268 EEV. A. E. EATON ON EECENT EPHEMEKID.E OK MAYFLIES. 



EUROPEAN AND ASIATIC SPECIES. 



In Herr Rostock's analysis of the Saxon species of Jleptayenia, some of the 

 characteristics relied upon are in some degree variable with the individual specimen 

 {e. g. the coloration or tlie partial deficiency in colour of the marginal area of the 

 fore wing). 



Heptagenia sulphueba, Miiller. Plate XXIV. 45 (legs). 



Ephemera sulphirea, Miill., Zool. Dan. Prodr. 142 {\77€>). — E. hehola, Stihz., Abgek. Gesch. d. Ins. 

 171, pi. xxiv. 7 (1776). — E. leucophthalma, StriJm, N. Saml. Kougl. Dausk. Vidcnsk. Selsk. Skrift. ii. 

 90 (1783) ; Wallengrcn, Christ. Videtisk. Forhandl. No. ii. 21 (1880).— JS. \bioculata, Romer, Gen. Ins. 

 Lin. & Fahr. icon, illust. 23, pi. xxiv. 7 [after Subz.] (1789). — [Ephemera] or E. ferruginea [Zsch. 

 Mns. Lesk. i. 150. no. 18 (1789)]; Gmcl., Linn. Syst. Nat. ed. xiii. i. pars v. 2630 (1790); 01., Encycl. 

 Meth. vi. 422 (1791). — E.\bioculata, var.. Panzer, in Explic. Scliief. Ic. ccxxix. (1804); id., Fn. Ins. 

 Germ. init. Heft xciv. no. 17 (1805). — E. citrina, Humrael, Essais Entom. no. iv. 71 (1825). — E. \lutea, 

 IStepli., 111. Brit. Eut. vi. 55 (1835). 



Bactis e/ei/aiis, Curt., Lond. & Edinb. Philos. Mag. ser. 3 (1834) 120; ! Steph., 111. Brit. Ent. vi. 64 

 (1835) ; Pict., Hist. Nat. Nevropt. ii. Epliem. 193 (1843-5); Walk., List of Neuropt. in Brit. Mas. 

 part iii. 560 (1853) ; Hag., Ent. Ann. (1863) 25.— jS. costaUs, Curt., Lend. & Ediub. Phil. Mag. ser. 3 

 (1831) 120; ! Steph., 111. Brit. Ent. vi. 64 (1835) ; Pict. Hist. Nat. Nevropt. ii. Ephe'm. 194 (1843-5) ; 

 Walk., List of Neuropt. in Brit. Mus. part iii. 561 (1853). — B. straminea, Curt., Lond. & Edinb. Philos. 

 Mag. ser. 3 (1831) 121.— ? 5. marf/inalis, Burm., Handb. d. Ent. ]5d. ii. Abth. ii. 801 [excl. citations] 

 (1839).—^. ci/anojjs, Pict., Hist. Nat. Nevropt. ii. Ephein. 171, pi. xx. 2 (1843-5); Walk., List of 

 Neuropt. Ins. in Brit. Mus. part iii. 556 (1853). — B. sulphurea, Pict., Hist. Nat. Nevropt. ii. Ephem. 

 185, pi. xxiii. 8 (1843-5) ; Walk., List of Neuropt. Ins. in Brit. Mus. part iii. 558 (1853) ; Brau.,Neur. 

 Austr. 74 bis (1857) ; Ausser., Ann. d. Soc.'Natur. Modcna, An. iv. 134 (1869) ; Joly, Rev. d. Sc. Nat. 

 Montpellier, v. 323, pis. viii., ix. figs. 36-38 bis & 51, 52 [anatomical details] (1876). — B. % lutea, Hag., 

 Ent. Ann. (1863) 23. 



Heptagenia elegans, !Etn., Trans. Ent. Soc. London (1871) 145, pi. iii. 5 [wing] & vi. 18-18 b [details]; 

 Hag., op. cit. (1873) 404 ; Meycr-Diir, Bull. Soc. Ent. Suisse, iv. 312 (1874) ; Rostock, Jahresb. d. Ver. 

 f. Naturk. Zwickau, 1877, p. 90 (1878) ; Pahncn, Paar. Ausf.-Gauge d. geschl. Org. b. Insect. S. 44, 

 64, 65, 74, 75, 77, 78, 83, 92, taf. ii. 28, 29, iii. 39-41, & iv. 58 [anatom.] (1884). 



Suhimago (living). — Eyes pale blue-verditer, or else pale yellow-green with a movable 

 round sjoot surrounded by about half a dozen little circular specks of less intense grey ; 

 orbits of ocelli olivaceous ; a small triangular black speck on each side of the face at the 

 lower part of the inner orbit, and sometimes a rhomboid black spot close to the eyes on 

 the vertex ; a linear dash on the pleura just behind the fore coxa, and from 1 to 3 dots, 

 also black, near and above the intermediate coxa. On each side of the mesonotum is a 

 pitch-brown streak tapering forwards from the hinder part of the segment and angu- 

 lated close to the Aviug-roots. Wings at first unicolorous sulphur-, or lemon-yellow; the 

 membrane afterwards becomes dull greenish yelloAV, or even yellow- green (like fumes of 

 chlorine) ; a tapering grey streak is developed transversely from near the inner-terminal 

 angle of the fore wing, and another nearer the tip of the wing from the vicinage of the 

 pterostigmatic space, while simultaneously a grey band of moderate breadth appears 

 along the terminal margin and the cross veinlets together with a dot at the bulla turn 



