on the Hphemeride. 123 
albis: area marginalis anticz fusco variegata; area sub- 
marginalis plus aut minus fusca, interdum maculis rotun- 
dis pellucidis inclausis, apice fusco nebuloso; margo 
terminalis peranguste fuscus et albo invicem marginatus : 
ala postica seepe apud basin et usque ad coste medium 
fuscescens. Pedes testacei, vel cervino-albicantes, femo- 
ribus punctis rotundis fuligineis irroratis, paucis con- 
fluentibus, atque tarsis albicantibus juncturis et ultimis 
articulorum fuliginosis. (Abdomen decoloratum.) Seta 
albee, juncturis atris. 
Long. corp. '¢ '5-6°5; al. 6 65-7, 9.7; set. 
circa 14, 2? circa 15 mm. 
Hab.—Texas. 
Baetis (?) undatus. 
Cloe undata, Pict. 1843-5 ; Oloeon undata, Walk. 1853. 
Imago, @.s.s. ‘ Pallide flavescens. Ale vitrine ; 
antica apud marginem costalem fusca, maculis rotundis 
pellucidis variata, fascia transversali in medio nebulosa, 
et nebuli magna super marginem terminalem, fuscescen- 
tibus. Sete albidee, juncturis in ¢ atris, in @ fuscis ” 
(Pict.). ‘* Pedes flavescentes ; tarsorum apices obscuri ” 
( ¢;,Hag.). 
Long. corp. 2 7, set. 10, exp. al. 15-19 mm. 
Hab.—Red River, and New York (Hag.); Mexico 
(Pict.). 
Baetis fasciatus. 
Cloe fasciata, Pict. 1843-5 ; Cloeon fasciata, Walk. 1853. 
Imago, ?.s. 8s. “Tergum thoracis pallide fuscum. 
Ale vitreze: antica margine costali, fasctis transversali- 
bus obliquis duabus, strigis transversali obliqua prope 
marginem terminalem alteraque brevi super marginem 
terminalem ita conjunctis ut maculas pellucidas claudunt, 
et macula trigonali e costa inter strigam et ultimam fascia- 
rum fasciz ipsi conjuncti, et denique maculd conspicud 
in medio inter basin et primam fasciarum, fuscis. Abdo- 
men saturate fuscum, setis lutescentibus fusco annulatis.” 
(Pict.) 
Long. corp. 9 7, set. 8, exp. al. 19 mm. 
Hab.—Brazil. (Pict.) 
