Zoological Society. 305 
in size, and in having a slender beak ; they differ, however, in having 
the beak stronger and compressed; the upper mandible straight, or 
even slightly recurved; its apical portion strongly hooked, and di- 
stinctly notched ; its cutting edges are curved inwards, so as to in- 
close the corresponding edges of the under mandible. But the most 
remarkable character consists in the existence of three or four small 
notches in the edge of the upper mandible, on either side, and behind 
the ordinary notch which characterizes the Dentirostres. 
“The Prince of Musignano first noticed these peculiarities in a 
bird from Mexico, and described them in the ‘ Nuovi Annali delle 
Scienze Naturali,’ where he used the name Agrilorhinus to distin- 
-guish generically the bird in question. 
**T have now the honour of laying before the meeting four new 
species of this interesting genus; three from a collection belonging 
to the Earl of Derby, which I am informed was made at S* Fé de 
Bogota, and one from the Society’s museum, the precise habitat of 
which is not known; there are reasons, however, for believing it to 
be a Mexican bird. 
“The Prince of Musignano is of opinion that the genus Agrilo- 
rhinus has affinities both with the Sitting and Sylvicoline. The 
strong notch in the upper mandible, its distinctly curved point, and 
the compressed form of the beak, combined with the well-developed 
vibrisse, lead me to believe that this genus ought rather to be re- 
garded as a somewhat aberrant form of Laniade. 
Acrinoruinus Bonapartei. Agr. in toto niger, humeris exceptis, 
his cerulescenti-cinereis. 
Long. tot. 63 unc. ; rostri, 3; ale, 3; caude, 3; tarsi, J, 
Hab. S* Fé de Bogota. 
AGRILORBINUS HUMERALIS. Agr. in toto niger, humeris exceptis, 
his cerulescenti-cinereis. 
Long. tot. 5 unc.; rostri, 7 lin.; ale, 22; caude, 21; tarsi, 1. 
Hab. S“ Fé de Bogota. 
This bird only differs from the preceding species in its smaller 
size. 
AGRILORHINUS OLIVACEUS. Agr. olivaceus, corpore subtis palli- 
diore, et flavido tincto. 
Long. tot. 4 unc.; rostri, $; ale, 2; caude, 2; tarsi, 8. 
Hab. Mexico? 
This specimen is probably a female. 
AGRILORHINUS PERSONATUS. Agr. ceruleus; fronte, spatio circa 
oculos, rostro pedibusque nigris ; remigibus rectricibusque interne 
nigrescentibus. 
Feem. plumbea. 
3 Long. tot. 64 unc. ; rostri, 3; ale, 3; caude, 22; tarsi, 3. 
9 —— 53 oe 2 5, 22; » 28; » Z- 
Hab. S* Fé de Bogota. 
«This bird is about the size of the Blue Bird (Sialia Wilsoni) of 
North America; its blue colouring is much darker, and less brilliant, 
The bill is strong, long, and compressed, and suddenly bent down- 
Ann. & Mag. N. Hist. Vol. vi. Dec. 1840. - 
