66 EEV. A. E. EATON ON EECENT EPHE]\£EEID.E OE MAYFLIES. 



liglit fuscescent, tlie joinings subopaque. Porceps browu-ochreous. Trochanters eacli 

 with a small black dot oiitside ; fore femur rufo-piceous, greyish towards the base above ; 

 fore tibia and tarsus piceous ; hinder femora somewhat brown-ochreous, the tibise and 

 tarsi lighter, the ungues fuscescent. Wings transparent, tinted with very light dull 

 yellowish ; fore wing with the costa, subcosta, and radius rufo-piceous, the other longi- 

 tudinal nervures light yellowish, the cross veinlets black ; the pterostigmatic portion of 

 the submarginal area, and the adjacent (outer) half of the corresponding part of the 

 marginal area, together with the extreme apex of the third area from the costa, burnt- 

 uml)er brown ; the same colour occupies the basal portion of the submarginal area to a 

 little beyond the great cross vein, and extends onwards from thence for some distance 

 along the subcosta and radius, and more or less distinctly borders the cross veinlets, 

 besides giving rise to the usual spotting of the wing ; the spots are small and distinct. 

 Hind wings with the longitudinal nervures pale yellowish excepting the subcosta towards 

 the base, which is fuscescent ; cross veinlets mostly black, several of tliem faintly bor- 

 dered with burnt-umber grey, and a few marked with minute burnt-umber brown spots ; 

 the outer margin broadly edged with brownish grey. Length of wing 15 mm. 



Hab. l^oot Hills, Colorado (Lieut. W. L. Carpenter), in Mus. Comp. Zool. Cambridge, 

 Mass. 



Ephemera guttulata, Pict. Plate LXIII. 12/ (forceps). 



Epheme7-a ffuttulata, Pict., Hist. Nat. Nevropt. ii. Epliem. 135, pi. viii. 4 (1843-5) ; Walk., List of 

 Neuropt. lus. iu Brit. Mus. 536 (1853) ; ! Hag., Ann. Rep. U. S. Geol. & Geograph. Survey of the Terr. 

 1873, part iii. Zool. 579 (1875). — Ephemera, sp. nov., ? , ! Hag., rroc. Ent. Soc. Philad. ii. 177 (18G3). — 

 E. I myops, var. ? Etn., Trans. Ent. Soc. London (1871), 71 ; Hag., op. cit. (1873), 393. — E. % simulans, 

 ! Provaneher, Nat. Canad. viii. no. ix. 265 (1876) ; id., Fn. Ent. d. Canad. ii. fasc. i. 81 (1877). 



Imago (dried), 6 . — Thorax above rufo-piceous, varied with piceous, inclining towards 

 intense bistre-brown on the pronotum. Abdomen above, in segments 1-8, spotless 

 whitish Naples-yellow ; segment 9 of the same colour, excepting along tlie spiracular 

 border, where it is narrowly margined with raw-umber brown ; segment 10 raw-umber 

 brown, with a longitudinal whitish yellow stripe in the midst of each side. Venter from 

 the tip of segments 1-8 of the same colour as the dorsum, segment 9 ditto, with a trian- 

 gular spot on each side as long as the segment tinged with raw-umber brown ; segment 

 10 raw-umber, but the thinner portions of the perinseal lobes whitish yellow. Forceps 

 raw-umber, the second joint lighter. Set^e, in opaque view light Vandyke-brown, with 

 blackish joinings. Pore legs lost, excepting the coxae and trochanters, which resemble 

 the hinder. Hinder legs, in opaque view, light yellowish, with a blackish spot at the end 

 of the tibia, the ungues (if not the whole tarsus) light reddish brown, the trochanter light 

 bistre-brown, and the coxa outside in front rufo-piceous. Wings imperfectly transpa- 

 rent, marked in opaque view with dark bistre- or pitch-brown, changing in transmitted 

 light to light sepia-brown, the markings consisting of a broad, slightly mottled cloud 

 extending from the anal angle to the apex of the fore wing along the terminal margin, 

 the pterostigmatic region, broad bordering to all the cross veinlets in the rest of the fore 

 wing anterior to the anal nervure (8), and narrower bordering to those posterior to it, as 



