on the Hphemeride. 89 
brevissima. ‘Tarsorum posteriores quinque -articulati ; 
articulorum primus obsolescens, tibiz adnatus, secundus 
tertio subeequalis, quartus ceteris brevior ; itaque sepe 
quadri-articulati esse videntur. 
Leptophlebia cupida. 
(Genitalia maris, Pl. IV. fig. 29, 29a; femine, fig. 29b. 
Alee anticee pars, Pl. II. fig. 2b.) 
Ephemera cupida, Say, 1823. Palingenia concinna, pal- 
lipes, Baetis debilis & (?) EH. hebes, Walk. 1853. Pota- 
manthus cupidus, concinnus, & Baetis ignava, Hag. 1861. 
Subimago, v. s. s. Ale pallide nigricantes; ‘ pos- 
teriores apices versus vix saturatiores.” (Say.) 
Imago, v. s. s. ¢. ‘*Oculi supra fuscescentes, infra 
atri” (Say, e v. s.). Tergum thoracis piceum vel fuscum. 
Alze vitrine, nervis et apice aree marginalis antice pal- 
lide fusco-piceis. Pedum antici fuscescentes vel vix 
rufescentes, tarsis atris; posteriores testacei, tarsis ni- 
gricantibus. Abdomen piceum, “supra juncturis, linea 
longitudinali in medio strigisque brevibus duabus apud 
basin segmenti singuli, pallidis” (Say, e v. s.). Sete 
fuscee, juncturis obscuris. 
? . Alee vitrine, vix lurido tinct. Processus ventralis 
penultimi segmentorum emarginatus. 
Long. corp. $ 8, 9 10; al. ¢ 8, 2 11; set. ¢ subim. 
14, 9 15 mm. 
Hab.—Nova Scotia (Walk.); the Ohio River near Cin- 
cinnati (Say); Washington (Hag.), &c. 
Leptophlebia nebulosa. 
(Genitalia maris, Pl. V. fig. 1, 1a.) 
Palingenia nebulosa, Walk. 1853; Potamanthus nebu- 
losus, Hag. 1861. Pot. odonatus, Walsh, 1862. 
Imago ¢, v. s. s. Thoracis tergum piceum. Ale 
vitrinz, nervis piceis; antice singule nebulis magnis 
rotundatis apices versus subfuscescentibus. Pedum an- 
tici fusci, posteriores testacei. Abdomen supra piceum, 
subtus subtestaceum. Sete testacez, juncturis piceis. 
Long. corp. ¢ 10, al. 10-11, set. 30 & 6 mm. 
Hab.—S. Martin’s Falls, River Albany, Hudson’s Bay 
(Walk.); Illinois (Walsh). 
