REV. A. E. EATON 'ON RECENT EPHEMERID^ OR MAYFLIES. Ill 



latter narrowly edged with grey-black at the joinings. "Wings vitreous, their nervnres 

 in opaque view testaceous, changing in transmitted light to yellowish amber-colour, their 

 membrane slightly fuscescent by the wing-roots and great cross vein ; the marginal area 

 of the fore wing contains about 9 simple curved cross veinlets, exclusively in the 

 pterostigmatic region. Length of body 6, wing 8 mm. 

 Hab. New Granada (M°Lach. Mus.). 



ADENOPHLEBIA, Etu., 1881. 



Illustrations. — Adult (details), Plate XIII. 21. 



Adult. — Hind wing obtusely and very strongly angulated in front ; tlie angle placed 

 at about the first \ of the wing's length, and followed by a wide sinus ; the sinus, 

 extended as far as the extremity of the radius (3) and close to the tip of the wing, is 

 nearly straight-edged from the angle to the termination of the sul)costa (2), where it 

 attains its greatest depth, and from thence to the end of the radius its margin is very 

 gently convex; marginal area obtusely subtriangular, with the angle at the extremity of the 

 subcosta very acute ; submarginal area much narrower than the preceding, elongated, 

 irregularly quadrangular, acuminate at both ends, and with the hinder of the obtuse 

 angles situated nearly midway between the wing-roots and the tip of the wing; the 

 lines containing this angle [viz. the radius, and the common trunk of the radius and 

 cubitus (5)] are gently arched ; the marginal area contains 2-4 cross veiulets, the sub- 

 marginal a few more ; the nearest of those to the wing-roots is in immediate proximity 

 to the saHent angle of the front margin. Cross veinlets plentiful in the fore Aving, 

 excepting towards the inner margin ; most of the nervures at the terminal margin have 

 curved simple branchlets. The arrangements of the intercalar nervures of the anal 

 axillar interspace of the fore wing cannot be described fully through lack of an adequate 

 series of specimens ; in the wing figured they are 4 in number, and (counting from front 

 to rear) 1 and 3 are long, 2 and 3 annex themselves to 1, and this to the anal, 4 is 

 isolated and short ; sometimes 1 and 3 project abruptly a little in front of the cross 

 veinlets adjacent to their terminations, while 4 is much abbreviated ; cross venilets 

 continue to be plentiful as far as the first intercalary nervure, and then become scarce. 

 Probably other combinations occur similar in general plan to those displayed in 

 figs. 23*- and 23*- of the same plate. Orifice of the mesothoracic spiracle furnished with 

 a small oval guard. Porceps-limbs 2-jointed in the type ; the proximal joint compressed, 

 many times longer than the other, and in its basal half broadly dilated. Eorceps-basis 

 short and entire ; the homologous ventral lobe of ? obtuse and entire. Median caudal seta 

 subequal to the others ; those in 6 about twice as long as the body. Tarsal ungues 

 uniformly narrow and hooked ; fore tarsus of i scarcely longer than the tibia, which is 

 little longer than the femur ; its joints in diminishing sequence rank 2, 3, 4, 5, and 1. 

 Intermediate leg little more than half as long as the hind leg. Hind tarsus (excluding 

 joint 1) about ^ as long as the tibia and joint 1 together ; its joints rank 2, 3 subequal to 

 5, 4 ; joint 1 is ill defined. Nymph unknown. 



Type. A. dislocans (in Ephemera), AValker. 



10* 



