116 EEV. A. E. EATON ON EECENT EPHEMERID^ OR MAYFLIES. 



(1881), p. 195. I have seen living nymphs of H.fusca and lauta, besides other species 

 in Portugal and Italy. 



Owing to the colours being transparent, those of the legs, wing-nervures, &c., are 

 liable to vary greatly with the direction in which they are viewed ; and as the species of 

 this geniis are in a large measure distinguishable from each other by slight differences 

 in the colouring of these parts, it is well to state what is the position of the specimen 

 when such and such colours appear. The following terms are employed for this pur- 

 pose : — opaque view, when the examiner standing back to light holds the specimen 

 directly away from the light ; oblique view or reflection, when the object held towards a 

 dark back-ground is examined under an oblique light, the examiner either facing the 

 light with the specimen below the eye, or standing sideways to the light with the object 

 nearly on a level with the eye; in transmitted lUjht the insect is interposed between the 

 eye and the window. 



Habbophlebia fusca, Curtis. Plate XIII. 22 a (wings, c? legs, forceps, and penis). 



Ephemera fusca, Curt., Lond. & Edinb. Phil. Mag. ser. 3 (1831), 120.— £. minor, ! Steph., 111. Brit. 

 Ent. vi. 60 (1835). 



X Ba'etis cingulata, ! Steph., op. cit. vi. 67 (1835). 



Potamanthus brunneus, Pict., Hist. Nat. Nevropt. ii. Eph{:;m. 217, pi. xxvii. (1843-5); Walk., List of 

 Neuropt. Ins. in Brit. Mus. part iii. 512 (1853).— P.>scms, Pict., Hist. &c. 235 (1843-5) ; Walk., List 

 &c. 543 (1853) ; Hag., Ent. Ann. (1863), 19.— P. minor, Pict., Hist. &c. 237 (1843-5) ; Walk., List &e. 

 546 (1853). 



CM cingulata, Pict., Hist. &c. 271 (1843-5). 



Cloeon cingidata, Walk., List &c. 578 (1853). 



Leptophh'bia fusca, ! Etn., Ent. Mo. Mag. v. 87 (1868); id., Trans. Ent. Soc. London (1871), 90, 

 pis. ii. 2 c, V. 2-2 6 [details] ; Meyer-Diir, Bull. Soc. Ent. Suisse, iv. 318 (1874) ; ! Vayssiere, Ann. des 

 Sc. Nat. (6), Zool. xiii., pi. i. 1, 2 (1882). 



Habrophlebia [type] /wsca, ! Etn., Ent. Mo. Mag. xvii. 196 (1881) [citation]. 



Subimago {living). — Wings light blackish grey, the nervures, at first opaque whitish, 

 becoming tinged with pitch-brown. Thorax pitch-brown, with pale sutures. Fore 

 femur dull pitch-brown or pitch-black ; tibia and tarsus in opaque view blackish grey, 

 changing in some lights to warm sepia-grey. Hinder femora dull light greenish Vandyke- 

 grey or greenish sepia-grey, tibise light sepia-grey, tarsi light blackish grey. Setge light 

 warm sepia-gi'ey, the joinings slightly opaque. Upper portion of eyes dull reddish- 

 brown, polished ; lower part intense sepia-black. 



Imago [living). — 6 . Upper portion of oculi intense burnt-umber brown, the lower 

 blackish. Thorax jet-black or pitch-black above, with light reddish-brown tegulse. 

 Abdomen pitch-brown, growing darker with age; segments 2-7 translucent, excepting 

 at the joinings, and narrowly whitish at the base ; the remaining segments opaque, the 

 extreme distal edges of 7-9 often orange or light yellow above ; venter dark sepia-grey 

 or blackish grey, often modified to some extent in segments 8 and 9 with dull orange. 

 Seta3 light sepia-grey, Avith light brownish joinings. Last two joints of the forceps-limbs 

 liwht sepia-grey ; penis during life somewhat Y-shaj)ed, with slender recumbent spurs 

 beneath the lobes. Fore femur and both ends of the tibia pitch-black, the intermediate 



