Notes on the EphemeridcB. 395 
dition, witli tarsus of the hind legs (I believe) four-jointed, 
the wings as in Leptophlebia, and the hind wings as in 
your fig. 24. 
Lept. signata [Monogr., p. 132, foot-note. No. 4] is 
perhaps Leptophlebia ; and, so far as I can see, the only 
Ceylon species with three sette, as I stated before. 
Page 84. Leptophlebia Colombia. Baetis tessellata, 
Hagen. You say the type is in the Berlin Museum ; but 
I say (p. 51), at the end of Baetis, "I saw a species of 
Baetis, from Mexico, in the Berlin Museum." B. tessel- 
lata is still in my collection ; a female subimago, with 
posterior tarsi four-articulate. 
[Insert here the foot-note to p. 150 in the Monograph. 
The possession of four-jointed hind tarsi quite falls in with 
my conjecture.] 
Page 85. Leptophlebia marginata. In May, 1853, I 
caught, in a small river near Konigsberg, a very common 
nymph, which I think may be referred with certainty to 
this species. The living nymphs are dark brown and 
polished : in alcohol they easily lose the gills. Roesel, II., 
xii., 1, 2, seems to figure my larva and subimago. His 
observation of the copulation of the subimago seems to be 
an error. I still possess the nymph. 
Page 86. [Line nine from bottom ; for " maroon-brown " 
read " castaneous."] 
L. ? Krueperi. [Herr Stein, in May, 1871, wrote to 
Mr. M'Lachlan asking him to tell me that this species, 
according to his later observations, " does not belong to 
L^eptophlebia, but to Baetis, Leach. The mutilated indi- 
viduals possess the remains of only two tails, instead of 
three." It was the colour of the insect which had most to 
do with my questioning the reference of this species to 
Potamanthus, Pict.] 
Page 87. Leptophlebia Picteti. 
[Imago $ V. s. s. Ven^e in areas marginalis apice sim- 
plices rect£e. Crura posteriora albida. Setfe fusco-piceae, 
juncturis piceis. 
Habitat. — Pallanta, Italy. August. 
The lobes of the penis are narrow, and towards the 
