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ART. XXIY .—Descriptions of new species of the Genera Micrastur, G. R. Gray, 

 Tanagra, Linn., and Sycobius, VieiU. Bv John Cassin. 



MICRASTUR, G. R. Gray. 

 PI. 40. 



M. GUERILLA, nobis.* 9 ad.? Capite, cauda, alis totoque corpore supra umbrinis, saturiore in capite. 

 Gula, collo antico, abdomine, crissoque albis, maculis aut lineis nonnullis fuscis in crisso, semitorque 

 alba angusta in cervice, plumis apice fuscis. Plumis pectoris, hypochondriorum et tibiarum albis, 

 fasciis tribus vel quatuor fuscis ; tetricibus cauds superioribus maculis parvis nonnullis albis. Cauda, 

 apice et fasciis quatuor vel quinque angustis, albis. 



Long. tot. (exuvite) a rostri apice usque ad finem caudjE 15 poll., als 7, caudae 6^ pollices. 



Hob. Jalapa, Mexico. 



■ 9 adult 1 Upper surface of the body, head, wings and tail umber or hair brown, darkest on the head. 

 Cheek brown, a few feathers of which color advance upon the neck in front, forming a partial collar. 

 Neck behind with a narrow collar of white, all the feathers of which are tipped or edged with brown. 

 Throat, fore neck, abdomen and under tail coverts white, with a few brown spots or bars on the latter. 

 Breast, flanks and thighs, white, every feather having about three or four bands of brown. Edge of 

 the wing at the flexure and inner wing coverts white with a few crescent shaped spots of brown. All 

 the quills with broad white bars on their inner webs, fifth primary longest. Upper tail coverts with 

 a few white spots. Tail with four or five narrow white bars and tipped with white.^ 



Total length (of skin) from tip of bill to end of tail about 15 inches, wing 7, tail 6i inches. 

 % young ? Under parts slightly tinged with fulvous or buff. Breast, flanks and thighs with the bands 

 narrower, and the throat with a more decided brown collar. A few superciliary feathers white, 

 tipped with brown. Back and wing coverts with ferruginous and white spots. Upper tail coverts 

 with the white spots more numerous. 



Total length (of skin) from tip of bill to end of tail about li inches, wing 61, tail 6 inches. 



Hah. Jalapa, Mexico. 



This species resembles some stages of plumage of the M. xantlio thorax, (Cuv.) and 

 the M. leucauchen, (Temra.) PI. col. 92, 306. It may readily be distinguished from 

 either of those by the absence of the handsome rufous chestnut color of the breast 

 and back, which prevails in all the specimens I have seen of them, and also by the 

 broader and much lesser number of the bands upon the feathers of the under surface 

 of the body. 



*From " Catalogue of Birds collected by Mr. William S. Pease, during the march of the Army of the United 

 Slates from Vera Cruz to the city of Mexico." Proc. Acad. Nat. Sci., Philada.. Vol. iv. p. 87, October, 1848. 



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