116 Rey. A. E. Eaton’s Monograph 
Pedes femoribus olivaceis; crura cana vel anthracina 
juncturis atris, sed antica saturatiora. Setz albze, cor- 
vines bases versus. 
Long. corp. ¢ ¢ 6-8; al. ¢ 6-7, 9 7-93 set. 3 14- 
16, subim. 5; set. 2 10-12, subim. aan. 
Hab.—Great Britain, and Norway (Hammerfest and 
Alten). It mostly inhabits streams and rivulets, and 
appears in England in May, June, September and Octo- 
ber. 
Baetis tenazx. 
(Forceps et ala postica, Pl. V. fig. 22, 22a.) 
B. tenaz, Etn. 1870. 
Imago, vy. v. 8s. @. Oculorum turbinati saturate fali- 
ginosi, inferiores nigro-fuliginosi. Tergum thoracis ater- 
rimum, politum. Ale vitrine, nervis albido-pellucidis. 
Pedes femoribus olivaceis, anticis crurum cinereis, et 
posterioribus fumosis juncturis vix obscuris. Abdomen 
fusco-olivaceum, juncturis pallidis, et setis albis. Pes 
forcipis albicans, proximo articulorum interdum obscu- 
rlori. 
¢ mari simillima. 
Long. corp. ¢ 6-8, al. 7, set. 14-16 mm. 
Hab.—Ashbourne Green, Derbyshire; in rills and 
streamlets. June. 
Baetis buceratus. 
(Forceps et ala postica. Pl. V. fig. 23, 23a.) 
B. buceratus, Etn. 1870. 
Subimago, v. v. s. Alarum antice fumate, posticas 
pallidiores. Pedum antici femoribus olivaceis, tibiis nigri- 
cantibus, et tarsis atris; posteriores vel olivacei tarsis 
et maculis pre-apicahbus femorum crescentiformibus 
atris, vel femoribus saturate cretaceis, tibiis fumosis, et 
tarsis atris. Sete pices. Pes forcipis primo et secundo 
articulorum pallidis, reliquis fumosis. 
Imago, v. v. 8s. @. Oculi turbinati saturate fuligi- 
nosi, vel fuliginoso-hepaticolorati. Tergum_ thoracis 
