REPORT OF THE STATE ENTOMOLOGIST I907 I93 



Length, 4.5 to 5 mm ; setae about as long, or the middle one slightly 

 longer. Foreleg, 6 mm; expanse of wings, 10 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 i, 1905. 



Heptagenia pulchella. This species was common here, as at 

 Saranac Inn, and my collection of it shows a number of dates 

 running through July and August. 



Heptagenia 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, 8-10 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 half [see pi. 10, fig. 5]. 



Nymph. Measures 13 mm in length ; setae 4 mm additional; 

 antennae i 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, 



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