164 go. S. P. R. R. EXP. AND SURVEYS—ZOOLOGY—GENERAL REPORT. 
Sub-Family PSARINAE. 
The characters of this sub-family have already been sufficiently indicated in the preceding 
pages to distinguish it among the other Colopteridae. The genera have been variously given 
by different authors. Cabanis and Burmeister adopt three, Psaris, Pachyrhamphus, and 
Bathmidurus, while Sclater, in a recent monograph of the sub-family, (Proceedings Zool. Soc. 
1857, 67,) recognizes only the two first as genera, giving Bathmidurus and other groups as 
sub-genera. Judging from the North Mexican species before me, however, there appears 
abundant reason for keeping Pachyrhamphus and Bathmidurus distinct. These are readily 
characterized and distinguished by the slightly rounded tail, with broad feathers of the first men- 
tioned genus, the second having the tail much graduated. Both differ from Psaris (or Tityra) in 
having the sexes dissimilar; in having bristles at the base of the bill; the lores well covered ; 
the second abbreviated quill in the male broad and notched at tip, instead of narrow and falcate. 
PACHYRHAMPHUS, G. R. Gray. 
Pachyrhynchus, Sprx, Av. Bras. II, 1824, 31. (Pre-occupied in botany.) 
Pachyrhamphus, G. R. Gray, List Genera, 1838. 
Head crested. Bill a little broader than high just behind the nostrils. Rictus with rather long bristles, two-thirds 
the length of culmen. Posterior portion of tarsus covered with polygonal plates, largest on the sides ; naked inside at the upper 
_end. First primary shorter than the sixth ; second (in the male only) about two-thirds as wide as the first ; emarginated inside 
near the end, where it runs out in an acute point. Tail moderately rounded ; the feathers broad. 
I have constructed the generic characters as given above entirely from a single species, P. 
aglaiae, but they probably apply equally well to all. The bill is strong ; the culmen distinct ; 
the bill moderately broad ; the rictal bristles long. The difference in length between the longest 
and shortest tail feather amounts to but about .15 of an inch. The legs do not show the scutella- 
tion very clearly, but there appear to be a row of large polygonal scales on each side the posterior 
half of the tarsus, separated by smaller ones behind, these scales inferiorly being granular and 
set in naked skin, while the superior portion of the inner face of the tarsus appears to be naked. 
This genus differs from Psaris or Tityra in the broader bill, bristled rictus, feathered lores, 
longer tail, different second primary, &c. 
But one species has hitherto been detected near the limits of the United States; the others 
belong to more southern localities. 
PACHYRHAMPHUS AGLAIAH, Lafresnaye. 
Rose-throated Flycatcher. 
Pachyrhamphus aglaiae, Larresnaye, Rey. Zool. 1839, 98.—Scxarter, Pr. Zool. Soc. 1856, 297,—Is. 1857, 74. 
Psaris aglaiae, Kaur, Pr. Zool. Soc. 1851, 46. 
Sp. Cu.—Fourth quill longest; first about equal to the sixth. Tail rounded. Head crested. Above dark plumbeous, becoming 
lighter to the tail, Top and sides of head with the crest, glossy black ; the forehead tinged with brown. Beneath pale ash, 
tinged with brownish white on the abdomen and crissum. Chin ashy white. Central region of the throat and forepart of breast 
rose color. Cheeks dark ash, tinged with purple. Scapular feathers white at the base. Wings and tail dark brown, edged 
externally like the back ; the outer primaries and secondaries edged with whitish, the former with a white spot at the base. 
Length, 7.50; wing, 3.75 ; tail, 3.10. 
Hab.—Mexico to Rio Grande. 
This species, according to Mr. Sclater, (to whom I am indebted for the identification of the 
present specimens,) is closely allied to P. pectoralis of Cayenne and New Grenada, and P. 
