TERETRISTIS. 233 
1st and longest primaries, .50; length of bill from forehead, .60, from nostril, 
.37; along gape, .61; tarsus, .80; middle toe and claw, .66; claw alone, .20; 
hind toe and claw, .45 ; claw alone, .21. 
This beautiful and hitherto undescribed species is quite similar to 
G. venustus in appearance, but differs in a much longer, broader, 
and more rounder tail. The wing is much graduated; the 4th and 
5th quills nearly equal; the 3d a little shorter; the 2d about equal 
to the 7th; the 1st shorter than the secondaries. The principal 
difference in coloration consists in the absence of the black pectoral 
collar (although a few concealed spots may be considered as repre- 
senting it); in the pure white of the sides of the breast, instead of 
plumbeous ; in the narrow whitish bands across the wings; the 
greater amount of white on the tail, ete. From pelzelnii it is distin- 
guished by the plumbeous crown and white tips of the tail feathers. 
This bird is one of a number of new species discovered, during 
the past winter, by Col. Grayson, on one of the Three Marias, a 
group of Islands off the coast of Mexico, about eighty miles from 
San Blas; and I cannot more appropriately dedicate it than to Mrs. 
Grayson, to whose encouragement Col. Grayson owes so much of the 
persistency and success with which he has prosecuted the study of 
the ornithology of California and western Mexico. 
Smith-|Collec-| Sex When 
sonian| tor’s | and Locality. @alvented Received from Remarks, 
No. No. Age. : 
37,312 67 fof Three Marias, Mex. | Jan. 1865, | Col. A.J. Grayson. | ‘Iris brown.” °* 
87,313 70 |g Juv. sé ans ss .... [Type. 
37,314 | 69 | Q “ ne “ ge 
TERETRISTIS, Casanis. (¢ 
Terettistis, Casanis, Jour. Orn. III, 1855, 475. (Type Anabates fernan- 
dine, LeMs.) 
Bill slender, rather deep and compressed from the base, not quite so long 
as the head; the outlines of upper mandible considerably decurved, and 
without notch at tip; the gonys straight. Rictal bristles short and incon- 
spicuous, not reaching the nostrils. Some scattered bristles in the chin. 
Nostrils rather elongated, without membrane above them anteriorly, the frontal 
feathers coming up close. Wings shorter than the slightly rounded ,tail. 
First quill shorter than outer secondaries ; 2d about equal to 7th; 3d and 4th 
equal and longest. Tail slightly graduated, the feathers acuminate. Inner 
toe with basal joint cleft rather more than half; tarsi short, but little longer 
than middle toe and claw; the scutelle distinct, or else fused on the outside ; 
claws short, considerably curved. Sexes similar. No spots on the tail. 
This is another genus the precise position of which is somewhat 
