on the Ephemeride. 117 
aterrimum. Ale vitrine, tribus prioribus nervorum 
longitudinalium vix obscuris. Pedum antici saturate 
olivacei, cruribus atro-corvinis, vel nigricantibus maculis 
pre-apicalibus tibiarum atris, et juncturis tibio-tarsalibus 
albicantibus: posteriores vel femoribus et tibiis olivaceis 
atque tarsis fumosis, vel tarsis atro-corvinis juncturis 
atris; vel cruribus pallide nigricantibus, juncturis vix 
obscuris ; vel cruribus albis, juncturis atris. Abdomen 
supra vel fusco-piceum, juncturis pallidis ; vel cum 2-6 
segmentorum virescenti-griseis, et interdum apicibus, 
lineolis divergentibus duabus dorsalibus, atque strigis e 
spiraculis, obscuris: infra nigricans, juncturis albidis, seepe 
duobus segmentorum apicalium ochraceis. Pes forcipis 
primo et secundo articulorum olivaceis, et ceteris plus 
aut minus nigricantibus; aut primo solum olivaceo. 
Setze nigricantes, seepe albicantes apices versus. 
I neglected to describe the female. 
Long. corp. ¢ 8-9, al. 8, set. 10-16 mm. 
Hab.—The Holybrook and Kennet, near Reading. 
April and May. + 
Baetis amnicus, nov. sp. 
(Forceps et ala postica, Pl. V. fig. 24, 24a.) 
Imago, v.v.s. 6. Oculiturbinati saturate fuliginosi ; 
inferiores atro-fuliginosi. ‘Thoracis tergum aterrimum, 
suturis pallidis. Alee vitrine, lurido tinctz, nervis atro- 
olivaceis; anticz areis marginalibus apices versus paulo 
obscuratioribus. Pedum antici saturate viresceuti-grisel, 
tibis tarsisque fumatis vel nigricantibus; posteriores 
femoribus imterdum vix ochraceo-tinctis, genubus ru- 
fescenti strigatis, tibiis fere cervinis, et tarsis obscuris 
juncturis nigris. Abdomen supra fuscum, juncturis vix 
pallidis; subtus in majore parte cinereum. Setz albee 
vel cinerez, bases versus juncturis obscuris. Forceps 
ater, apices versus saturate fuliginosus. 
- 9. Ale vitrine, nervis virescenti-griseis. Pedes 
virescenti-grisei vel olivacei, tibiis tarsisque nigricantibus. 
Sete nigricantes. 
Long. corp. ¢ 9-10, 2 7; al. ¢ 10, 2 8; set. g 26, 
9 13 mm. 
Hab.—Barberine, Nant Bourant, and Mottet, at an 
altitude of some 4560 feet. July. In mountain torrents, 
whence the specific name. 
