172 Cincinnati Society of Natural History. 



specimens of both species shows that the chin, or feathered space be- 

 tween the forks of the lower mandible, is considerably wider in cas- 

 tanea than in striata, — arguing a greater width of base of bill in the 

 former species. The bill of cas^anea is generally the larger in everj^ 

 wa3^ but its greater width at the base is especially evident. This 

 character appears to be constant in a number of specimens from this 

 and other localities, and being an anatomical peculiarity, it is, of 

 course, much more reliable as a diagnostic mark than any slight dif- 

 ferences in coloration. 



43. Dendrceca c^rulescens, Baird. — Black-throatea Blue Warbler. 

 — Migrant in May and September. Rather conamon. 



44. Dendrceca virens, Baird. — Black-throated Green Warbler. — 

 Common migrant in May and September — October. 



45. Dendrceca pinus, Baird. — Pine-creeping Warbler. — A rare mi- 

 grant in April. 



46. Dendrceca kirtlandi, Baird. — KirtlancV s Warbler. — A specimen 

 ofthis extremely rare warbler, taken in May, 1872, at Avondale, is 

 now in Mr. Dury's collection. 



47. Dendrceca palmarum, war. palmardm,^ Baird. — Yellow Red-poll 

 Warbler. — Migrant in April and October. Common along hedgerows 

 and fences in the fall. 



48. Dendrceca discolor, Baird. — Prairie Warbler. — A rare migrant 

 in May. 



49. ^SiURUs'^ AURiCAPiLLUs, Bonaparte. — Golden-crowned Thrush or 

 Wagtail. — Common summer resident. April 20th to September 15th. 



50. SiURUS N^vius, Cones. — Small-billed Water Thrush. — A rare 

 migrant in May. 



51. *SiDRUS MoTACiLLA, Bonapartc. — Large-billed Water Thrush. — 

 Summer resident. April 10th to September 1st. 



52. Oporornis acjilis, Baird. — Connecticut Warbler. — One specimen 

 only; May, 1876 {Dury). 



53. fOpoRORNis FORMOsus, Baird. — Kentucky Warbler. — Summer 

 resident. Arrives early in May and remains until September, 



54. *Geothlypis trichas, Cabanis. — 3Iaryland Yellow-throat.— A 

 common summer resident. May 1st to September 15th. 



55. Geothlypis Philadelphia, Baird. — 3fourning Warbler. — A rare 

 migrant in Maj^ (Dury) and August (Shorten). 



1 See Ridgway on " Geographical Variation in Dondra'ca inihnaraia. "—£u/letin of the 

 KuUall Orn. Club. Nov. 1876. 



2 See "Corrections of Nomenclature in the Genus Siurus," Coucs —Bulletin NxMall 

 (9r;j.C;w&, April, 1877, 



