130 EEY. A. E. EATON ON EECENT EPHEMEEID^ OE MATELIES, 



Sal). St. Martin's Falls, Albany River, Hudson's Bay (Dr. Barnston) ; 3 examples in 

 Brit. Mus. 



Ephemeeella excrucians, Walsh. 



Ephemerella [type] excrucians, ! Walsh, Proc. Acad. Nat. Sc. Pliilad. (1862), 377; Hag-, Proc. Ent. 

 Soc. Pliilad. ii. 178 [im^).—E.Xinvana (part), 1 Etn., Trans. Ent. Soc. London (1871), 100. 



Subimago [dried). — Wings very light ochraceous grey, changing in some postures to 

 whitish grey, with suhopaque neuration of a similar whitish- or faintly whitish yellow- 

 amber tint, c? femora in opaque view light yellow-ochre, changing to light yellow-amber 

 in transmitted light; tibia; and tarsi dull whitish, the ungues and ends of the tei-minal 

 joints of the hinder tarsi brownish, the fore tibia and tarsus in opaque view dull brownish, 

 but in some lights dull yellowish ; legs of ? lighter, with pale brownish ungues. Setae 

 light sepia-grey, their joinings at most opaque. 



Imago, (S . [Oculi in life [fide "Walsh) egg-yellow above, pale fuscous below.] — 

 {Dried) : — Thorax above piceous or light rufo-piccous : abdomen rufo- or fusco-piceous 

 above, with opaque joinings, the last two segments tinged with dull light reddish orange ; 

 venter greyish or yellowish, the last two or three segments and the bases of the forceps 

 light brown ochreous. Setoe whitish, with fuscous joinings. Wings vitreous, with 

 colourless neuration. Hinder femora very light yellow-amber ; fore femora darker, and 

 of a browner yellow-amber in opaque view; hinder tibice and tarsi dull yellowish or 

 brownish white, the tips of the tarsi and the ungues light brownish ; fore tibia in opaque 

 view dull yellowish brown, with a light brownish spot at the tip, the tarsus rather lighter, 

 with brown ungues, but in transmitted light they are both brown-ochreous white, the 

 tibia becoming light yellowish amber towards its base, but marked at the tip, as before, 

 with the opaque brown spot. 



2 (dried). — Body yellow-ochreous, the head, pronotum, and abdomen sometimes red- 

 dened, the abdominal joinings subopaque or darker than the rest of the segments : on 

 each side of the pronotum, close to the hinder border, directly in front of the sutural 

 ftirrow in advance of the wing-roots, is a raised reddish-brown dot. Legs similar to the 

 hinder legs of the d . Wings \dtreous, with colourless or whitish neuration, the fore 

 wings with 9-11 cross veinlets in the marginal area beyond the bulla (counting them 

 along the subcosta). Setae white, sometimes with the first 2 or 3 joinings reddish. 

 Venter nearly of the same colour as the femora in segs. 1-7, and then darker ; the lobe 

 of the 9th segment broadly rounded off and almost entire. Length of body (after 

 Walsh), B-5-7-5 ; wing, 6-8 ; setae, 6 im. 11-13, 2 9-12-5 millim. 



Eab. Eock Island, 111. (Walsh) ; Detroit, Mich. (Mus. Comp. Zool. Cambridge, Mass.). 

 Two 6 im. in the Brit. Mus. were named by Mr. Walsh. 



Ephemerella consimilis, Walsh. 



Ephem.erella consimilis, Walsh, Proc. Acad. Nat. Sc. Philad. (1862), 378 ; Etn., Trans. Ent. Soc. 

 London (1871), 100. 



According to Mr. Walsh, this insect differs from E. excruoiaiis in the form of the 

 mesothorax, which in E. consimilis is 4-5 times as long as wide instead of less than thrice 



