EEV. A. E. EATON ON EECENT EPHEMEEID.E OR MAYFLIES. 289 



also noticeable in the pterostigmatic region of that wing, situated at about f of the 

 distance from the bullte towards the apex of the marginal area, between the costa and 

 the radius : in the hind wing the neuration appears whitish in some lights, in others the 

 cross-veinlets towards the extremity of the wing become greyish. 



2 {living). — Eyes brownish olive. Pronotum greenish olive ; mesonotum light olive- 

 brown ; metanotum blackish, varied with light and brownish ochre. Abdomen light 

 greenish olive, with a dark narrow median stripe along the back in segments 2-7, which 

 is dilated anteriorly in every segment, in addition to the other blackish markings de- 

 scribed in the 6 . Seta; intense sepia-brown at the base, becoming lighter with dark 

 joinings distally. In other respects very similar to the 6 . Length of body 10-1 i ; 

 wing, 6 10-12, 2 12-15 ; setiB S iui. 32-34, subim. 14-20, 2 im. 22-25, subim. 15 mm. 



Rab. England, in rapid parts of rivers, such as the Dart, the Kennet, and the Eden ; 

 May to August ; France, in the Garonne, close to St. Michel, Toulouse. 



EcDYUUUS FLUMiNUM, Pictet. Ni/mijli, Plate LXII. (part). 



^ Ephemera speciosa, Toia, lus. ]\Ius. Graic. 98 (17G1) ; Sclir., Enumer. Ins. Austr. indig. no. 604 

 (1781); Vill., C. Linn. Ent. iii. 22 (1789) ; 01., Encycl. Meth. vi. 418 (1791) ; Lat., Hist. Nat.d. Crust, 

 et Ins. xiii. 97 (1805).- — E. I bioculata, Panzer, in Explic. Sclitef. Ic. ccxxix. [excl. var,] (1804). — I E. 

 angustipennis, ! Ramb., Hist. Nat. des Ins. Nevropt. 295 (1842) ; Walk., List of Neuropt. Ins. in Brit. 

 Mus., part iii. 571 (1853) [nomen ineptum] . 



% Baetis fluminum, Pict., Hist. Nat. Nevropt. ii. Ephem. 164, pis. svi.-xix. (184.3-5) ; ImhofF, Insect, 

 d. Scliw. Bd. iv. [a pi. & fig., not numbered] (1845); Walk., List of Neuropt. Ins. in Brit. Mus. 

 part iii. 556 (1853) ; Brauer, Neuropt. Austr. 26 (1857) ; Karsch, Die Insectenwelt, v. 400-402 (1863) ; 

 Hag., Ann. Soc. Ent. Fr. (1864) 38; Meyer-Diir, Mitth. scliw. ent. Ges. i. 221 (1864); Ausser., Ann. 

 d. Soc. Natur. xModena, An. iv. 134 (1869).— B. angustipennis, Ed. Pict., Nevropt. d'Espagne 23 (1865). 

 — ?B speciosus, Etn., Trans. Ent. Soc. Loudon (1871) 120 note; id., op. cit. (1873) 402. 



Heptagtnia fluminum, Etn., Trans. Ent. Soc. London (1871) 146; Meycr-DUr, Mitth. schw. ent. Ges. 

 iv. 315 (1874); Rostock, Jahresb. d. Ver. f. Naturk. Zwickau, 1877, p. 91 (1878) ; Palmeu, Paar. Ausf.- 

 Gange d. Geschl.-Org. b. Insect. SS. 40, 60, 63, 65, 74 and 77, taf. iii. 38, and taf. iv. 56 (1884) 

 [auatom.]. — H. angiistijjennis, ! Etn., Trans. Ent. Soc. London (1871) 152. 



Sublmciffo {dried). — Wings fawn-colour or liglit brownish grey, approaching vandyke- 

 and Cologne-earth ; neuration for the most part pitch-black, but some of the thicker 

 nervures are yellowish ; cross-veinlets black, narrowly edged with grey, rather paler 

 towards the costa. Setae either light yellowish, or else dark sepia-brown with dark join- 

 ings ; in living specimens they are blackish grey or dusky. Pictet's tigure Avell represents 

 the wings of the living insect ; after death the dark bands and stripes across the fore 

 wing disappear. These markings are as follows : — a transverse cloud in the basal portion 

 of the disk, followed by a transverse abbreviated streak from the anal angle, and another 

 a little further on from the costa in the neighbourhood of the bullte, and lastly, between 

 this and the tip of the fore wing, three narrow transverse streaks from the pterostigmatic 

 region. {Living.) — Eyes of ? greenish, surrounded with pitch-brown, and exhibiting a 

 movable black dot. Wings fawn-colour or smoky grey with black, grey -margined cross- 

 veinlets, rather paler towards the costa. Body more or less greenish ochraceous ; the 

 abdominal segments very narrowly darker at the tips ; segments 1-S striped obliquely 



' SECOND SERIES. — ZOOLOGY, VOL. IH. 39 



