EEV. A. E. EATON OX EECENT EPHEMKEID.E OE MAYFLIES. 281 



warm sepia-brown. Hinder femora, in opaque view, testaceous or very light browu- 

 ochreous, banded broadly in the middle and rather broadly at the tip with brown-black ; 

 tibise brown-ochreous ; tarsi brown-black. Wings vitreous, tinged in the pterostigmatic 

 region of the fore wing with liglit bistre-grey ; neuration either pitch-brown or very 

 dark rufo-piceous ; the cross veinlets interjacent between the fore costa and the pobra- 

 chial (7) are most of them slightly thickened, and those of the pterostigmatic space are 

 simple and straight. 



? . Similar to 6 . Length of body, 6 12 ; wing, j 13, ? 14-5-18 ; seta?, d 35 mm. 



Sab. The St. Lawrence (Walker) ; Chicago and Washington (Hagen) ; Savannah 

 (Ostcn-Sacken). I did not compare the subimagines described respectively by Hagen and 

 Walker ; and have only quite lately come to consider them to be of one species. 



EUROPEAN AND ASIATIC SPECIES. 



* Penis-lobes broudhj expanded outwards at the tips. 



EcDTTjRUS Krtjeperi, Stein. 



X Putamantfiiis Krueperi, Stein, Berlin, ent. Zeit. vii. 411 (1.S63). 

 ? Lcptnphlebia Krueperi, Etn., Trans. Ent. Soc. London (1871) 86. 

 I Baetis Krueperi, Stein MS., Etn., op. cH. (1873) 395. 



Imago (dried), d . — Notum dark pitch-brown, approacliing intense burnt-umber. 

 Dorsum of abdomen bright brown-ochre, approaching in some lights Mars-yellow ; the 

 joinings of the segments appear slightly opaque, and oblique dark lateral stripes of the 

 ordinary description are faintly indicated in segments 2-7 or -8 [tlie specimens described 

 are aged and doul)tless faded] ; the ventral nerve-ganglia are visil)le. Setae whitish 

 brown-ochre, browner towards the roots ; their joinings light pitch-brown and, in the 

 lighter portion, alternately narrow and broad. Fore leg, in opaque view, pitch-brown. 

 Hinder femora, in opaque view, light raw-umber brown, thetibiEB rather lighter, the tarsi, 

 in some lights, nearly concolorous with the femora. Fore wings vitreous, tinted faintlv 

 throughout the disk with whitish raw-umber, but more distinctly tinged with light 

 raw-umber at the roots and in the marginal and submarginal areas, and especially so at 

 the commencement of the pterostigmatic space ; the cross veinlets of this space are 

 branched, and anastomose evenly with one another. Hind wing conspicuously tinged with 

 light raw-umber brown, darkest towards the terminal margin. Wiug-neuration, in 

 opaque view, for the most part pitch-brown ; but the near extremities of the longitudinal 

 nervures jiosterior to the radius (3) in both wings, the whole of the costa of the hind 

 wing, and the extreme base of the costa in the fore wing are light raw-umber. 



2 . Notum dark brown-ochre. Abdomen discoloured ; the oblique stripes at the sides 

 jf the segments are piceous, and the spaces below them are of a light colour. Setfe 

 lefective, piceous at the base, with opaque joinings. Legs similar to those of d in 

 colour, but with the hinder tibiae darker. Fore wing very similar to that of the d , but 

 ess distinctly discoloured along the costa. Hind wing as nearly colourless as the fore 



SECOND SERIES. — ZOOLOGY, VOL. III. 38 



