11 
a white end. They are considerably larger than the horns of the 
usual species. 
In the Cabrit or Antilocapra Americana, the horns are thick, 
rounded on each edge and produced into a compressed submedial 
frontal process, which is gradually bent towards the inner side. The 
tips of the horns are rounded, becoming nearly cylindrical, and 
are gradually and regularly arched backwards and inwards with a 
bluntish extreme end. 
The horns of the genus are peculiar for being lined internally with 
a close velvety coat of short hair, directed towards the tip of the 
cavity; and the whole outer surface of the horn appears to be formed 
of agglutinated hair, some separate hairs being seen on the surface. 
The peculiarity in the internal structure of the substance of the 
horns of this genus shows, like the branched external form, a simi- 
larity to the horns of the Deer; the hairy horn being the analogue 
of the deciduous velvet of the Deer, and the permanent hairy coat of 
the Giraffe. The ring of hair round the base of the outer surface is 
to be observed equally developed in the horn from Lord Derby’s 
Collection and in that of the common Prongbuck. 
4. ON THE Genus CuLICIvVoRA or SWAINSON, AND ITS COM- 
PONENT SPECIES. By Puitip Lutiey Scuater, M.A., F.Z.S. 
The genus Culicivora (as established by Mr. Swainson in the 
Zoological Journal for 1827) has the Muscicapa stenura of Temminck 
for its type, but embraces also the Muscicapa cerulea of Wilson and 
its affines. Now these birds belong in reality to two very different 
groups; the M. stenura being a Tyrannine, while the M. cerulea 
can hardly be placed within the limits of that family, but must be 
arranged either with the old-world Muscicapines (as in Bonaparte’s 
Conspectus) or with the Sylvians (as in Gray’s Genera of Birds). 
Dr. Cabanis in his Ornithologische Notizen, in Wiegmann’s Archiv, 
has rightly separated these two forms, but has unfortunately chosen 
to call the M. cerulea and its allies Culicivora, and made a new name 
Hapalura for the M. stenura—the true Culicivora of Swainson. 
Under these circumstances Hapalura is a mere useless synonym 
of Culicivora, Sw., and a new name is required for the group con- 
taining M. cerulea, and commonly known as Culicivora. I therefore 
propose for it the term Polioptila, from the general grey colouring 
of the plumage. 
The species of this genus that I am at present acquainted with are 
the following :— 
1. Poxioprita CHRULEA (Linn.). 
Motacilla cerulea, Linn. Muscicapa cerulea, Wils. Am. Orn. ii. 
p- 164. pl. 18. fig. 5; Audub. pl. 84 3 & 9. 
3 Ceruleo-cinerea, fronte et superciliis nigris: subtus cerules- 
centi-alba, rectricibus extimis albis. 
$ Mari similis, sed linea superciliari et frontali nulla. 
Hab. United States, Texas, and Mexico. 
