420 NEW YORK STATE MUSEUM 



cc Head with a frontal promiueuce; gill rudiment on the first abdominal 

 segment bifurcated, shaped like a tuning fork 

 d Frontal prominence rounded ; the flattened fore tibia with a broad, 

 rounded lobe at its apex, close behind the apical burrowing hook 



H exage nia 



dd Frontal promiuence bispinous ; no conspicuous lobe at the apex of 



the fore tibia behind the apical burrowing hook... Ephemera 



I describe below the nymphs of seven species of May flies, repre- 

 senting as many genera, bred at Saranac Inn. The only bred North 

 American nymph of which I find description is the singular B a e t i s c a 

 o b e s a Say, which is figured by Walsh, Vaysseire and Eaton. A number 

 of undetermined American nymphs, mostly from the Cambridge museum 

 of comparative zoology, are figured and described in Eaton's monograph. 

 One of these I have been able to identify as Ephemerella 

 excrucians, described below. 



Heptagenia pulchella Walsh 



Plate 15, figure 15 



1862 Palingenia pulchella Walsh, Acad. nat. sci. Phil. Proc. p. 375 



(original description) 



1863 Palingenia pulchella Hagen, Ent. soc. Phil. Proc. 2:177 (note) 

 1863 Palingenia pulchella Walsh, Ent. soc. Phil. Proc. 2:203 (note) 

 1863 Heptagenia pulchella Walsh, Ent. soc. Phil. Proc. 2:204 (merely 



refers it to Heptagenia) 



1871 Heptagenia pulchella Eaton, Ent. soc. Lond. Trans, p. 141 (de- 

 scription in Latin from the original by Walsh) 



1885 Heptagenia pulchella Eaton, Linn. soc. Loud. Trans. (2) 3:299 (a 

 very full description) 



1892 Heptagenia pulchella Banks, Am. ent. soc. Trans. 19:347 (listed) 



Images of this species were common in the hatchery windows through- 

 out our session, and during the month of June were most abundant 

 there. A few, mostly males, were taken regularly in the trap lanterns 

 when the weather was favorable. A few others were seen, flying in the 

 twilight. The species was little in evidence, common as it was. 



The nymphs were abundant in Little Clear creek, specially in the 

 more rapid places, clinging closely to flat surfaces of boards, sticks, 

 stones, etc. To collect them one needed but to lift these obstructions 

 from the stream and pick the nymphs from them with forceps. Within a 

 few days after our arrival we had reared some of the nymphs, and others 

 were reared repeatedly after that. Oviposition was not observed. I 

 dissected a female subimago, and counted the eggs in her ovaries in part, 

 and, on the basis of this count, estimated the whole number at about 

 1340. Images and subimagos thrown on the surface of the fish ponds 



