264 Zoological Proceedings of Societies. 
close a resemblance to his Petrophila in many respects, that he is per- 
suaded of their near affinity, although there exists a trifling difference in 
the pupal spiracula, and in the shape of the branchie. The larva of the 
West Indian species, obtaining its food on rocks in the stream, forms silken 
tunnels, under which it moves in safety, without danger of being carried 
off by the current. When at maturity it builds a more compact habita- 
tion, which, together with the metamorphosis of the insect, is minutely 
described, as well as a small Trichopterous insect found in great abun- 
dance in its society, and resembling itin economy. The authour thinks 
it probable that many of the European Botyde found in fenny places, as 
Bot. lemnata, sambucata, &c., approach his Petrophile, while those 
found in hedges and gardens should remain in a separate genus. His 
characters of Pet. fluviatilts are as follows : Pe. argenteo-nivea, fuscescente 
adumbrata, alarum superiorum strigis apicalibus angulatis, punctulis 
duobus intermediis lineisque baseos tribus subcommunibus fuscescentibus: 
alarum inferiorum plaga postica argenteo-iridescente, atro-maculata : ab- 
domine fusco fasciato. Mr. Guilding’s genus appears to us to be nearly, 
if not entirely, identical with M. Latreille’s Hydrocampe. We may ob- 
serve also that the name of Petrophi/la would be inadmissible, having been 
long since applied by Mr. Brown to a New Holland genus of Proteacee, 
Subjoined to the paper is an addition to the Natural History of Xylo- 
copa Teredo, and several other insects which had been the subjects of 
former communications, accompanied by additional drawings, to com- 
plete the description and figures given in Linn. Trans. vol. xv. 
March 16.—A Paper was read, On the remarkable formation of the 
Trachea of the Fyyptian Tantalus, by Joshua Brookes, Esq., F.R.S., 
and L.S. The structure in question, which is unique so far as the trachee 
of birds have yet been investigated, consists of a remarkable flattening 
and consequent dilatation of the lower part of the canal above the 
divarication.of the bronchi. A specimen was exhibited to the meeting. 
April 6.—A further description of the Anatomy of the Mammary 
Organs of the Kangaroo, by J. Morgan, Esq., F.L.S., was read. This 
paper is a sequel to that printed in the last part but one of the Linnean 
Transactions, and abstracted at p. 127 of our last volume. 
After a few remarks on the domestication of this animal as the only 
means of -making those examinations of the interior of the pouch, which 
