6 Cincinnati Society, of ISTatural 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 castanea is generally the larger in every 

 way, 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 cjjrulescens, BsArA.—Black-throatea Blue Warbler. 

 —Migrant in May and September. Rather common. 



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

 Common migrant in May and September — October. 



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

 grant in April. 



46. Dendrceca KraxLANDi, Baird. — KirtlanWs Warbler. — A specimen 

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

 now in Mr. Dury's collection. 



47. Dendrceca palmarum, i;ar. palmarum,^ Baird. — Yellow Bed-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.ffi;vius, Cones. — Small-billed Water Thrush. — A rare, 

 migrant in May. 



51. *SiDRDS MOTACiLLA, Bonaparte. — Large-billed Water Thrush. — 

 Summer resident. April 10th to September Ist. 



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

 only; May, 1876 {Dury). 



53. f Oporornis formosus, Baird. — Kentucky Warbler. — Summer 

 resident. Arrives early in May and remains until September. 



54. *Geothltpis trichas, Cabanis. — Maryland Yellow-throat. A 



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



55. Geothlypis Philadelphia, Baird. — Mourning Warbler. A rare 



migrant in May [Dury) and August {Shorten). 



1 See Ridgway on " Geographical Variation in Dendroeoa palmarum."— ^«iie<m of the 

 Jfuttall Om. Club. Nov. 1876. 



2 See "Corrections of Nomenclature in the Genus Siurus," Cones —bulletin Nuttall 

 Orn.Clwi, April, 1877, 



