222 EEV. A. E, EATON ON EECENT EPHEMEEID^ OE MATELIES, 



Fore wings vitreous, their neuration pitcli-black somewhat brownish at the wing-roots. 

 Hind wings transjiarent at the base, but largely occupied by a broad transverse trans- 

 parent pitch-brown band (an hypertrophied bordering of the terminal margin) which 

 extends from terminal margin to rather beyond the fork of the praebrachial nervure (6), 

 and right across the wing from the costa, following the edge of the wing some distance 

 further in along the inner margin ; neuration pitch-black, Pemora and tibiae in opaque 

 view light bistre-brown or lu'onze-brown, the tibiae in some positions appearing light 

 or pale dull brownish yellowish ; tarsi brownish white, the ungues, terminal joint, and 

 distal borders of the other joints, light burnt-umber or reddish brown. Length of body, 

 ? 10, wing 12'5, setae about 12 mm. 



Sab. New Hampshire (Whitney, in Mus. Comp. Zool. Cambridge, Mass.). The con- 

 spicvious colouring of the hind wings enables this species to be distinguished at a 

 glance. 



SiPHLTJRTJS TYPICUS, Sp. nOV. 



Subimago {dried). — Wings uniformly light bistre-grey, with light bistre-brown longi- 

 tudinal neuration ; the nervui-es paler close to the wing-roots. Setae in opaque view 

 bistre-brown, with piceous joinings. Body pitch-brown. 



Imago {dried). — 6 . Notum almost intense brown-ochre, but browner. Dorsum of 

 abdomen in opaque view bistre-brown, modified in segments 7-10 with light brown- 

 ochre; in oblique view the predominant colour changes from bistre- to raw-umber 

 brown, and segments 2-6 become more translucent than the others, especially at their 

 bases ; the darker colour in them occupies the middle of the back continuously as a broad 

 longitudinal stripe, extends laterally therefrom along the joinings, and then is suddenly 

 dilated midway towards the jilcurae so as to form a quadrangular sj)ot bounded behind by 

 the terminal margin and below by the hinder half of the lateral margin of the dorsal arc, 

 thus filling the posterior lateral angle ; from the upper anterior angle of this spot a dark 

 streak is produced horizontally to the base of the segment, dividing the pale space there- 

 abouts into a sub quadrangular spot at the anterior lateral angle of the segment, and a 

 longer portion beside the dark median stripe ; in segment 7 the corresponding pale spaces 

 are much more circumscribed in extent. Venter pale, in segments 8 and 9 modified with 

 brown-ochre or ferruginous, and marked faintly sometimes in segments 2-7 with fine 

 lines convergent towards the base of the segment, or U-shaped markings of the pattern 

 common in this genus, which in other specimens are not traceable. Porceps-basis pale 

 in the middle ; its lateral borders and the forceps-limbs light brownish. Setae whitish 

 warm-sepia, with piceous joinings. Pore femur and tibia in opaque view light raw- 

 umber brown, the latter opaque or redder at the tip ; tarsus whitish, with narrowly 

 piceous joinings, and with the terminal joint and ungues tinged very faintly with warm 

 sepia-grey ; in transmitted light the raw-umber changes to yellowish amber. Hinder 

 femora and tibiae very light raw-umber brown ; the tarsi whitish, tinged (especially in 

 the terminal joints) with warm sepia ; their joinings and ungues light reddish. Wiugs 

 vitreous, with a small brownish cloud along the axillar fold of the fore wing ; neuration 

 pitch-black, excepting the fore wing-roots and the bases of the main nervures, and also in 



