288 EEV. A. E. EATON ON EECENT EPHEMEEID.E OE MAYFLIES. 



Hah. Sicily. Somewhat similar in colour to S. montana, according to Hagen. The 

 lacteous tint of the wing-membrane might be clue to camphor. The type was examined 

 bv me in 1869 ; but I have uo recollection of the insect. 



EcDTUBTJS iNsiGNis, Etn. Plate XSIV. 46 d (penis). 



Ephemera, ! Ronalds, Fly-fisher's Ent. ed. 1, pi. xi. 2.2 (1836). 



Hcptaffcmia insiffnis, \ Etn., Trans. Ent. Soc. London (1870) 7; Mil., op. cit. (1871) 153, pi. vi. 26, 

 266 [detail] ; Palmen, Paar. Ausf.-Giinge d. geschl.-Org. b. Insect. S. 74, 77, 78 [anatom.] (188-t). 



SuhlnuKjo {living). — Wings liglit sepia-grey, the cross-veinlets narrowly edged with 

 darker grey ; longitudinal nervures subolivaceous or dark greenish grey in the greater 

 portion of the wing, the wing-roots, and sometimes the adjoining parts of the said nervures, 

 light olive-green or greenish yellow ; cross-veinlets black. Settc and hinder tarsi black. 



Imago {living), 6 . — Eyes either dark olive-green intersected by an olive-brown line and 

 exhibiting a large dark round movable spot, or else greenish black or black, their pre- 

 dominant colour changing with age or the time of day. Notum in front either very dark 

 bottle-green or bistre-brown, posteriorly black varied with yellowish brown, or with 

 brown-ochre or dull orange ; teguloe light greenish yellow. Abdomen whitish green, 

 [the " green " approaching green oxide of chromium] modified in segments 8 and 9 with 

 brown-ochre above, with yellow-ochre in segment 10, and marked with black in segments 

 1-8 above and beneath ; the dorsal markings in each of these segments are an oblique 

 streak descending from the hind margin to the pleuron, in close proximity to the anterior 

 lateral angle of the dorsum on each side, tapering downwards and narrowly cuneiform, 

 and these two streaks are connected together by a very narrow black edging along the 

 interjacent portion of the terminal margin of the segment ; in $ the tract of the dorsal 

 vessel is likewise blackish : the ventral markings in segments 1-7 comprise, severally, a 

 short acute longitudinal streak <3 (or triangular spot ? ) from the base in the middle, a 

 pair of short isolated lines parallel with the dorsal streaks of the same segment, com- 

 mencing at a short distance from the median streak a little before its point, and divergent 

 from each otlier backwards, a pair of dots placed transversely adjacent to the ganglionic 

 tract, a little to the rear of the ends of the divergent lines, and, lastly, a fine line on 

 each side closely skirting the pleuron, terminating some distance from the tip of the 

 segment, and interrupted a little before the middle ; in segments 8 and 9, the ohve- 

 green ground-colour is suffused more or less with reddish brown in 6 , and is varied in 

 2 with pitch-brown. Seta; pitch-brown at the base, passing into intense sepia-brown and 

 distally into warm sepia. Eore femur and tibia pitch-brown, the tarsus rather lighter in 

 some positions ; in immature specimens the femur is dark olive- brown approaching bistre, 

 and is blackish at the knee ; hinder femora light olive-green modified with bistre, the 

 latter colour predominating at the knee and along the upper and lower edges ; tibiae 

 paler than the femora ; tarsi blackish or ivory-black. Wings vitreous ; in the fore wing 

 the longitudinal neuration and sometimes most of the cross-veinlets in the pterostigmatic 

 space are dull olivaceous (excepting the bases of the nervures posterior to the subcosta, 

 which are whitish), and the remaining, cross-veinlets are black; a small blackish cloud is 



