow or buff-colored, the first has 3 brownish 

 bars or spots; the last has its sides brownish. The abdomen is 

 pale yellow; near the anterior margin of each segment is a trams- 

 verse row of brown spots; these are sometimes confluent and 

 thus form bands; the last two or three segments are more 

 brownish. Genitalia conspicuous, pale yellow. The hairs on 

 abdomen and genitalia pale. Legs, including coxae, cream- 

 white, the hairs pale, apex of each tibia with a very minute black 

 comb with one tooth prolonged into a spur. Fore metatarsus 

 more than three-fourths as long as its tibia. Wings hairy; a 

 brown cloud covering the crossveins, a larger paler cloud at the 

 tip of Ri extending nearly across the wing, but very faintly 

 beyond the media ; a third faint cloud at the apex of Cuo extend- 

 ing to the media ; a fourth very faint one in the anal cell. Veins 

 pale, except the crossveins which appear dark. Some of the 

 spots on the wing in some specimens coalesce so their wings 

 may be said to have two cross bands. Ilalteres white. 



Female. Differs from the male in having pale yelliow anten- 

 nae; palj)i siometinies pale, abdomen yellow, the posterior margin 

 of the segments with a whitish sheen. The wings are broader. 



Var. a. female. Differs from the above in having the anterior 

 end of all three dorsal stripes tipped with dark brown, and two 

 small dark brown spots on the middle of the median stripe. 

 Metanotum with a white central line, pleura with three brown 

 dashes, two vertical and one horizontal. Several specimens. 

 Ithaca N. Y. 



Var. 1). female. Differs from a typical specimen in having a 

 deeper yellow thorax, brownish stripes, yellowish brown meta- 

 thorax, pleura and sternum yellowish brown or brownish. 

 Abdominal segments with indistinct yellowish posterior mar- 

 gins. Legs yelloAv, last two tarsal joints infuscated. SeveraJ 

 specimens. Ithaca N. Y. 



