REV. A. E. EATON OX EECENT EPHE5IEEID.E OE MAYFLIES. 43 



as in Cloeon or Siphlurus ; the legs slender, trailed in the act of natation, whicli is 

 eflPected by the sette onl3^ Fore femur and tibia bearded behind with long stiff hairs, 

 which on the tibia are disposed in two rows longitudinally, and spread divergently ; the 

 tibial spur nearly as long as the tarsus, the shin or front of the tibia spiuulose; the 

 tarsus slender, bearded beneath. Prosternum at the joining of the head furnished on 

 each side with a tuft of fibrillose tracheal branchite. 



Distribution. South of France, the Garonne at Toulouse ; also N. America, at Niagara. 



Type. J. Boeselii (in Paliiir/ema), Joly MS. 



Etymology. Dr. E. Joly of Toulouse, who first discovered the animal, 



JOLIA RcESELii, Joly. Plate II. 9 ( d , wings [part], legs, forceps [subim. ?]). 



Palingenia tolosana, Joly, IMS. (1870). P. Rwselii, ! Joly, INIem. See. d. Sc. Nat. Cherbourg, xvi. 

 67, pi. i. 1 [excl. citations] (1872); idem, Bull. Soe. d'Etud. Sc. d' Augers, ann. 4-5'', p. 42, Note C 

 [cited as P. longicauda, var.] (1876); idem. Rev. Sc. Nat. MontpeUier, v. 309, 314, pi. vi. 3 (1876). 



Julia [type] Resell, Etu., Ent. Mo. Mag. xvii. 192 (1881). /. Rrsdii, ! Vayssiere, Ann. Sc. Nat. (6), 

 Zool. xiii. 59, figs. 69-73 [nymph details] (1882). 



Imago undescribed. — The 6 specimen given me by Dr. E. Joly, for the British Museum, 

 is in pieces preserved in alcohol. He considers it to be an imago ; but the condition of 

 the legs, forceps, and setae is so nearly identical with that of the corresponding parts in 

 subimagines of Campsuriis and Folymitarcys, that I am not yet convinced of its being 

 the adult fly. 



Nymxih- — Length of body about 11, setae 6 and 4 mm. 



Hah. The Garonne near Toulouse. The njmiph harbours under large stones in swift 

 parts of the river : I have obtained it just below the railway-bridge (pont d'Empalot) above 

 the town. The fly was reared by Dr. E. Joly on 1st September, 1868, who named the 

 nymph Palingenia tolosana in a paper read at a meeting of the Soc. d'Hist. Nat. de 

 Toulouse, on the 15th July, 1870, and who altered the name to P. Hosselii the next year 

 in another paper communicated to the Cherbourg society, cited above. In the plate 

 illustrative of this later paper Dr. Joly reproduced four figures from older authors, which 

 he tabulated as nymphs congeneric with Jolia, and in one instance identical with the 

 French nymph. These are respectively, fig. 2 (after Swammerdam), Palingenia longi- 

 cauda; fig. 3 (after Pteaumur), Cloeon rnfidum; fig. 4 (after Ptoesel), a Siphlurus; and 

 fig. 5 (after De Geer), a Siplihims. Of these figures, nos. 3-5 had never before been 

 supposed to represent any thing akin to Palingenia, and their citation as illustrative of 

 species near of kin to Jolia is not only misleading, but also very depreciatory of the 

 novelty of Dr. Joly's discovery. Reaumur's figure of the Cloeon and Rffisel's of the 

 Siphlurus are not quite accurate, so far as they go ; but their general effect is charac- 

 teristic, and the accompanying letter-press affords additional means of ascertaining what 

 were the subjects intended to be represented by them. De Geer's description is also 

 conclusive. 



FOLYMITARCYS, Etn. 1868. 



Illustrations. Adult (details), PI. VI. 10 a -c; (whole figures) see citations under 

 P. Virgo and the other species, especially Palingenia virgo, Pict., Hist. Nat. Nevropt. ii. 



6* 



