254 EEV. A. E. EATON ON RECENT EPHEMEEID^ OE MAYFLIES. 



Imago {dried), d . — Similar in general aspect to Heptagenia sulplmrea. Notum very 

 pale yellowish ochre, traversed lengthwise by a median reddish brown-ochre stripe 

 approaching raw-umber. Dorsum of the abdomen in segments 2-5 and the base of 

 segment 6 transparent whitish shaded with greenish bistre-grey, with the joinings of the 

 segments narrowly subopaqvie and of a darker shade of the same grey ; the remainder 

 of segment 6 and the hinder dorsal segments nearly concolorous with the notum. 

 Venter uniformly pale yellowish ochre. Tore femur in opaque view light bronze-brown 

 approaching raw-umber, darker and light red dish -brown just at the knee, and very 

 indistinctly banded in the middle with the same colour; tibia in some positions 

 concolorous with the femur, but in other positions both it and the tarsus appear lighter, 

 and the tip of the tibia, the last joint and joinings of the tarsus, and the ungues are 

 rufo-piceous or of a dull reddish tint : in transmitted light the prevailing colour of the 

 leg is light yellowish amber, and the markings are reddish amber. Hinder legs rather 

 similar in colour and markings to the fore leg, but lighter, and without any trace of the 

 median femoral baud or any spot at the tip of the tibia. Wings vitreous ; the fore wdng 

 tinted slightly with light greenish- or bistre-grey in the pterostigmatic region, and more 

 faintly still in the remainder of the marginal and submarginal areas : neuration in 

 opaque view piceous or black, excepting the subcosta and radius in the basal half of the 

 fore wing, which are yellow-amber ; in some positions the longitudinal neuration appears 

 pitch-brown, and the cross veinlets black : in transmitted light the greater part of the 

 neuration appears brown-amber : the great cross vein of the fore wing is thickened 

 posteriorly and piceous. 



$ . Light yellowish ochreous like Ileptagcnia stdjihurea. Head marked on each side 

 with a small triangular black spot at the anterior low^er angle of the ocidi, and with a 

 reddish brown mark close to the orbit in the midst of the vertex. The rugie at the sides 

 of the thorax between the wing-roots and the legs are edged with black, as in the 6 . 

 Legs rather stronger in colour than iu the other sex, the femora being transparent 

 greenish grey and having the median band, though faint, better defined. Length of 

 body (shrunken) 6 ; wing, j 9, ? 10 mm. Seta) defective. 



Hab. Arkansas Canon, Colorado (P. 11. Uhler, in Mus. Comp. Zool. Cambridge, 

 Mass.) ; Arizona (M°Lach. Mus.). 



E-HiTHKOGENA viTREA, Walker. 



t Palingenia vitrea, ! Walk., List of Neuropt. Ins. in Brit. Mus. part iii. 555 (1853). 

 Heptagenia vitrea, ! Etn., Ti-ans. Ent. Soc. Loudon (1871) 143, note. 



Stibimago {dried), ? . — Wing-membrane very light smoky grey, the neuration extremely 

 light brown-ochraceous. Body light brown-ochreous ; the legs nearly of the same 

 colour, each femur banded in the middle with black-grey, and light brownish at the 

 knee ; fore tarsus light w^arm scpia-brow^n. In the marginal area of the fore wing are 

 6-7 cross veinlets before the bulla, and 15-17, simple and straight, beyond it. Length 

 of body 6 ; wing 6 mm. 



Sab. St, Martin's Falls, Albany River, Hudson's Bay (Brit. Mus.). 



