110 REV. A. E. EATON ON EECENT EPHEMEEID^ OR MAYFLIES. 



pobracliial nervure, and the nearest to the wing-roots of those posterior to it in the fore 

 wing, are slightly thickened ; the submarginal area of the same wing for a short space 

 beyond the bulla is somewhat deticieut in colour ; the said area contains about 4 cross 

 veinlets before the bulla, and 14 beyond it, which are mostly straight and simple, only 

 one or two of them forking near the costa. Length of body 7, wing 8, setse 17 mm. 



Hab. Chiriqui, Panama (M^Lach. Mus.). The neui'ation of the fore wing is of the 

 same type as that of the wings rej)resented in PI. XIII. 23*^' and 23*^. 



Theatjlus colomble. Walk. Plate XIII. 20*-^ (hind wing). 



X Ephemera colombicB, ! Walk., List of Neuropt. in Brit. Mus. part iii. 537 (1853). 



Palingenia colombice, Hag. MS., Smithson. Miscell. Coll. (1861), Synop. Neuropt. N. Am. 304 [list]. 



Leptophlebia Colombia, !Etn., Traus. Ent. Soc. London (1871), 84. 



AdenophleUa Colombia, ! Etn., Eut. Mo. Mag. xvii. 194 (1881). 



Subimago {dried), ? , — Thorax very light brown-ochreous above. Abdomen light rufo- 

 luteous above ; segments 1-8 bordered with black at the apical margin, segments 2-7 

 marked on each side with a broad black stripe descending obliquely from the distal 

 border. Setae intense warm sepia-brown, dark at the joinings and in the midst of the 

 joints. Fore femur lutescent reddish-brown, almost light clove-brown, the tibia pitch- 

 brown, the tarsus lighter or more lutescent than the tibia ; hinder legs dull, subluteous 

 or dark testaceous, the coxse and trochanters paler. Wings transparent light brown- 

 ochreous-grey ; in the fore wing, the longitudinal nervures, the cross veinlets in advance 

 of the radius, and most of those posterior to it in the proximal half of the disk of the 

 wing, are light brown-ochreous ; the cross veinlets posterior to the radius in the remain- 

 ing portion of the disk are black. In the marginal area of the fore wing are 1 or 2 very 

 faint cross veinlets before the bulla, and beyond it 18-19 oblique, curved, and near the 

 costa sparingly forked. Length of body, ? , 10, wing 15, setae 19 mm. 



Sab. United States of Colombia (Brit. Mus.). The length of the setse and habitat 

 were misstated by me in 1871. 



Thraultjs l^tus, sp. nov. Plate XIII. 23*^ (wing [part] genitalia and liinder foot). 



Calliarcys (provisional) leetus, ! Etn., in the writing of the plate quoted. 



Imago {dried), s . — Thorax rich brown-ochre above. Abdomen in segments 2-6 white, 

 with a series of small triangular spots on each side of the dorsum, and with the spiracles 

 black ; segments 7-10, above fusco-rufescent, the 8th narrowly edged in the midst of its 

 distal margin with light yellow ochre, the bordering enlarged abruptly on each side into 

 a triangular spot, whose point reaches the base of segment 7 ; segments 9 and 10 have 

 a small oblong yellow-ochreous spot on each side of the dorsum and a black dash 

 at the lateral border. Beneath, segments 7-10 are light yellow-ochreous, with theii* 

 lateral borders rufescent, the tips of the forceps also rufescent; ventral ganglia light 

 warm sepia brown. Pemora whitish, with a grey-black band before the middle and a very 

 broad conspicuous rufescent band near the tip : tibiaj and tarsi in some lights very pale 

 pitch-brown, in other lights very pale lutescent, the former grey-black at the tip, and the 



