82 
ZOOLOGICAL LITERATURE. 
and two-thirds the wing ” (qu. longer or shoiiier than ?), the nostrils not so 
much doubly perforate, as with one large oval aperture, divided by a nearly 
horizontal septum, which sliows in the aperture without being united to the 
anterior margin. The tarsal scales sometimes distinct, sometimes fused. 
S. F. Baird, Eev. Am. Birds, pp. 114, 115. 
Thryophilus is a new genus instituted for a group of species which have 
before been classed with Thryothorus. The hills of the two are the same, 
but that of the new genus is more notched, nostrils imperforate, and wanting 
the overhanging membranous scale of Thryothorus. No type is assigned to 
the genus, hut Thryothorus rufalhus stands first in the species enumerated, 
S. F. Baird, Rev. Am. Birds, pp. 93-134. 
Thryophilus rufalhus from Panama and New Granada diflers from a 
specimen received from Guatemala in having a whiter belly, sides washed 
Avith red, the black tail-hands being half as wide as the intervals between 
them, while in the Guatemalan bird the belly is ashy-white, the sides are 
without any tinge of red, and the black tail-hands are narrower. This latter 
is separated as a variety under the name of poliopleura. T. sinaloa is described 
as a new species from North-western Mexico. It is smaller than T. rufalhus., 
and is greyish above instead of cinnamon-red \ it differs also from the other 
species of the gTOup. S. F. Baird, Rev. Am. Birds, pp. 128-130. 
Troglodytes aedon^ from Eastern Mexico, appears to differ slightly from 
northern specimens, being paler above, and possibly rather smaller, and is 
distinguished as var. aztecus. Examples also of T. hycmalis from the western 
coast of the United States are considerably darker above tlian those obtained 
in the e^t. They also have little or none of the whitish spotting among 
the dusky bars, the under parts are more rufous, the tarsi shorter and 
the claws larger. Hence they are distinguished as var. paci/icus. In like 
manner eastern specimens of Cistothorus palustris have shorter bills and more 
obsolete markings than western ones. These are distinguished as var. palu- 
dicola. S. F. Baird, Rev. Am. Birds, pp. 139, 140, 145 and 148. 
Ti'oglodytes inquietus is described as a new species from Panama. It was 
at first considered by Mr. Lawrence (Ann. Lyc. N. York, vii. p. 320) to be 
the same as 2\ hypa'edon, but it is larger with longer bill and legs. The colours 
beneath are paler, the lower part of the sides distinctly barred, the upper parts 
considerably greyer. S. F. Baird, Rev. Am. Birds, p, 143. {Cf. P. L. Sclater 
and O. Salvin, P. Z. S. 1864, p. 346.) 
Thryothorus petenicus of Salvin (P. Z. S. 1863, p. 187) agrees almost exactly 
in size and proportions with Troglodytes alhinueha of Cabot (Proc. Boston N. 
II. Soc. ii. p. 258), being only a very little smaller. The coloration and mark- 
ings are precisely similar, the only difference being in the tail, which is not 
incompatible with the identity of the two birds. S. F, Baird, Rev. Am. 
Birds, pp. 149, 150. 
Thryothorus atrogtdaris and T. thoracicus are two new species from Costa 
Rica. The former somewhat resembles 7. coray a, but has a loiif? strong bill 
and a black throaty the latter T. maculipectus, but has barred wings, distinct 
markings on the throat and breast, and a stronger bill. Its place seems to be 
near T. pleurostictus j and both these new species belong to the section Pheut/o~ 
pedius. O. Salvin, P. Z. S. 1864, p. 580. 
