136 Rev. A. E. Eaton’s Monograph 
Heptagenia semicolorata. 
(Genitalia maris, Pl. VI. fig. 9.) 
Ephemera stigma (?), Gmel. 1790-38. 2. fuscula (?), 
Schr. 1798 (subim.). Baetis semicolorata, Curt. 1834. 
B, semitincta (?), Pict. 1843-5.* 
Subimago, v. v.s. Ale antice grises ; postice pal- 
lide cervinze vel fumatee. Pedes virescenti-grisei, femor- 
ibus in mediis obscure punctatis, tarsisque corvinis vel 
atro-virescentibus. Setee nigricantes. Oculi maris satu- 
rate olivacei, cingulis atris in medis. 
Imago, v. v.s. &. Oculisupra saturate picei, cingulis 
subtus atris marginibus cerulescenti-griseis. Tergum 
thoracis fusco-luteum. Ale vitrine, nervis et basibus 
rubiginosis. Pedes virescenti- grisei, strigis abbreviatis 
longitudinalibus in mediis femorum, cruribus anticis 
nigricantibus, sed posterioribus tarsorum vel ochraceo- 
fumosis, vel stramineis plus aut minus corvino tinctis, 
vel fulvis unguibus obscuris. Abdomen supra fuscum, 
apicibus segmentorum obscuris et juncturis pallidis; 
subtus saturate murinum. Setze fuliginose, vel nigri- 
cantes. 
2 . Alee vitrine, crassioribus nervorum longitudinalium 
testaceis, tenuioribus atro-fuscis, et transversalibus atris ; 
vel omnibus testaceis. Oculi atro-olivacei. Abdomen 
supra ochraceo-furfurosum, juncturis pallidissimis ; subtus 
testaceum. Processus ventralis penultimi segmentorum 
emarginatus. 
Long. corp. ¢ 7°5-10, 9 7°5-9; al. g 10, 2 10°5; 
set. ¢ 23-25, subim. 8-9; set. 2? 14, subim. 10 mm. 
Hab.—Great Britain, Switzerland, and Austria; in cold 
streams and the rapids of rivers. June to September. 
* The specimens labelled semitincta in M. Ed. Pictet’s collection, are 
indistinguishable from a pale variety of semicolorata, which occurs in the 
Lake District of England. It seems advisable, notwithstanding, to state 
M. Pictet’s criteria of semitincta, in case the species should be really 
distinct from one another. 
Subimago. ‘Ale pallide flavescenti-grisee. Corpus virescenti- fla- 
vescens.”’ 
Imago. ‘ Thorax striga dorsali pallida. Femora antica acute fulva.”’ 
Hab.—A small stream at Versoix, on the Lake of Geneva, in the middle 
of June. (Pict.) 
One can hardly doubt that it is a species distinct from semicolorata. 
