on the Ephemeride. 119 
spe linea longitudinali in medio, strigisque curvatis 
duabus ad bases segmentorum singulorum intermedio- 
rum, ochraceis; subtus serie notularum L-formatarum 
hepaticoloratarum utrinque. Sete vix cervine. Oculi 
olivacei. 
Long. corp. 3 @ 5-7; al. g 4-6, 9 6-8; set. ¢ 11- 
13, subim. 10; set. @ 7°5-10, subim. 10 mm. 
Hab.—Wales, England, Belgium, Germany, Austria, 
Switzerland and Corsica. It frequents rivers, from May 
to October. 
Baetis niger. 
(Forceps et ala postica, Pl. V. fig. 26, 26a.) 
Ephemera nigra, Lin. 1761. Cloe diptera, Ronalds, 
1856. B. wiger, Ktn. 1870. 
Subimago, v.v.s. Ale atrescentes. Pedes ¢ pallide 
fumati; ? femoribus prasinis, strigis singulis brevibus 
obscuris ab apicibus anticorum, tibiis fumatis, et tarsis 
cervinis ultimis articulorum fumatis. Sete ¢ grisex, 
@ cineree. 
Imago, v.v.s. ¢. Oculi turbinati fuliginosi. Ter- 
gum thoracis aterrimum, politum. Ale vitrine. Pedes 
vel fumati, vel saturate virescenti-albi, vel prasini; 
posterioribus crurum fumatis, anticis cinereis cum apici- 
bus tibiarum obscuris. Segmentorum abdominis 2-7 
fumata ; cetera supra vel rubigineo-fusca, vel piceo-fusca, 
subtus virescenti-grisea. Sete albe vel cane, sepe 
juncturis vix obscuris. 
?. Oculi fusco-fuliginosi. Pedes virescenti-testacei, 
juncturis tarsorum nigricantibus, Abdomen supra cas- 
taneo-piceum, juncturis et sepe strigis brevibus tribus 
ad bases paucorum intermediorum ochraceis; subtus 
fuliginosum vel hepaticoloratum, pallidum, seepe notulis 
lateralibus L-formatis obscuris. Sete fumatze, vel cane, 
vel canz juncturis rufescentibus. 
Long. corp. d ¢ 6-7°5; al. 3 ¢ 6-7; set. ¢ 10-11, 
subim. 9; set. 9? 6-8°5, subim. 7 mm. 
Hab.—England, and perhaps Sweden. May and June, 
and also September. 
I have seen an undescribed Australian species, which 
is allied to some of the foregoing European species. 
