360 
U. S. P. R. R. EXP. AND SURVEYS — ZOOLOGY— GENERAL REPORT. 
this name described on page 59, and there called likewise Thryothorus arundineus, is the CertMa 
palustris of Wilson. The bird he described in 1807 as " Troglodyte des roseaux," or Troglodytes 
arundinaceus, is as certainly Sylvia ludoviciana of Latham. Vieillot unquestionably knew the 
latter species in 1816, as he had described it in 1807, although its biography of that date 
belonged to the first mentioned bird. For this reason, therefore, in the necessary uncertainty 
of the case, I am inclined to differ from Gray, and to consider the Sylvia ludoviciana as the 
type, especially as the necessity of a new generic name will thereby be avoided. 
Synopsis of species. 
Tail feathers light brown, with bars of black. Superciliary stripe extending far back on the 
neck, and spotted with black. Tail about equal to the wings. 
Lateral tail feather a quarter of an inch shorter than longest. Above, reddish brown ; 
beneath, pale yellowish rusty ; sides plain T. hidovicianus. 
Lateral tail feathers half an inch shorter than longest. Above, reddish brown ; beneath 
bright reddish brown on the sides and behind ; sides obsoletely barred... T. herlandieri. 
Lateral tail feathers black, varied with white. Superciliary stripe confined to the neck. Tail 
longer than the wings T. beioickii. 
Comparative measurements of species. 
Stretch 
of wings. 
Its claw 
alone. 
Bill 
above. 
7113 
10204 
7123 
Thriothorus ludovicianus 
do 
Thriothorus berlandieri . . 
Philadelphia 
South Illinois ... 
Bonuillo 
Thrifflthorusmactilipectus' 
Tlniotliorus hewickii. 
Guatemala. 
Carlisle, Pa. 
Tliriulhoriis leueog 
Troglodytes aedon . 
do 
do 
Cosumnes riv 
Mexico 
Carlisle, Pa.. 
roglodytes parkmanni 
Cape Florida 
do 
Fort Steilacoom.. 
Troglodytes amerieanus. 
Troglodytes hyemalis. ... 
Troglodytes europaeus . 
Cistothorus palustris 
West Northfield, 111 
Nuinberg 
Carlisle, Pa 
5.40 
5.70 
4.80 
5.52 
5.20 
5.25 
5.54 
5.00 
5.50 
5.10 
4.80 
4.50 
4.92 
4.10 
2.34 
2.20 
2.25 
2.16 
2.25 
2.34 
2.18 
2.08 
2.12 
2.00 
2.08 
1.75 
2.04 
2.00 
1.92 
2.06 
2.08 
0.78 
0.76 
0.20 
0.22 
0.64 
0.74 
8.10 
2.12 
0.64 
0.58 
0.63 
0.14 
0.15 
0.16 
0.16 
0.44 
0.54 
0.62 
0.58 
0.16 
0.14 
0.52 
0.42 
0.60 
0.62 
0.66 
2.00 
1.70 
0.72 
0.56 
Thryolhorvs mamlipcctus, I.kfr. Rev. Stool. 1845, 338, 
