198 EEV. A. E. EATON ON EECENT EPHEMERID^. OE MAYFLIES. 



species, but of a similar colour : front margin of the fore wing mottled, in the manner 

 prevalent in the genus, as far as the radius (3) ; posterior to this nervure, from the 

 neighbourhood of the bulla of the subcosta, a curved narrow fascia extends transversely 

 to about the anal angle ; this fascia is partly confluent with an irregular blotch of mode- 

 rate dimensions, seated upon the pobrachial (7) nervure and spreading on both sides to 

 the neighbouring intercalary nervures, but not nearly to the terminal margin ; the same 

 fascia is preceded by a blotch at the wing-roots, and another smaller blotch in the vici- 

 nage of the conjunction of the sector (4) and cubitus (5), and is united to the latter by 

 a narrow projection of the colouring along the cubitus : immediately after the fascia is a 

 large subtriangular blotch, which extends outwards along the radius as far as the com- 

 mencement of the pterostigmatic region of the wing, and transversely from the radius to 

 the sectorial intercalar next to the cubitus ; this blotch contains a clear space ; a band 

 of colouring, parallel with the terminal margin, extends from the sector (4) to the prae- 

 brachial (6), and touches the lowest extremity of the last-mentioned blotch. The rudi- 

 mentary intercalar veinlets of the terminal margin of the fore wing are paired. Hind 

 wings similar to those of C. Sellackl, but somewhat clouded. 



$ . Eyes olive-brown. Abdomen light yellow, or at most brownish yellow. Wing- 

 nervures brownish. [Weyenbergh ; abstract translation.] Length of body 6-7 ; wing 

 5"5-9 ; seise, 2 iui. from 8 to 9 mm. and upwards. 



Ilab. Brazil (Pict.) ; Cordova, Argentine Republic (Weyenbergh & Hag. Mus.). In 

 autumn ; comparatively scarce ; not associated with C. Sellacki (Weyenb.). Dr. Hagen's 

 specimen was no longer with me when Prof. Weyenbergh's paper arrived. This species 

 is smaller than the following, and has the cross veinlets of the fore wing rather diffe- 

 rently arranged {cf. Weyenbergh's figures). 



CALLiBiETis Sellacki, Weyenbergh. 



Cloe Sellacki, Weyenb., Tijdschr. v. Ent. xxvi. 1882-3. p. 161, pi. x. 3 (1883) [wings]. 



Imago {Umng). — 6 . Eyes dark brown above. Thorax yellowish green, with a broad 

 longitudinal median green stripe on the notum, which often appears sepia-colour edged 

 with darker. Abdomen very light brown above, darker or reddish brown at the tips and 

 in the midst of the segments, and with oblong black spots at the stigmata ; venter very 

 pale, with colourless forceps. Setae [whitish ?] annulated distinctly at the joinings with 

 light sepia-colour towards their roots, but less distinctly so towards their extremities. 

 Legs light brown, with the femora almost colourless above [ ? towards their bases] ; fore 

 legs of 6 almost yellow. Wings ornate in both sexes : neuration light brown. The 

 light brown markings of the fore wing are mottled, in the usual manner, with rounded 

 clear spots enclosing single cross veinlets along the costal border, and occupy a very 

 large proportion of the remainder of the wing posterior to the radius ; they comprise a 

 blotch at the wing-roots, nearly contiguous with another protuberance from the said 

 border, which just overlaps the prsebrachial (6) nervure, followed closely by a broad 

 transverse fascia, nearly in the middle, which crosses the wing and terminates at the 

 anal angle ; that fascia is followed directly, at the costal border, by two abbreviated 

 confluent bands, which by their combination compose a large irregularly triangular 



