on the Ephemeride. 151 
et apud basin segmenti singuli supra lineole pallida 
longitudinales dus sunt. Sete fusce, juncturis obscuris. 
Pedes saturate rubiginosi, femoribus bicinctis, 
?. Processus ventralis penultimi segmentorum in- 
teger. 
Hong. corp. ¢ 12; aly ¢ 13, 9 14°35; set. 35 mm. 
Hab.—The St. Lawrence; Chicago; Washington (Ha- 
gen); Savannah (Osten Sacken). 
Heptagenia venosa. 
(Genitalia maris, Pl. VI. fig. 24.) 
(?) Ephemera maculata, Pod. 1761. EH. venosa, Fab. 
1775. (?) EH. berolinensis, Mul. 1776. EH. fusco-grisea, 
Retz. 1783. H. nervosa,* Vill. 1789. Baetis dispar, Curt. 
1834. B. venosa, Ste. 1835-6. H. rufa, Ramb. 1842. 
(?) B. purpurascens & forcipula, Pict. 1843-5. B. longi- 
cauda, Ron. 1856 (nec Ste.). Hedyurus venosus, Etn. 1868. 
Subimago, v. v.s. Ale pallidissime cervine, nervis 
transversalibus fuscis nigricanti marginatis, fasciis trans- 
versalibus pallidis indistinctis duabus trajectis; area 
submarginalis areszeque marginalis apex flavescenti tincti, 
fasciis obscuris interrupti. Pedes cinereo-olivacei, tarsis 
cinereis. Setze fuscee. 
Imago, v.v.s. <¢. Oculi supra atro-picei, vel picei ; 
subtus apud orbitas ochracei, linea griseainterposita. Tho- 
racis tergum fuscum. Al vitrine, nervis corvinis ; apex 
are marginalis nigricanti tinctus. Pedum antici fusco- 
corvini, tarsis corvinis ; posteriores saturate virescenti- 
grisel, genubus. tarsisque corvinis. Abdomen supra 
fuscum, vel fuliginoso-hepaticoloratum, latera versus pal- 
lide testaceum, strigis lateralibus fuscis obliquis ; subtus 
saturate brunneo-hepaticoloratum. Sete fusce. 
@. Mari simillima. Processus ventralis penultimi 
segmentorum integer. 
Long. corp. g 12-14, 2? 12-18; al. 6 18, 2 15-17; 
set. g 30-48, 9 15, subim. 17 mm. 
Hab.—Scandinavia (Zet.); England; Belgium (De 
Selys); France ; Switzerland; Dalmatia (Pict.); Corsica 
(Hag.). Instreams. June. 
* M. Pictet (1843-5) unfortunately cited this synonyme as one origi- 
nated by Fabricius. 
