88 
[September, 
on the outer margin of tlie wings. The ^ has the third joints of its 
4-jointed forceps the longest, and the upper divisions of its double eyes 
turbinate. Egg-valve of ? bipartite. 
Genus Baetis,* Leach. 
Syn. Baetis, B, Steph., Curtis. 
Cloe, B, Burm. 
Brachyplilehia, "Westw. 
Cloeon, Hagen, p., Etn. 
Type B. hioculatus, Lin. 
Distrib.— Europe ; Madeira, Egypt ; Hindostan ; Hudson's Bay. 
Section A, B. luteolus, Miiller, = G. translucida, Pict. 
Eorceps as in Cloeon, egg- valve entire. Posterior wings acute, with 
two simple veins. Branchial plates of the aquatic insect single. A 
series of short, solitary, supplementary vemlets proceeds from the 
outer margin of the anterior wing. 
Distrib.— England, Denmark, Switzerland, 1 sp. ; Germany, 1 sp. 
Section B, B. hioculatus, Lin. 
Syn. Brachyplilelia, "Westw. 
Species conforming to this, the typical section of the genus, differ 
from the former group in the following particulars only. Anterior 
wings with the short supplementary veinlets on the outer margin in 
pairs. Posterior wings obtuse, with two or three longitudinal veins 
(the second of which is either simple, bifid, or bipartite, according to 
the species), and with more or fewer short supplementary veinlets at 
the apex. Tlie fourth joint of the forceps seems never to be pyriform 
as it is in Cloeon, and in the preceding section of Baetis. 
Section (?) C, B. tristis, Hagen, = Gloe tristis, Hagen. 
Distrib.— Ceylon. 
I have only seen a ? sub-imago of this species, which may typify 
a separate genus. 
Mr. Walsh and Dr. Hagen have described several N. American 
species of Cloe, but I have not seen any representatives of the sections 
in which they have arranged them. 
* Probably a misreading of Bffitis, the Latin name of a Spanish river (the Guadalquivir), which Is 
used in some atlases. 
