40 NEUROPTERA OF NORTH AMERICA. 



Length of body 12 millim. Alar expanse 40 millim. 

 Hob. Washington (Osten Sacken, 1858). 

 Are there three setae ? The unique specimen is very much muti- 

 lated; but it has the fades of an Ephemera. 



PALINGENIA BUKM. 



Three setae, the middle one short, in the males sometimes, almost 

 absent ; wings four, transverse veins very numerous ; eyes remote, 

 simple. 



1. P. hecuba! 



Palingenia hecuba Hagen ! $ Imago. 



Luteous, spotted with fuscous ; head blackish-fuscous, apex of 

 the antennae pale ; prothorax shining fuscous, broad, narrower 

 anteriorly ; abdomen luteous, above blackish-fuscous ; setae thick, 

 whitish-gray, the middle one of equal thickness with the others 

 (partly destroyed) ; base of the feet luteous (the feet are wanting 

 in the specimen); wings large, opaque, grayish-rosy, the costal 

 margin a little obscurer, veins gray. 



Length of body 22 millim. Alar expanse 78 millim. 



Hob. Yera Cruz (Salle). Collection of de Selys Longchamps. 



The largest species yet known. The wings are opaque, but yet 

 it is an imago; and it has a mass of eggs in the vulvar aperture. 



2. P. alba! 



Bxtis alba Say, Long's Narrative, Appendix, II, 305, 3. 



Milk-white ; vertex fuscous ; prothorax transverse, quadrangu- 

 lar, in front truncated, yellowish-white ; anterior feet grayish-fus- 

 cous, the others white ; wings whitish, anterior margin grayish. 



Length of body 11 millim. Alar expanse 22 millim. 



Hob. North Red River (Robt. Kennicott); Winnipeg River 

 (Say). 



"This insect appears in immense numbers;" for a more particu- 

 lar account see Long's Narrative, as quoted above. I have seen 

 only a mutilated specimen. 



3. P. puella. 



Palingenia puella Pictet, Ephem. 145, 2 ; tab. xi, fig. 4. 



Milky-whitish ; ocelli black ; prothorax transverse, short, ante- 



