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 branchiae. 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 it in economy. The authour thinks 

 it probable that many of the European Botydce found in fenny places, as 

 Bot. lemnata, sambucata, Ike, approach his PetrophilcB, while those 

 found in hedges and gardens should remain in a separate genus. His 

 characters ofPet. Jtuviatilts are as follows : Pe. argcnteo-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 Petrophila would be inadmissible, having been 

 long since applied by Mr. Brown to a New Holland germs of Proteacece. 

 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 tracheae 

 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. 



jlprilG. — ji 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 p6uch, which 



