on the Ephemeride. 127 
Anglers in Wales, mistaking this for Hphemera danica, 
are greatly astonished at seeing the subimago rise out of 
the cold tranquil “llyns.” One of my specimens remained 
a subimago during the greater part of two days. 
There are some specimens of a small undescribed 
(probably German) species in Mr. M’Lachlan’s possession, 
which is very similar to S. lacustris. 
Siphlurus Linnceanus, nov. sp. 
(Forceps maris, Pl. VI. fig. 3. Notulze ventrales, fig. 3a.) 
Imago, v.s.s. ¢. Tergum thoracis fusco-rubiginosum. 
Ale vitrine, vix fusco suffuse, nervis longitudinalibus 
piceis, bases versus testaceis. Pedes ochracei, femoribus 
singulis cingulis medius obscuris. Dorsum abdominis 
fuscum, apicibus seementorum saturatioribus, et triangulis 
pallidis ad latera segmentorum intermediorum: subtus 
2-8 segmentorum pallide ochracea, singula signis obscuris 
bicornutis punctisque atris duobus eleganter notata; 
cetera subtus saturate rubiginosa. Set ochro-leuce, 
juncturis fuscis. 
Long. corp. ¢ 15, set. 26, al. exp. 26 mm. 
Hab.—Incog. There is a specimen in the Linnean 
cabinet, and the abdomen of a male in Mr. Dale’s collec- 
tion. 
Siphlurus annulatus. 
(Forceps maris, Pl. VI. fig. 4a. Notulee ventrales, fig. 4.) 
Baetis annulata, Walk. 1853. 
Imago, v.s.s. 6. Tergum thoracis brunneo-luteum. 
Ale vitrine, vix lactescentes, nervis piceis: apex arez 
marginalis anticee nebula pallidissima fusci. Pedes 
ochracei, juncturis et femorum cingulis mediis piceis. 
Dorsum abdominis pallide fuscum, latera versus ochra- 
ceum: venter ochraceus, segmento singulo intermedio 
strigis longitudinalibus duabus punctisque tribus fuscis. 
Setz ochracez, juncturis piceis. 
Long. corp. ¢ 13, al. 15, set. 18 mm. 
Hab.—Trenton Falls, New York. 
