50 NEW YORK STATE MUSEUM 



2) McCormick ravine, where a puny stream, overhung with 

 witch-hazel and dogwood, flows between deep banks through a 

 hardwood forest; and 3) in a glacial pothole, grown full of 

 buttonbush (C e p hi a 1 a n t h u s) on the top of a moraine. In 

 all these situations the water is fairly permanent, disappearing 

 only in seasons of extreme drouth. 



The species appears to be diurnal in its habits. Males may 

 be found in abundance sitting on top of the leaves of shrubs be- 

 side the water, or flitting over them in the bright sunshine, 

 quickly gathering in companies and dancing up and down, and as 

 quickly dispersing and settling again. They fly at low elevation, 

 and are easily taken in large numbers in a net, and are as easily 

 swept when at rest from the witch-hazel leaves. 



I found the species first in the Skokie May 8, 1901. There 

 were then a very few subimagos on the wing, and a bed of 

 mixed ranunculus and polygonum in the water was fairly 

 swarming with the nymphs. I took a large number home and 

 placed them in a bowl of water, where they began transforming 

 the next day. The subimago stage lasts about 24 hours. 



When Eaton described the species he had some doubts as to 

 whether it i^hould go in L e p t o p h 1 e b i a ; but the characters 

 of the nymph are im essential agreement with those of the typi- 

 cal species of Leptoghlebia, and thus confirm the refer- 

 ence of the species to that genus. In pl.ll, fig.l, is represented 

 the venation, and in fig.2 the $ abdominal appendages are shown. 



The nymph. Length of body, 6,5 mm.; antennae 2 man. and 

 setae 6 mm/additional. Body slender, scarcej-y depressed, widest 

 across the imesothorax, smooth. Face nearly vertical, ocelli in 

 front, eyes rather small situated just before the hind angles of 

 the head ; antennae pale, basal segments rather stouit, the follow- 

 ing ones rather tapering to slender and very fragile tips. Mouth 

 parts very similar to those of O h o r o t e r p e s , shown on 

 pl.5, the maxillae more oblique on the end of the combined 

 Jacinia-galea, and lacking the pectinated spine tipping the former; 

 the palpi, however, are three- jointed beyond the basal palpiger, 

 and the palpi of the labium are two-jointed; thus the conditions 

 of segmentation in these appendages are reversed in the two 

 forms; this segmentation, however, is often very indistinct, and 

 more or less evidence of division of the last segment when there 

 appear to be but two are generally discoverable in all the palpi. 



