on the Hphemeride. 137 
Heptagenia nivata, nov. sp. 
(Genitalia maris, Pl. VI. fig. 10.) 
Subimago, v. v. s. ¢ ¢. Alarum antice saturate 
cinerez ; posteriores pallidiores. Pedes olivacei, tarsis 
nigricantibus ; antici obscuratiores. Sete nigra. 
Imago, v. v. s. ¢. Oculi atro-fuliginei, infra paulo 
olivaceo tincti. Tergum thoracis aterrimum, politum. 
Ale vitrine, invariz ; nervi virescenti-grisei, post-cubi- 
tales recti. Pedum antici atro-olivacei, tibiis et tarsis 
atris; posteriores olivacei, tibiis saturate virescenti-albis 
vel cretaceis, atque tarsis olivaceo tinctis. Abdomen 
supra fuscum, juncturis paulo pallidioribus ; subtus oliva- 
ceum. Sete nigricantes, juncturis anguste obscuris. 
9. Post-cubitales vix irregulares. Pedum antici tibiis 
tarsisque saturate nigricantibus ; posteriores tibiis creta- 
ceis, et tarsis nigricantibus unguibus pallidis. Abdomen 
subtus olivaceum, maculis ganghalibus paulo obscura- 
tioribus. Lamina ventralis penultimi segmentorum apice 
lente emarginato. 
Hone! corp. (Gi 2 11; al...¢) 12, 9. 17+ set., gd 27, 
subim. 8; set. ? 12-15 mm. 
Hab.—The stream at Barberine; and Lac de Combal. 
July. It is named nivata from its haunts being chilled 
with snow. 
Heptagenia borealis, nov. sp. 
(Genitalia maris, Pl. VI. fig. 11.) 
Imago, v.s.s. 6. Thoracis tergum piceum. Ale 
vitrine ; nervorum longitudinales pallide fusci. Pedes 
pallide fusci. Abdomen ochraceum, pellucidum; supra 
apicibus et paucis segmentorum apicalium fuscis. Setze 
cervine, juncturis fuscis. 
Long. corp. & al. g 10 mm. 
Hab.—Finmark, between Kautokeino and Karaswando. 
(Walk. MS.) July or August.* 
* An account of Messrs. Walker and Christy’s journey is given in the 
Entomological Magazine (1837) iv. 462-83. 
