136 
THE ARROW-HEADED WARBLER. 
THE ARROW-HEADED WARBLER, OF JAMAICA. 
DENDROICA PHARETRA. 
The arrow-headed warbler, Dendroica pharetra, which is figured 
on Plate IX, was described by Philip L. Gosse, in 1847 in his “Birds of 
Jamaica”, page 163. This representative of the large family of Amer- 
ican warblers, confined as it is in habitat to the island of Jamaica, 
appears to be quite rare in collections. It does not seem to be very com- 
mon even on its native island, and Mr. Gosse met with but one spec- 
imen, which he captured on the top of Bluefields Peak, on the 6th of 
February. He observed nothing characteristic in the habits of this indi- 
vidual. My own experience with the living species is limited to seeing 
two on a steep mountain side, near Kingston They were searching 
for food among the low branches of the surrounding woodland, in the 
manner of their kindred, and after giving me a moment’s opportunity 
to observe them, they disappeared in the intricacies of the luxuriant fo- 
liage, while I pursued my way upward; so we parted, none of us worse 
off for the encounter. I heard no song, nor did I ever see a description 
of it. In fact, I believe that the complete history of these denizens of 
one of the fairest islands that the sun ever shown upon, remains to be 
written. 
THE NICTITATING MEMBRANE 
AND CRYSTALLINE LENS IN THE MOTTLED OWL. 
In the mottled owl Megascops asio, the nictitating membrane, or 
third eyelid, is exceedingly well developed, most admirably illustrating 
the method of opening it. The ac- 
comp tning cuts are a little smaller 
than life. 
A Fig. 35, A. shows the nictitating 
membrane partly covering the pu- 
Q pil v. and iris, o. It is drawn over 
the eye by a muscle attached to the 
lower corner, see Fig 35, A, Q, pass- 
jiff Jp E « E ing down the side, Fig. 3d, B, Q. uv- 
M er the convexity of the lower surface, 
m ib. q % around the optic nerve, o, 
q to terminate in the fl it, triangular, 
Fig. 34. Fig. 35. contractile body, ib. A, x. In pass- 
