EEV. A. E. EATON ON EECENT EPHEMERID^ OR MATELIES. 93 



distally ; paraglossae obtuse, broadly dilated. Body slender, tapering evenly backwards 

 in a small degree. Hind leg the longest ; tbe tarsus almost as long as the tibia (exclu- 

 ding the claw). 



Type. L. marginata (in Ephemera), Linn. 



Distribution. Northern temperate regions ; also (undescribed sp.) Chili. 



Etymology. AeTrroV and <pAe/3ioi', from the tenuity of the cross veinlets. 



I have seen nymphs of L. suhnarginata, cincta, and an undetermined Portuo-uese 

 species alive, and some of an American (Portland, Or.) species forwarded by Dr. Hagen 

 in spirits. 



Lbptophlebia margin ATA, Linn. PI. XI. 17 a (wings, legs, and forceps). 



Ephemera marginata, Linu., Syst. Nat. ed. xii. pars ii. 906 (1767) ; Fab., Syst. Ent. 303 (1775) ; id., 

 Sp. Ins. i. 384 (1782) ; id., Maut. Ins. i. 243 (1787) ; Vill., C. Linn. Ent. iii. 17 (1789) ; Gmel., Linn. 

 Syst. Nat. ed. xiii. i. pars v. 2628 (1790) ; 01., Encycl. Method, vi. 417 (1791) ; Fab., Ent. Syst. emend. 

 iii. pars i. 69 (1793); Schr., Fn. Boiea, ii. pars ii. 198 (1798); Ced., Fn. Ingricte Prodr. 134 (1798) ; 

 Walck., Fn. Par. ii. 8 (1802) ; Lat., Hist. Nat. d. Crust. & Ins. xiii. 95 (1805) ; Shaw, Gen. Zool. vi. 

 part ii. pi. Ixxxi. (1806) ; Stewart, Elem. Nat. Hist. Anim. K. ed. ii. ii. 225, pi. xvii. 14, 15 (1817) ; 

 ! Steph., 111. Brit. Ent. vi. 57 (1835) ; Zet., Ins. Lap. col. 1044 (1840) ; Blanch., Hist. Nat. d. Ins. iii. 

 54(1840). — E.viridescens, Fourcroy, Ent. Par. ii. 351 {l785).—E.procellaria, Schwarz, Nomencl. 

 Roes. Ins. Belust. pi. xii. 1-3 (1793-1830).— £. \\stigma, ! Steph., 111. Brit. Ent. vi. 56 (18.35).— 

 E. talcosa, ! Steph., op. cit. vi. 57 (1835). 



Potamanttius stigma, Pict., Hist. Nat. Nevropt. ii. Ephem. 235 (1843-5) ; Walk., List Neuropt. 

 Brit. Mus. part iii. 541 (1853).— P. talcosus, Pict., op. cit. 234 (1843-5) ; Walk., op. cit. 541 (1853).— 

 P. marginatus, Hag., Ent. Ann. (1863), 17; id., Stet. ent. Zeit. xxvi. 229 (1864) ; Packard, Guide to 

 Study of Ins. ed. i. 595, fig. 577 (1870). 



Leptoplilebia marginata, Etn., Trans. Ent. Soc. Lond. (1871), 84, pis. ii. 2 a (wing) & iv. 25, 25 a-b 

 [details]; Hag., op. di. (1873), 395 ; Meyer-Dur, Bull. Soc. Ent. Suisse, iv. 317(1874); Rostock, 

 Jahresb. d. Ver. f. Naturk. Zwickau, 1877, p. 84 (1878). 



Subimago {living). — Wings either sepia-brown- or grey-black-tinted, the hinder pair 

 either in part (towards the base) or altogether paler ; cross veinlets in the fore wing 

 and towards the terminal border of the hind wing narrowly edged with black-grey ; 

 neuration translucent yellowish. 



Imago {living), 6 . — Eyes intense sepia-brown, or brown-black. Notum of thorax at 

 first pitch-brown, changing to jet-black. Abdomen pitch-brown, with the first 4-5 dorsal 

 joinings usually pale and translucent, the others flavescent or lutescent, and with the 

 last two or three ventral segments as well as the ventral ganglia pitch-brown, the former 

 with paler joinings ; but sometimes the pale dorsal segments are cinereous, with dark 

 spiracular lines and with luteous ventral ganglia. Pore legs pitch-black with cinereous 

 or greyish tarsi ; hinder legs dark pitch-brown, the tibiae and tarsi paler and often of a 

 pale reddish sepia-brown. Wings pellucid, with pale pitch-brown neuration, the fore 

 wings sometimes brown-tinted in the vicinage of the pterostigmatic space. Setae black 

 or greyish, with the joinings very narrowly opaque. Porceps paler than the 9th segment. 

 The reclinate appendages beneath the lobes of the penis are closely appressed to the 

 lobes, and are obliquely truncate at the points. 



SECOND SERIES. — ZOOLOGY, VOL. III. 13 



