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



occurrence ; and M. Vayssiere is not the first nor the second entomologist who has been 

 misled by it. 



The nymph of Baetis has probably been reared by others besides myself. I have 

 identified and examined those of B. vernus, B. rhodani, B. gemellus, B. melanonyx, and 

 B. 2onrnilus, in addition to many undetermined species. 



The species of this genus being numerous are arranged geographically in the following 

 order : — European, North American, Central American, South American, and Cingalese. 

 The figures of wings and forceps of European species published in 1871 w'ere engraved 

 after a photograpli on reduced scale of my original drawings ; but the engraving was not 

 faithfully executed in facsimile, and consequently the value of the figures was impaired. 

 I therefore deem it advisable to reissue some of them, on the scale of the original 

 drawings. 



EUROPEAN SPECIES. 



Baetis binoculatus, Linn. Plate XVI. 29 b (wings and forceps). 



[Ephemera] or E. bioculata, Linn., [Act. UpsaL (1736) 27, no. 2; id., Fn. Suec. ed. i. no. 751 (1746)]; 



id., Syst. Nat. ed. x. i. 547 (1758); id., Fn. Suec. ed.ii. no. 1473 (1761); [Geof., Hist. Abr. d. Ins 



Paris, ii. 239, no. 5, pi. xiii. 4 (1764)]; Mul., Fn. Ins. Fried, no. 556 (1764) ; Linn., Syst. Nat. ed. xii. 



pars ii. 906 (1767) ; Fab., Syst. Ent. 304 (1775) ; id., Sp. Ins. i. 384 (1782) ; Str6m. N. Saml. Kongl. 



Dansk. Vidensk. Selsk. Skrift. ii. 91 (1783) ; Fab., Mant. Ins. i. 244 (1787) ; Vill., C. Linn. Ent. iii. 



18 (1789) ; [Zsch., Mus. Lesk. i. 150, no. 16 (1789)] ; Gmel., Linn. Syst. Nat. ed. xiii. i. pars v. 2629 



(1790); Ol., Encyc. Meth. vi. 419 (1791); Fab., Ent. Syst. emend, iii. pars i. 70 (1793) ; Schr., Fn. Boica, 



ii. pars ii. 199 (1798) ; Cederh., Fn. Ingricte Prodr. 134 (1798) ; Walck., Fn. Paris, ii. 9 (1802) ; Lat, 



Hist. Nat. Crust. & Ins. xiii. 97 (1805) ; Shaw, Gen. Zool. vii. partii. pi. Ixxxi. (1806) ; Lamarck, Hist. 



Nat. d. Anim. s. Vertebr. ed. i. iv. 221 (1817) ; Stewart, Elem. Nat. Hist, of Anim. Kingd. ed. ii. ii. 



225 (1817) ; Guer., Iconograph. Regn. Anim. ii. pars i. pi. Is. 9 (1829-43) ; Gray, Griffith's Anim. 



Kingd. ii. pi. xciv. 9 [after Guerin] (1832) ; Zet., Ins. Lapp. col. 1046 (1840) ; Westw., Introd 



Classif. of Ins. ii. 25 (1840); Blanch., Hist. Nat. d. Ins. iii. 54 (1840) ; Wallengren, Christ. Vidensk. 



Forhandl. no. ii. 21 {\SSO).—E.fuscata, Linn., Fn. Suec. ed. ii. no. 1474 (1761) ; Miil., Fn. Ins. Fried. 



63 (1764) ; Linn., Syst. Nat. ed. xii. pars ii. 907 (1767) ; Vill., C. Linn. Ent. iii. 19 (1789) ; Gmel., 



Linn. Syst. Nat. ed. xiii. i. pars v. 2629 (1790); 01., Encyc. Meth. vi. 419 (1791) ; Fab., Ent. Syst. 



emend, iii. pars i. 70 (1793) ; Walck., Fn. Paris, ii. 9 (1802) ; Lat., Hist. Nat. Crust. & Ins. xiii. Q7 

 (1805). — E. diaphana, Mill., Zool. Dan. Prodr. 143 (1776). — E. flava, Schr., Beytr. z. Naturgesch. 



82 (1776) ; id., En. Ins. Austr. indig. no. 605 (1781, ; Vill., C. Linn. Ent. iii. 22 (1789) ; 01., Encyc. 

 Meth. vi. 421 (1791J; Schr., Fn. Boica, ii. pars ii. 199 [179S).—E.% lutea, Fourc, Ent. Par. ii. 353 

 (1785).— £. notata, Gmel., Linn. Syst. Nat. ed. xiii. i. pars v. 2630 (1790) ; 01., Encyc. Meth. vi. 

 422 (1791). — E. X cuUciformis, id., op. cit. vi. 420, note [e.xcl. descript.] (1791) ; Lat., Hist. Nat. d. 

 Crust. & Ins. xiii. 98? (1805).— £. | striata, Walck., Fn. Paris, ii. 10? (1802). 



Baetis bioculatus. Leach, Brewst. Edinb. Encycl. ix. 137 (1815) ; Sam., Ent. Comp. 259 [B. bioculata] 

 (1819) ; id., Ent. Cab. ii. no. 53, pi. xxiv. 1 (1834) ; Steph., 111. Brit. Ent. vi. 65 (1835) ; ! Etn., Ent. 

 Mo. Mag. V. 88 (1868).— 5. binoculatus, !Etn., Trans. Ent. Soc. Lond. (1871) 111, pls.ii. 9 & v. 16, 16a 

 [details] ; Hag. & Etn., op. cit. (1873) 401 ; Meyer-Diir, Bull. Soc. Ent. Suisse, iv. 309 (1874) ; Palme'n, 

 z. Morphol. d. Tracheensyst., Sect. i. pi. i. 1-7 (1877) ; Rostock, Jahresb. d. Ver. f. Naturk. Zwickau, 

 1877, p. 86 (1878) ; ! Etn., Ent. Mo. Mag. xvii. 196 (1881) ; Palraen, Paar. Ausf. gauge d. Geschl. org. 

 b. Insect. S. 71 [anatom.] {188-1).— B.flavescens, Curt., Lond. & Edinb. Phil. Mag. ser. 3 (1834) 131; 



