TROGLODYTES. 99 
brunnea, mandibula et pedibus corylinis. Long. tota 4:4, ale 2+1, caudwe 1-9, rostri a rictu 0-65, 
tarsi 0-7. (Descr. exempl. ex Jalapa, Mexico. U.S. Nat. Mus. no. 26368.) 
Hab. Nortu America, whole of the United States and part of Canada > ®—Mexico, 
Charco escondido, Tamaulipas (Couch ®), Orizaba (Sumichrast®), Mirador (Sar- 
torius®), Jalapa (de Oca®), 
The differences said to subsist between the races of 7. aedon found in the Eastern 
States, the Western States, and Mexico, called respectively 7. aedon, T. parkmani, and 
T’. aztecus, are of so slight a nature that we do not see how the sort of quasi recog- 
nition that has been accorded to them can be long maintained. These differences are 
concisely stated by Prof. Baird to be as follows :— 
TL. aedon. First primary nearly half the longest; colour above dark brown, 
rufous towards the tail. 
L. aztecus. Wing similar ; above paler brown. 
I’. parkmant. First primary half the second ; above paler brown. 
Of these characters the colour of the plumage above is very variable in intensity, 
and we do not believe it possible to distinguish specimens with any thing approaching 
certainty by this test, 
As regards the length of the first primary, there does not seem to be any appreciable 
difference between any of these races; but the difference of its proportion to the rest 
of the wing is due to western specimens generally having a rather more lengthened 
wing than eastern ones’. But a Florida example does not differ in this respect from 
western birds, though Prof. Baird states the contrary was the case in the specimens 
he examined ; so that here again is no certain test by which to discriminate these races. 
Troglodytes aedon, as we prefer to call all these slight varieties, is a very well-known 
bird in the United States; and its habits and economy are fully set forth in recent 
works on North-American ornithology. Its range in Mexico seems strictly confined 
to the eastern side of the country, where it extends to the environs of Orizaba and 
Jalapa. Further south, in Yucatan and Guatemala, its place is occupied by its close 
ally 7’. intermedius, of which we give an account below. 
As will be seen above, the name this little bird should bear has been much. disputed. 
That of Troglodytes aedon will satisfy perhaps all ornithologists, except those who, with 
_ Dr. Coues, urge the acceptance of the names introduced by Bartram ’. 
2. Troglodytes insularis. 
Troglodytes insularis, Lawr. Ann. Lyc. N. Y. x. p..3 (ex Baird, MS.)', et Mem. Bost. Soc. N. H. ii. 
p. 268°; Grayson, Pr. Bost. Soc. N. H. xiv. p. 299°. 
Supra griseo-murinus, dorso leviter fusco irrorato; alis et cauda fusco-nigro transfasciatis ; subtus albidus, 
crisso vix fusco notato; superciliis elongatis distinctis; rostro et pedibus corylinis, mandibule basi 
13* 
