NATURAL SCIENCES OF PHILADELPHIA. 



191 



1. Much the largest; length about 9 inches, wing (average) 5-25. 



Crown much darker than the hind neck, the transition abrupt. 

 Cbin immaculate. Edgings of feathers on upper parts light 

 chestnut-red, not making indentations towards the shaft. Suf- 

 fusion on jugulum very deep, the streaks narrow, distinct. 

 Central tail feathers long, pointed, much projecting. Bill and 

 legs dusky green, moculaia. 



2. Smaller ; length 7-25 inches, wing 4*8. Crown not conspicuously 



darker than hind neck. Edgings of feathers on upper parts 

 light reddish yellow, scarcely brighter on the scapulars, making 

 indentations towards the shaft. Suffusion on jugulam very 

 light, the markings rounded, somewhat obsolete. Central tail 

 feathers rounded, less projecting. Bill and legs black, Bairdii. 



3. Much the smallest; a miniature of the preceding; length 5-75; 



wing 3-4. Edges of feathers chestnut-red, usually more or 



less indented, tips lighter. Bill black, legs dusky green, minutilla. 



Ueteropygia, Coues. 

 E. Jugulum without an ashy or brownish suflFusion. Upper tail coverts white. 



4. Length 7-5. Jugulum thickly streaked with rather narrow 



lines. Upper tail coverts immaculate, except the outer pair. 

 Central tail feathers nearly black, considerably projecting, Bonapartei. 

 f). Much larger; length 9-5. Jugulum with sparse, rather broad 

 oval spots or streaks. Upper tail coverts with sagittate spots 

 of dusky. Central tail feathers scarcely darker than the late- 

 ral, projecting but little, Cooperi. 



Comparative Measurements of Species. 



AcTODROMAS (AcTODROMAs) MINUTILLA (Vieill.) Coucs. — Least Sandpiper. 



Tringa minutilla^ Vieillot, Nouv. Diet. 1819, xxxiv. 452, (baud dubie.) "Vieill," 



Gray, Genera, 1849, iii. 579. 

 Tringa pusilla^ Wilson, Am. Orn. 1813, v. 32, tab. xxxvii. fig. 4; id. Ord. Ed. 



1829, iii. 134; id. Brewer, Ed. 1840, 347, fig. 161. (Nee Linnsei ; nee 



Meyer; nee Bechst.) Swainson, F. B. A. 1831, ii. 386. Audubon, Orn. 



Biog. 1838, iv. 320, tab. 180; id. Syn. 1839, 237; id. Birds Amer. v. 1842, 



•The measurements of the length and extent are from the fresh bird, and on the 

 authority of the collector. 



1861.] 



