502 



U. S p. E R. EXP. AND SURVEYS — ZOOLOGY — GENERAL REPORT. 



there seems little doubt that the former name cannot he retained for the present group. 

 Passerina of Vieillot, if otherwise apj^licable, is preoccupied in Botany. 



Comparative measurements of species. 



CYANOSPIZA PAKELLINA, B a i r d . 



Cyannloxia parellina, Bonap. Conspectus, 18.50, 502. 



?Pitylus lazulus, Lesson, Rev. Zool. 1842, 174. Speaks of chestnut. 



Sp. Cn. — General color dark bine, almost ukramarine, brightest on the rnnip, les-sor wing coverts and top of head, shading 

 on the hood to whitish blue on the forehead. Sides of head, including lores, and chin, with tail black. A few blue feathers 

 on the lower jaw below the eye. Bill black. Length 5 inches ; wing, 2.50 ; tail, 2.50 ; tarsus, .75 ; bill about .45. 



Hub. — Northeastern Mexico to the Rio Grande. 



The hill of this si^ecies though full and turgid, is not as deep as that of Guiraca coerulea, 

 the lower not larger than the upper. The wing is much rounded ; the fourth quill longest, the 

 third and fiftli little sliorter ; the second and sixth about equal ; the first not longer than the 

 secondaries. In Guiraca coerulea the second is longest, the first rather shorter than the fourth. 

 The tail is nearly even ; very sliglitly emarginate and rounded. 



A specimen received from Mr. Gould lias the bill longer and not so black as that of Lieut. 

 Couch. 



This species connects Cyanospiza with Guiraca, and may possibly be entitled to separate 

 generic rank. 



List of specimens. 



