402 Dr. Hagen's and the Rev. A. E. Eaton's 
in fact about as long as she could have been expected to 
live after oviposition if she had never entered the water.] 
Page 120, note No. 2. [If after the Avord "longissimis" 
in the diagnosis ociilis be supplied, B. speciosus might be 
referred to Heptagenia Jiiiminum $ im. The length 
" 3 lin." in German lines Avould be equivalent to half an 
inch English measure, or nearly 13mm., which is the size 
oi H.Jiuminum $ according to Pictet.] 
Page 123. Baetis undatus {Jluctuans j , AYalsh, p. 122 ; 
jnctus, Etn. p. \22 ; ferrugineus $, Walsh, p. 124). — 
B. pictus agrees after the description and the neuration of 
the hind wing very Avell with the two types of my CI. un- 
data from New York and the Red River. It also agrees 
perfectly well with the male type of Cl.ferrugineus, Walsh, 
from Rock Island, Illinois. Two females in Harris' col- 
lection, marked down by Say in his own handwriting as 
Baetis descripticostata from Dublin, N. Hampshire, are 
the same species. I once compared two type's, of C. Jluc- 
tuans, Walsh, and I am now of the opinion that they 
belong to the same si)ecies. I believe I can see in one of 
the hind-wings the short longitudinal nervure not seen by 
Walsh. The two females difter in so far as they have 
very many fewer cross-veinlets in the fore-Aving, especially 
near the terminal border and tip. I cannot noAv find any 
other difference, as their general arrangement is the same 
(though it Avould seem to be different by my communi- 
cation to Walsh, p. 178). The other females also differ 
in the number of the cross-veinlets, but not so much. 
One has the border much less coloured Avith broAA'n. The 
peculiar dotting of the body, &c. seems to prove completely 
the identity of C. ferrugincus awdi Jluctuans as male and 
female of undatus. I have not seen Pictet's species. The 
figure is a bad one, but the description makes me believe 
in its identity Avitli my nndata, especially as your speci- 
mens are from Texas. Of course it is possible that other 
similarly coloured species may exist, though none so pecu- 
liarly marked are knoAvn as yet. 
[The omission of any mention of the dotted marking of 
the legs and abdomen in the descriptions previously pub- 
lished, led me to fancy that the Texan sjiecimens repre- 
sented a ncAv species, for I have not met AA'ith any similar 
pattern of leg-colouring in any other of the Epheraeridje ; 
This bar to the union of the four supposed species being 
