72 Rey. A. E. Eaton’s Monograph 
@. Simillima mari. Prothoracis tergum virescenti 
griseum, strigis lateralibus atris duabus. Meso- et meta- 
thoraces lutei, strigis obscuris inter alas duabus. Ale 
vitrine, nervis transversalibus atris, et nervis longitudi- 
nalibus cum areis marginalibus et submarginalibus, vires- 
centi-griseis. Pedes antici fusci, apicibus femoris, tibie, 
articulorumque tarsalium, atque tibize basi, atris. Caput 
ochraceum, circa ocellos luteum, oculis (veluti in @) 
fuligineo-umbrinis. 
Long. corp. ¢ 15-20, 9 21-25; al. g 16, 9 20-21 ; 
set. ¢ 30 & 35-6; set. ¢ im. 24 & 26-25 & 24, subim. 
15 mm. 
Hab.—The Thames, and the Kennet, near Reading ; 
near Paris; and Genthod, near Geneva. June and July. 
It frequents rivers or tranquil waters. 
I have no doubt that the two females referred by Dr. 
Hagen to #. glaucops, Pict. subim. (Hag. 1863), were 
specimens of H. lineata. The H. danica of M. Pictet’s 
collection is #. vulgata, Lin. 
Ephemera danica. 
(Genitalia maris, Pl. IV. fig. 8. Macule abdominalis, 
fig. 8a.) 
EH. danica, Mil. 1764. EH. maculata, Vill. 1789. 4H. 
vulgata, Don. 1795. LH. cognata, Ste. 1835-6. H. his- 
panica, Rbr. 1842. 
Subimago, v. v.s. Ale: fumate, nervis atris, lutescen- 
tibus bases versus; vel flavo-virentes. Pedes lutei, tibiis 
et tarsis posticorum flavo-virescentibus, apicibus articu- 
lorum nigricantibus. Abdomen flavicans, maculis corvinis, 
et setis piceis. 
Imago, v. v.s. ¢.Caput et tergum thoracis aterrima 
vel picea ; os et prosternum straminea; oculi fuliginosi. 
Alee vix corvinee; antice areis marginalibus et submar- 
ginalibus anthracinis, maculis fuscis, et nervis atris. 
Pedum antici atri; posteriores atro-fusci, juncturis satu- 
ratioribus. Abdomen cretaceum, postice szpe fusco 
suffusum: posteriora segmentorum strigas quatuor supra 
habent, infraque lineas longas, atras vel fuscas, duas ; 
anteriora lineis intermediis supra carent, vel etiam omni- 
bus. Sets piceze. 
