112 Rev. A. E. Eaton’s Monograph 
Hab.—Great Britain, France, Switzerland (Pict.), 
Germany, Moscow (Oul.), Scandinavia, and Hudson’s 
Bay (Dale Mus.). May to October. In rivers. 
Mr. Walker’s specimen from N. America (g., Brit. 
Mus. Cat.) represents a distinct and undescribed species. 
Baetis debilis. 
Cloeon debilis, Walk. 1860. 
Imago ?, v. s. s. ‘ Fulva, capite nigro, abdomine 
testaceo; setis pedibusque albis, alis vitreis, venis albis.” 
Long. corp. 5, exp. al. 12 mm. 
Hab.—Hindostan. (Walk.) 
This species can only be identified by the type. 
Baetis scambus. 
(Forceps et ala postica, Pl. V. fig. 17, 17a.) 
B. scambus, Etn. 1870. 
Subimago, v. v.s. . Ale setaeque cinerex. Pedes 
cretacei vel virescenti-albi, tibuis tarsisque cinereis. For- 
ceps cretaceus. 
@. Femora maculis vix discretis, subapicalibus cinereis. 
Imago, v. v. s. ¢. Oculi turbinati caryophyllacei, 
vel caryophyllaceo-fuliginosi: inferiores nigri. Tergum 
thoracis aterrium vel piceum: alze vitrine. Pedes 
cretacei vel virescenti-grisei; tarsis anticis fumosis, pos- 
terioribusque tibiarum et tarsorum virescenti-albis, junc- 
turis et unguibus vix obscuris. Abdominis segmentorum 
quatuor apicalia fusca, cetera alba vel virescenti-alba, 
fusco vix suffusa. Sete albze, prioribus juncturarum vix 
obscuris. 
@. Corpus olivaceo-fuscum. Ale vitrine, nervis atro- 
piceis. Oculi saturate olivacei. Femora olivacea ; tibiae 
tarsique saturate fumosi. Seta quoque fumosz, junc- 
turis vix obscuris. 
hong. corp. ¢ 6, 9 6:5; al. 6 0; 9 72 Setencamics 
subim. 7; set. 2 9-10, subim. 5 mm. 
Hab.—Ashbourne and Norbury, Derbyshire. June and 
September. 
