SYLVICOLID.E — THE WARBLERS. 295 



A nest of this bird from Chester County, Penn., is a very flat structure, 

 evidently built in a bed of fallen leaves. It has a diameter of six inches and 

 a height of only two. The cup is a mere depression only half an inch in 

 depth. Its base is loosely constructed of dried leaves, upon which is inter- 

 woven a coarse lining of long, dry, and wiry rootlets and stems of jjlants. 

 It was given to Mr. J. P. Norris, from whom I received it, and it is mm in 

 the Boston collection. 



Mr. Pioliert Eidgway furnishes the following valuable information in regard 

 to the abundance and general habits of this species as observed in »Soiithern 

 Illinois : " It is a very common summer bird in Southern Illinois, where it 

 arrives in the AVabash Valley towards the last of April. It is a wood-loving 

 species, and of terrestrial habits, like the Sciurus aurociqnllus, but generally fre- 

 quents rather different situations from the latter bird, liking better the under- 

 growth of ' bottom ' woods than that of dry forests. In all its mannere it 

 closely resembles the Seiv.7-i, especially the two aquatic species, ludovicianas 

 and noveboracensis, having the same tilting motion of the body, and horizontal 

 attitude when perching, so characteristic of these birds. The nest 1 have 

 never found, thougli well aware of its actual situation. I knew of one some- 

 where among the ' top ' of a fallen tree, but it was so well concealed that 

 the closest search did not enable me to discover it. In mo.st cases the nest is 

 probably on the ground, among the rubbish of fallen tree-to^js, or low brush- 

 wood. 



"The usual note nf this "Warljler is a sharp fxJiiji, almost precisely like that 

 of the Pewee [Sai/ornw fuscus), uttered as the bird perches on a twig near the 

 ground, continually tilting its body, or is changed into a sharp rapid twitter 

 as one chases another through the thicket. Their song is very pretty, con- 

 sisting of a fine whistle, delivered A'ery much in the style of the Cardinal 

 Grosbeak {Cardinal Is xirginiaiuis), though finer in tone, and weaker.'' 



Dr. Coues found this Warbler rare at Washington, and chiefly in low 

 •woods with tliick undergrowth, and in ravines. They were very silent, but 

 not shy, and a few l)reed there. 



Section G EOT HLYPE/E. 

 Genus GEOTHLYPIS, C.vb.vn. 



Tricha.i, Swainsox, Zniil. .Tourn. Ill, .luly, 1827, 167 (not of Gloger, March, 1827, cinial to 



Criniger, Temm.). 

 Gcnthlypw, C.\BA>;is, Wiegmann's Arc-liiv, 1847, i, 316, 349. — Ie. Schomburgk's Eeise, 



Guiana, 1848. 



Ges. Char. Bill .sylvicoline, i-ather depressed, and distinctly notclied ; rictal bristles ycry 

 .'hort or wanting. AVings short, rounded, scarcely longer than the tail; the first quill 

 shorter than the fourth. Tail long; much rounded or graduated. Legs stout; tarsi elon- 

 gated, as long as the head. Oliye-green aboye, belly yellow. Tail-feathors immaculate. 

 Legs yellow. 



