REV. A. E. EATON ON EECENT EPHEMEEID^ OE MAYFLIES. 33 



SPANIOPHLEBIA, Etu. 1881. 

 Illustrations. Adult (details), PI. III. 4. 



Adult. — Anal nervure of the fore wing forked ; the membrane decvirrent from the 

 wing-roots terminated by a free epinotal appendage ; cross veiulets comparatively nume- 

 rous in the anterior portion of the wing ; the nervure next in advance to the anal (8) 

 deeply forked. Aperture of the anterior thoracic spiracle fissure-like and gaping in 

 front (in the dried insect), closed by a single, large, arched, dorsal valve rounded at the 

 edge ; the anterior and lower margins of the orifice meeting in front at an angle, without 

 valves ; that of the posterior spiracle is large, roundly subti-iangular, and valveless, with 

 a small salient lobule projecting from its front edge. Setai 2. Hinder lateral angles 

 of the intermediate abdominal segments shortly prolonged into slender projections that 

 are easily broken off. Fore tibia of 6 about as long as the femur ; the proximal joint 

 in every tarsus longer than the second joint. Eyes of d hemispherical, relatively small, 

 remote from each other above ; the foremost ocellus rather smaller than the others. 



Distribution. Tropical South America. 



Type. S. Trailice. 



Etymology , a-aavwc and ^\ki^wv, from the scanty cross neuration. 



Differences in the neuration of the fore wings of the two species provisionally placed 

 in this genus are specified in the descriptions. There ai'e other incongruities between 

 them. The s Brazilian species has pilose seta) about as long as the body ; those of the 

 Ecuador d are pubescent, and about 2^ as long as the body. The latter certainly 

 possesses the epinotal appendages mentioned above ; but these are not so surely ju'escnt 

 in the Brazilian. 



Spaniophlebia Traili^, Etn. Plate III. 4 (wings, legs, and forceps, d ). 



Spaniophlebia [type] Trailhe,\ Etn., Ent. Mo. Mag. xvii. 191 0881). 



Imago (dried and in alcohol), d . — Body pitch-brown, the thorax darker than the 

 abdomen ; the latter with the tenth dorsal segment, and the lateral borders of the other 

 segments above the spiracular margin as dark as the thorax, but with the joinings of the 

 segments pale. Setie, in the dried specimen pitch-black, with testaceous pilosity ; but in 

 the specimen in fluid both are testaceous ; forceps whitish. Legs pitch-black, the ungues 

 of the hinder tarsi whitish : in alcohol the legs from the coxa to the knee are light pitch- 

 brown, and the rest of the tibia with the tarsus dirty white. Wings transparent, tinted 

 throughout, very faintly indeed, with smoky-grey, so as scarcely to diminish their lim- 

 pidity, and giving a light blue-purple or (in other positions) a mauve reflection ; 

 neuration piceous, the quasi-subcosta (no. 3) of the fore wing, distaUy, and the cross 

 veinlets that join it, margined for some distance with intense warm sepia-brown, which 

 colouring occupies the pterostigmatic space, and imparts a slight tint to the rest of the 

 marginal area. The nervure (pobrachial ?) in front of the anal (8) of the fore wing, is 

 forked before the middle, at about the same distance from the wing-roots as the anal 

 ner^oxre, and is met nearer the base of the wing by one of two simple nervures interposed 



SECOND SERIES. — ZOOLOGY, VOL. III. ^ 



