100 Rey. A. E. Haton’s Monograph 
Long. corp. ? 6, set. 8; exp. al. 18 mm. 
Hab.—Mt. Saleve. (Pict.) 
Professor Pictet’s figure of the nymph of H. cenea 
closely resembles a dark variety of the nymph of HL. 
ignite. 
Ephemerella invaria. 
(Genitalia maris, Pl. V. fig. 8, 8a.) 
Baetis invaria & fuscata, Walk. 1853. Hphemerella 
excrucians, Walsh, 1862. 
Subimago, v.s.s. Alee seteeque pallide nigricantes. 
Imago, v.s.s.- ¢. ‘ Oculi supra flavi, infra fusci”’ 
(Walsh, ev. s.). Tergum thoracis saturate luteum, vel 
fascum. Ale vitrez, vix flavee apud costas; crassioribus 
nervorum lutescentibus vel fuscis. Pedum antici picei ; 
posteriores testacei, tarsis subtestaceis, apicibus junctur- 
isque fuscis vel rubiginoso-luteis. Abdomen supra piceum 
vel fuscum, vel rubiginosum, apicibus segmentorum satu- 
ratioribus ; subtus testaceum. ‘‘ Sete albicantes, juncturis 
fuscis.”” (Walsh.) 
? mari simillima. 
Long. ¢ 5°5-7°5, 2? 5°5-6°5; set. ¢ 11-13, 9 10-1275; 
exp. al. ¢ 145-20, ? 15-19 mm. 
~ Hab.—Nova Scotia (Walker) ; Iinois (Walsh). 
HLphemerella consimilis. 
EH. consimilis, Walsh, 1862. 
Imago, g. ‘“ Pedes immaculati ; antici apicibus tibia- 
rum et proximis articulorum tarsalium fuscis.” (Walsh.) 
Mr. Walsh describes the prescutum of the mesothorax 
as being “half as long again as wide,’ and the meso- 
thorax itself as “being 4-5 times as long as wide:” 
whereas, in the preceding species, the one ‘is scarcely 
longer than wide,” the other is ‘“‘scarcely three times 
longer than broad.” 
Long. corp. ¢ 5, set. circa 5; exp. al. 14 mm. 
Hab.—Rock Island, Illinois (Walsh). 
