1863.] 
193 
only J as long as the body and one leg a trifle longer than the other. 
(See Dr. Hagen’s remarks p. 176 lines 2-—6.) 
Note 12, p. 171. I have translated Dr. Williamson’s description 
from the original Latin, either of Dr. Williamson or Dr. Hagen, but 
apparently the latter. The “two eggs’’said to be laid by $ , are no 
doubt the two long, cylindrical yellow masses, each consisting of nu¬ 
merous minute eggs^ which are laid by so many other Ephemerina. 
Instead of having the vulvar aperture located under the tip of the 
antepenultimate ventral, as in Perlina and Odonata, Ephemerina have 
it located under the tip of the prae-antepenultimate^ which, so far as I 
know, does not occur in any other family of Insects, and has not been 
noticed by authors. This species will, I suspect, prove to be congene¬ 
ric with my Gloe ferruginea for the following reasons:—1st. It is said 
to have “no ocelli,” and in ferruginea the eyes overhang and conceal 
the two posterior ocelli. 2nd. The hind wings are described as “ nar¬ 
rower” than the others, as in all true Cloe that have any hind wings, 
and the wings are said to be “reticulate,” which is true of all four 
wings in ferruginea^ but not in any other Cloe known to me. 3rd. The 
subimago of ferruginea has the wings partly whitish hyaline, and the 
wings of Bxtis (palingenia) alha Say are described by Dr. Hagen as 
“whitish with the anterior margin grayish” in the subimago. I doubt 
whether any Ephemerinous imago has opaque whitish wings, though 
Palingenia, Hecuba Hagen, imago, is described as having “ opaque 
grayish-rosy wings.” Possibly in this case Dr. Hagen was led to be¬ 
lieve the specimen to be an imago, because it had “a mass of eggs in 
the vulvar aperture,” but I shall show afterwards that the subimago 
occasionally oviposits in Palingenia, hilineata. (See Note 16, line 9.) 
POTAMANTHUS. 
Note 13, p. 172. I failed to identify odonatus Walsh with nehulo- 
sus Walker, because Mr. Walker’s description says “anterior wings 
with a broad longitudinal fuscous band,” by which I supposed him 
to mean a vitta extending from the base to the tip of the wing, as 
many authors, e. g., DeG-eer, make no distinction between a fascia or 
band and a vitta or longitudinal stripe. It is very satisfactory that I 
should have referred to the right genus this fragmentary specimen, 
which had lost both the head and the abdomen, upon which parts and 
their appendages the ordinary generic characters in Ephemerina are 
