62 
5. TrocuiLus (——?) FLORICEPS. 
Forehead buffy white, passing into a beautiful deep peach-blossom 
hue on the crown; throat grey, passing into the rufous of the abdo- 
men; middle tail-feathers bronzy ; lateral tail-feathers largely tipped 
with buff. 
Total length, 3} inches; bill, 4,; wing, 14; tail, 1,5. 
Hab. Sierra Nevada of Santa Martha, at an elevation of 5000 feet. 
May 10, 1853. 
W. Yarrell, Esq., in the Chair. 
The following paper was read :— 
On a New Species or THALASSIDROMA. 
By Greorce Rosert Gray, F.L.S. & F.Z.S. 
A specimen of a Stormy Petrel, from the north-west coast of Ame- 
rica, has lately been kindly presented to the British Museum by Miss 
Hornby ; as it differs from all those that I am acquainted with, I 
am induced to bring it before the meeting. 
In form it agrees best with Thalassidroma furcata, but the colo- 
ration differs much in several particulars.—Front, cheeks, throat, 
collar round the hind part of the neck, breast and abdomen pure 
white; crown, hind head, a broad band in front of neck, bend of 
wing and lesser wing-coverts sooty grey ; upper part of back grey ; 
lower part of back and tail ashy grey; greater wing-coverts brownish 
grey; tertiaries and quills deep black. 
Total length, 81; bill from gape, 103", from front, 83'"; tail 
(outer feather), 33"; tarsus, 1; middle toe, 1". 
I propose to give this species the appellation of Thalassidroma 
Hornbyi, after Admiral Hornby, who obtained it during his com- 
mand on the Pacific station, where he collected many interesting 
animals for his brother-in-law, the late President of this Society. 
