EEV. A. E. EATON OX RECENT EPHEMERIDiE OR MAYFLIES. 151 



Limulm peymigerus, Miill., Eatom. p. 127, no. 62 (1800?) [cited by Lat. 1802]. 



Prosopistoma punctifrons, Lat., Nouv. Ann. du Mus. (3), ii. 33 (1833) ; id., op. cit., iii. 40 (1843); 

 Lucas, Diet. Univ. Hist. Nat. d'Orbigny, ed. ii., art. Prosopistoma (18G9); Joly, Rev. d. Soc. Savants 

 (2), V. 4-6 (1870) ?; id., Mem. Soc. Nation. Sc. Nat. Cherbourg, %\\. 329-336 (1871) ; MuL, Ent. Mo. 

 Mag. viii. 227 (Feb. 1872) ; id., Zoologist, 2955 (1 Feb. 1872) ; id., Proc. Ent. Soc. London, 1st Jan. 

 1872, p. xlvi. (19 Feb. 1872) ; Wcstw., Athena;um (Feb. 24th, 1872) ; N. Joly, Mem. de FAcad. 

 des Sc. Inscript. et Belles-let. de Toulouse (7), vol. iv. Bulletin, pp. 437—138 (1872) ; id., op. cit. pp. 440- 

 441 (Mars, 1872) ; id., in Le Progres Lib. de Toulouse (19 Mars, 1872); Westw. & IV^Lach., Ent. 

 Mo. Mag. viii. 279 (1 April, 1872) ; iidem, Proc. Ent. Soc. London, 19 Feb., p. vi. (April 1872) ; E. & 

 N. Joly, Ann. d. Sc. Nat. (5), Zool. xvi. Art. no. 7, pp. 16, pi. xiii. 1-16 (Sept. 1872); M^Lach., Ent. 

 Mo. Mag. X. 109 (Oct. 1873) ; id., Rep. Brit. An. for 1873, p. 118 (1874) ; id., Journ. Linn. Soc, 

 Zool. xii. 145 (1874) ; Joly (' Separate' of). Rev. des Soc. Sav. (2), iii. 69-72, p. 7, Note E (Digue 

 Dec. 1874) ; N. &. E. Joly, in Le Prog. Lib. de Toulouse (17 Mars, 1875) ; iidem, Mem. de FAcad. des 

 Sc. Inscript. & Belles-let. de Toulouse (7), via. 606-607 (1875) ; Joly, Feuil. d. Jeun. Nat. v. 68 

 (1875); id., op. cit. vi. 53-54, pi. ii. 1-5 (Mars 1876); id., Bull. Soc. d'Etudes &c. d' Augers, 1874-5, 

 pp. 44-45, Notes E & G (1876) ; N. & E. Joly, Rev. des Sc. Nat., Montpellier, v. 307 &c., pi. viii. 32 

 [tracheal branchise] (Dec. 1876) ; Westw. Trans. Ent. Soc. London (1877), 189-194, pis. iv. B 1-5 & v. 

 1-12 [after Joly] ; Joly, Ann. Soc. Ent. Fr. (5), viii., Bull., pp. 70-71 (Avril 1878); id., Feuil. d. Jeun. 

 Nat. no. 92, pp. 99-100 (Juiu 1878) ; Joly & Vays., Compt. Rend, des Seauc. de I'Acad. des Sc. Paris, 

 Ixxxvii. 263-5 (Aout 1878) ; Joly, Pet. Nouv. Ent. ii. no. ccv. 265 (Oct. 1878) ; id., Feuil. d. Jeun. 

 Nat. no. 98, pp. 24-25 (Dec. 1878); Joly & Vays., Bull. Soc. d'Etud. Sc. Nat. Nimes, no. vi.-vii. 

 (1878) ; Joly, op. cit. (1879), pp. 3-7 ; id., Proc. Ent. Soc. Fr. (1880), Bull. no. xi. 109 ; id.. Bull. Soc. 

 d'Etud. Sc. d' Angers, 1878-9, pp. 157 note 2, 158 note 1, 164 notes, 167 Note B (1880) ; Vays. Anu. 

 des Sc. Nat. (6), Zool., xi. 1-15, pi. i. 3-17 (1881) [nymph, subim., & details] ; id., op. cit. xiii. 77, pis. 

 vi. 57, X. 105-109, si. lOi & 110-114 [nymph and details] & 116 [diseased nymph] (1882).— P./o/(«- 

 ceum, Lucas, Ann. Soc. Ent. Fr. (6),ii., Bull. Eut. xcv. (Sept. 1882). 



Chelysentomon or Ch. pennigerum, N. & E. Joly, in Le Prog. Lib. de Toulouse (Fev. 1872) ; iidem, 

 Mem. de I'Acad. des Sc. Inscript. & Belles-let. de Toulouse (7), iv., Bull., pp. 437-438 (Fev. 1872) ; 

 N. Joly, in Le Prog. &c. (19 Mars, 1872) ; id., Mem. de I'Acad. &c. (7), iv., Bull., 440-441 (1872) ; 

 N. & E. Joly, Mem. de I'Acad. &c. (7), iv., pi. figs. A-G & R (1872) ; id. Compt. Rend. Paris, Ixxiv. 

 1413 (1872). 



2 Suhimago {in alcohol). — Wings dark iron-grey, especially the anterior. Body 

 reddish brown, darker above than beneath, and pale at the insertions of the legs. Length 

 of body 3-78, wing 4-85, setee 0-42 millim. (Vayssierc). 



Sab. France ; the Garonne near Toulouse, chiefly to the right of ile des Grands- 

 Eamiers, not far from the powder-mills below the Pont d'Empalot (Joly) ; the Ehone 

 at Avignon (Vayssiere) ; the Seine above Paris (Geoif.), in the neighbom-hood of Epone, 

 Mantes, Bas-Meudon, and Point-du-Jour (Lucas). Germany : the Rhine at St. Goar, 

 between Coblentz and Mayence (Dr. Noll, teste Prof. Leydig). Bohemia, in the Moldau, 

 a tributary of the Elbe (Purkinje, teste Blanchard & Joly). The nymph inhabits swiftly 

 flowing water from a few inches to 6 ft. deep, harbouring in irregularities of the vmder 

 sui-face of rough stones, and shunning the light. It swims with agility, propelled solely 

 by the caudal seise, holding its legs closely folded up under the body. When desirous of 

 repose, it is able to attach itself by adhesion, like a Patella, to a smooth surface ; the 

 joinings of the segments and of the head and thorax are then tightly contracted, to 



