PTERONARCYS. 15 



2. P. regalis ! 



Pteronarcys regalis Newm.! Entom. Mag. V, 176, 1. Newm.! Annals 

 Nat. Hist. XIII, 21. Pictet, Perlides, 134. Ann. Sci. Nat. I, 183. 

 Newport ! Trans. Linn. Soc. XX, p. 425 ; tab. xxi, fig. 1—11 ; 14— 

 17. Froriep, Notiz. XXX, 179. Walker! Catal. 140, 3. P. proteus 

 Pictet, Perl. 128, 1 ; tab. xxix, fig. 1—6. Ramb. Neuropt. p. 449. 



Fuscous, head as broad as the prothorax ; antennse pitchy ; 

 sides of the prothorax emarginate, not broader behind, a narrow, 

 yellow line upon the middle ; feet fuscous ; abdomen fuscous, apex 

 yellowish ; caudal setas fuscous, at base yellowish ; $ last ventral 

 segment yellowish ; 9 antepenultimate segment produced, in the 

 middle a broad, quadrangular excision ; wings grayish-hyaline, 

 before the apex a little clouded with fuscous, veins fuscous. 



Length to tip of wings 44 — 48 millim. Expanse of wings 76 — 

 84 millim. 



Hah. Canada ; Mackenzie and Slave River districts (Richard- 

 son) ; St. Martin's Falls, Albany River, Hudson's Bay (Barnston) ; 

 Philadelphia. 



3. P. biloba! 



Pteronarcys biloba Newm.! Entom. Mag. V, 176, 2. Pictet, Perl. 135. 

 Walk.! Catal. 140, 3. 



Brownish-black ; head narrower than the prothorax ; prothorax 

 not emarginated at the sides, posteriorly a little broadened, a line 

 upon the middle yellow ; feet brownish-black ; abdomen brownish- 

 black, beneath in the middle with a broad, yellowish band ; caudal 

 setse brownish-black ; 9 antepenultimate ventral segment blackish- 

 brown, produced, incised in the middle ; wings grayish-hyaline, 

 before the apex a little clouded with fuscous, veins fuscous. 



Length to tip of wings 46 millim. Expanse of wings 84 millim. 



Hab. Trenton Falls ; St. Martin's Falls, Albany River, Hud- 

 son's Bay (Barnston) ; Minnesota (Osten Sacken). 



I have seen the typical specimens in the British Museum ; but 

 I am not certain whether the female from Minnesota belongs here. 



4. P. nobilis ! 



Pteronarcys nobilis Hagen ! 



Black, head broader than the prothorax ; antennae black ; pro- 

 thorax quadrangular, sides straight, a yellow line narrowed in the 

 middle; feet black ; abdomen black, beneath with a broad orange 



