428 



U. S. p. R. E. EXP. AND 8DRVEY8 — ZOOLOGY — GENEEAI, REPORT. 



Immature and young specimens are intermediate in color. 



The bill of this species is much more compressed and slenderer than in C. americana 

 wings are more pointed ; the claws larger 



The 

 The white bands on the wing distinguish the two 



in all stages. 



List of specimens. 



AEGIOTHUS, Cab an is. 



Jicanthis, Bonap. Conspectus, 1850, not of Bechstein, 1802, nor Keys. & Blag. 1840. 

 Jlegiothus, Cabanis, Mub. Hein. 1851, 161. Type Frlngilla Unaria, Linn. 



Bill very short, conical, and acutely pointed, the outlines even concave ; the commissure straight; the base of the upper 

 mandible and the nostrils concealed by stiff, appressed bristly feathers ; middle of the mandible having several ridges parallel with 

 the culmen. Inner lateral toe rather the longer, its claw reaching the middle of the middle claw ; the hind toe rather longer, 

 its claw longer than the digital portion. Wings very long, reaching the middle of tlio tail ; second quill a little longer than the 

 first and third. Tail deeply forked. 



The specimens before me do not indicate more than one species, A. Unaria, although the A. 

 canescens of Greenland, in all probability, is found in Northern America. 



Comparative measurements of species. 



AEGIOTHUS LIN ARIA, Cabanis. 



licsser Red Poll. 



Fringilla Unaria, Linn. Syst. Nat. I, 17CG, 322.— Aun. Cm Biog. IV, 1838, 538 ; pi. 375. 



Fringilla {.icanthia) Unaria, Keys. & Blas. Wirb. Europ. 1840, No. 115, page 161. 



Jlcanlhis Unaria, Be. Conspectus, 18.50, 541. 



Jlegiollius Uyiaria, Cabanis, Miih. Hoin. 1851, IGl. 



Unaria minor, Sw. F. l5or. Am. II, 1831, 2G7.— Aun. Syn. 1839, 114.— In. Birds Aincr. Ill, 1841, 122; pi. 179. 



