178 [October 
E. FLAVEOLA Walsli. A very good and interesting species, received 
by me from Mr. Walsh in 1860. \_See note 20.] 
Ephemerella Walsh. 
E. EXCRUCIANS Walsh. New to me. I must study the genus fur¬ 
ther. Are the eyes really simple ? [Beyond all doubt. B. D. W.] I 
suspect that some Potamanthus, Pictet, (a genus which comprehends 
very different species,) must in that case enter Ephemerella. Lepto- 
pJilehia Westwood, is Potamanthus. 
B^tisca Walsh. 
B. OBESA Say, Walsh. Both genus and species new to me; very 
curious. 
Cloe. 
C. viciNA Hagen, Walsh. A new species with four wings, but pro¬ 
bably C. posticata Say. G. vicina Hagen, has only two wings and the 
colors are paler, a reddish brown. I have received from Mr. Uhler, 
from Maryland, a S imago of a Cloe n. sp. very like C. vicina^ but it 
has four wings. [Nee note 21.] 
C. UNICOLOR Hagen, Walsh. It is the species described by me, 
which has four wings. I only know 3 9 from Washington and 1 % 
from Pennsylvania. 
C. DUBIA Walsh. A new species. In C. vicina the thorax is a pale 
fulvous, and the tip of the abdomen deep brown, immaculate. 
C. MENDAX Walsh. A new species. 
C. FLUCTUANS Walsh. Very like G. undata Pictet, of which I pos¬ 
sess 2 9 from New York and Bed Biver of the North (Kennicott) with 
their setae annulated with brown. The two species cannot be identical, 
for the number of cross-veins and their arrangement is very different. 
Otherwise the abdomen of the 9 is spotted in a very similar manner 
with little dark dots. The two 9 of G- undata have very numerous 
cross-veins, like G. ferruginea Walsh, the abdomen “freckled'^ in the 
same manner. They resemble G. Jluctuans^ but are a little larger, be¬ 
sides having some brown clouds on the hyaline part of their wings. 
The setae have brown incisures; but in one specimen of undata Walsh, 
(the other one has no setae) the basal incisures are brown. 
C. PYGM.®A Hagen, I only possess one 9 imago in bad condition. 
