114 EEV. A. E. EATON ON EECENT EPHEMEEID.5: OE MAYFLIES. 



Imago [teste Gundlach, has in life olive-brown oculi, and a light brown-ochreous body, 

 with a small black or brown spot on each side of every abdominal segment, Hag. MS.], 

 S (dried). Thorax kiteo-fuscous above ; abdomen discoloured, the segments darker at the 

 tips, the venter paler than the dorsum. Setae white, or greyish white, with black bands 

 and joinings, the bands being placed at every joint near the base of the seta, then at every 

 alternate joint, and ultimately, still farther away from the base, at every third joint. 

 Wiags vitreous ; the marginal area of the fore wing, slightly discolom-ed from the base 

 to at least as far as the middle, contains about 7 simple cross veinlets before, and 11 

 beyond the nodal point ; neuration piceous, nearly every cross veinlet marked with a 

 roundish blackened spot. Legs dull pale lutescent, each with two piceous bands on the 

 femur, the tibia black at the tip, and the tarsus sublutescent [" with darker tip to the 

 tarsus," Gundlach, MS.]. Length of body 5-7'o, wing 7"5-8, setae about 10 mm. 



Sab. Eangel Mountains, Cuba, in June (Hag. Mus.). Four ? imagines in the col- 

 lection differ from the d subim, above described in having cross veinlets in the marginal 

 area before, but 9 beyond, the bulla. Their wings are spotless, and their thorax, seem- 

 ingly, is piceous above. They may represent another species. 



HABROPHLEBIA, Etn., 1881. 



Illustrations. — Adtilt (details), PI. XIII. 22 a, b, & LXIV.- (whole figures); consult 

 Pictet, oj). cit. under Potamantlms, pis. 27 & 28 (1843-5). Nymph, PL XXXVI. ; also 

 Pictet, loc. cit., and Vayssifere under H. fusca (1882) [who both omit the tracheal bran- 

 chife of the firsta bdominal segment], 



Adidt. — Hind wing angulated strongly and rather obtusely in front, nearly midway 

 between the wing-roots and the tip ; the angle, almost right-angled, is followed abruptly 

 by a strong sinus, the margin retiring perpendicularly from the A^ertex of the costal 

 protuberance, usually to about halfway towards the subcosta, and thence following a 

 semielliptical curve round the apex of the wing ; the subcosta (2), arising in a gradual 

 curve from the wing-roots, diverges from the common trunk of the radius (3) and cubitus 

 (6), and then with diminished curvature, running subparallel with the radius, usually 

 passes obHquely into the margin shortly before the tip of the wing ; the radius terminates 

 quite in the extremity of the wing ; hence, distally, the marginal area is usually acu- 

 minately prolonged in proximity to the subcosta, and the submarginal is semi-parabolic ; 

 but sometimes, in individual examples of certain species, the hind wing conforms essen- 

 tially to that of Thraulus (PI. XII. 20), the subcosta meeting and terminating in the 

 margin at the sinus, and the marginal area being cori'esjiondingly truncate distally. 

 Cross veinlets variable in number and distribution in both A^dngs ; in small specimens 

 they are commonly placed as in PI. XIII. 22 a, not approaching the terminal margins 

 of the wings, and amounting to a very limited number in the hind wing ; in the ? fore 

 wing they are sometimes weU defined in the marginal area before the buUa, where in 

 small specimens they are usually obsolescent ; in large examples they are often nearly as 

 numerous in both wings as in Calliarcys (PI. XIV. 23), and then those forming branch- 

 lets to the longitudinal nervures at the terminal margin of the fore wing are somewhat 

 deficient in regularity, and are usually curved. The anal-axillar interspace of the fore 



