on the Lphemeride. 61 
Polymitarcys Savignii, n. sp. 
(Genitalia maris, Pl. III. fig. 16, 16 a.) 
(Ephemera, Say.1817; Palingenia Savignyt, Pict. 1843-5.) 
Imago ¢,v.s.s. Capitis vertex cinereus. Prothorax 
murinus, linea longitudinali in medio atra; meso- et 
meta-thoraces lutescentes. Ale albzx; antice costis et 
subcostis in majore parte nigricantibus. Pedum antici 
eriseo-tincti, posteriores cretacei. Abdomen cinerascens, 
juncturis, lateribus, ventreque sub-ochraceis, et setis albis. 
Nervi transversales apicales arez marginalis antice 
simplices et subrecti. 
Long. corp. 10, al. 11 mm. 
Hab.—The Nile. 
M. E. Pictet has several specimens of this species. 
Polynvitarcys indicus. 
Palingenia indica, Pict. 1843-5. 
Subimago 9,s.s. ‘* Caput parvum, nigricans. Pro- 
thorax brevis, gibbosus, et fulvus, in medio fuscus. 
Mesothorax fulvus, strigis longitudinalibus _ tribus, 
quarum duz alarum radices versus prodeunt. Area 
marginalis antica violaceo-tincta. Pedes antici fulvi, 
tibs strigisque in femoribus singulis nigricantibus. 
Setee parum ciliate, fulvee.” (Pict.) 
Long. corp. ? 12, exp. al. 30 mm. 
Hab.—The Hast Indies. 
Mr. M’Lachlan possesses specimens of two other 
species, undescribed, from N. W. India and Bombay. 
Polymitarcys macrops. 
Palingenia macrops, Hag. 1856. 
Apex are marginalis antic nervis reticulatis. 
Species in electro. 
Long. corp. ¢ subim. 11, exp. al. 23 mm. 
Genus PALINGENIA. 
Ephemera, p., Ol. 1791; Palingenia, p., Burm. 1839 ; 
restricted, Westw. 1840. 
Nympha fodiens. Segmentorum abdominis 2-7 bran- 
chiifera; laminée branchiales duplices, et bene fimbriate. 
