PSYCHE. 
from a long pairing of S. ceanothi 2 with 
S. gloveri %, were the only ones that were 
fertile. Unfortunately the larvae, reared 
on willow and plum, all died, some reach- 
ing, like S. ceanothi, the third stage. 
The pairing of S. ceanothi 2? with S. glov- 
ert %, was from the evening of 20 to the 
evening of 21 May. The larvae hatched 
from 15 to 21 June; the majority having 
hatched 16 and 17 June. 
First stage. Larger larvae, black ; small- 
er ones, fallow; the colors becoming of a 
more uniform hue as the larvae increased 
in size. Very much like S. cecropia larvae. 
Second stage. Larvae yellow, with black 
tubercles ; head black. Third stage. Back, 
bluish ; sides, yellow. Tubercles on back, 
113 
orange-red ; tubercles on sides, blue ; head, 
yellow. 
The other crossings resulting from the 
keeping of various species together in large 
cages, when % and 2 moths of the same 
species were not obtained at the same time, 
in a hot-house, 22 May, 
Telea polyphemus 2 and Attacus mylitta 
% of the Bombay race; J. polyphemus & 
and Attacus pernyt &; Samia gloveri 
and A. pernyi $: in my house at ordinary 
temperature, 12 and 13 June, Samia ce- 
anotht 2 and S.cecropia % ; 15 June, S. 
glovert 2 and S. cecropia $ ; 18 and 19 
June, S. cecropia 2 and S. ceanothi $. In 
all the above cases, the ova were infertile. 
are the following : 
ON AN AQUATIC SPHINX LARVA. 
BY HERMANN AUGUST HAGEN, CAMBRIDGE, MASS. 
The following letter from the Baron von 
Reizenstein, in New Orleans, La., was sent 
to me as a scientific communication by Dr. 
J. L. LeConte, of Philadelphia : — 
‘¢ From larvae and pupae of a sphinx in 
my possession, there is every reason for be- 
lieving that I have made a new acquisition 
to the lepidopterous fauna of Louisiana. 
They belong to the genus Philampelus, but 
the larvae far exceed in size those of the 
other known sphingidae, even of the true 
sphinx Macrosila rustica (Sphina chion- 
anthi). I found the larvae feeding on the 
floating Nymphaea, in the very centre of a 
draining canal in the outskirts of the city. 
When I discovered them, their whole body, 
with the exception of the first three segments, 
was submerged in the water. When they 
had devoured one patch of the water plants, 
they swam with great facility to a new one, 
the first instance I ever experienced of this 
habit in the larva of a sphinx, or in any 
caterpillar. As I am familiar with all the 
other known larvae of the genus Philam- 
pelus, and it is not probably that of Ph. 
labruscae, a strictly tropical species, which 
I do not know, so it is very likely an entirely 
new species. 
Of the other species of Philampelus (pe- 
culiar only to the new continent) are until 
now only known and described: Philam- 
pelus vitis Linn., Ph. achemon, Ph. satel- 
litia, Ph. fasciatus, and Ph. lycaon Cram. 
(posticatus Grote), all occurring here, ex- 
cept achemon, a northern species, and whose 
larvae are all known to me. 
There remains then only Philampelus 
labruscae, which I do not believe is the 
sphinx in question. Of 25 larvae (now all 
pupae) in my possession, I preserved one 
in alcohol, to have an ‘‘ argumentum ad 
hominem” for a further occasion, when I 
will prepare a correct drawing of the in- 
sect in all its stages. 
