REPORT OF THE STATE ENTOMOLOGIST I907 193 
Length, 4.5 to 5 mm; setae about as long, or the middle one slightly 
longer. Foreleg, 6 mm; expanse of wings, Io mm. 
Color clear brown; paler beneath, with the eyes blackish in- 
feriorly. Wings hyaline, except the extreme base, which is of an 
amber tint. Legs white except the forefemur which is brown, and 
a pale brown spot at the apex of the foretibia. Forseps beyond 
the base, and setae white, the latter with a few of the basal articu- 
lations narrowly annulate with brown. Abdomen transparent, 
whitish ventrally and to a less extent dorsally on the middle seg- 
ments, the sides of the dorsum being tinged with brownish purple. 
Many specimens, all males, taken swarming July 1, 1905. 3 
Heptagenia pulchella. This species was common here, as at 
Saranac Inn, and my collection of it shows a number or dates 
running through July and August. 
Hieptagenia interpunctata. This species was taken by our 
trap lanterns from Moose river on the west side of the town, and a 
number of adults were taken from the hatchery walls. 
Ephemera varia. Only a few specimens were seen, and these 
were taken by trap lantern from Moose river back of the town. 
Potamanthus diaphanus n.sp. Under this name I describe 
an interesting species collected by Dr Betten at Squaw Island in the 
Niagara river near Buffalo on the 24th of July, 1906. 
Length, 8-1o mm; expanse, 20 mm; setae of the male, 18-20 mm; 
fore leg, 13 mm; body and wings pale yellowish white, hardly 
darker on the top of the head and thorax but with a satiny sheen 
on the thorax and on tip of abdomen; tips of femora, tarsi and 
tibia very faintly infuscated, a subapical inferior spot on the fore- 
tibia being more distinct; setae, white, with the incisures scarcely 
darker; forceps white; eyes and ocelli, black; forceps of the male, 
regularly arcuate; basal segment twice as long as the two terminal 
ones together and rugose within: inner appendages united almost 
to the tip, half as long as forceps, with a W-shaped apical outline. 
The lateral margins are contracted in the middle and narrower, with 
parallel sides, in the basal halt [see Die kon iceuy| 
Nymph. Measures 13 mm in length; setae 4 mm additional ; 
antennae 1 mm long, their tips hardly surpassing the prongs of 
mandible, which unlike those of other species of the genus hitherto 
described, are longer than the head. Each prong is contracted just 
_ beyond the base and terminates in a straight, bare, brown point. 
Body elongate; little depressed; prothorax wider than the head, 
with broadly rounded, flaring lateral margins; fore legs longer than 
the others; the tibia much longer than the femur, beset with long 
hairs internally, and bearing a stout, straight apical spur, almost 
half as long as the tarsus; middle legs shorter and more slender 
than the hind legs; abdomen regularly tapering posteriorly; gills 
rudimentary on the first segment, almost equal on segments 2 to 6, 
7 
