J\Wn'>// — Xanu's of Crrfdin North Aiiirr/ni h llird.^. 125 



to lie ;i ('(instnnt incrcasr in size to tlic iioi-tlici'ii pnrt of tlic 

 liinls" range. 



Till' typical form of ('iil'i(nlf--< inirn differs from llie nortliern 

 l)inl in smaller sizi' ; narrower and less wvW marked ln'own hor- 

 clers to the feathers of the hack (thehrown horder sometimes 

 entirely lacking). The color of the npp a* side of the shafts 

 of the i)i'iuiaries ( hrown when freshly monlte(l) soon Meachesto 

 an old ivoiy, or yellowish white. 



Cot]iiiit('s (luro st'iifciilrioiKili--^ (Hffers from tlie typical form in 

 larger size ; more pronounced hrown horders to the feathers of 

 the npp;n-parts, and the nppia- si(U' of the shafts of the jirimaries 

 usually remain permanently dusky I)ro\vn. 



The following measurements give an idea of the ditferences in 

 size l)etween the two forms. 

 Co III Kites ((lira : 



Male (?), near city of Vera Cruz, Mexico. (Type of C. 

 hiirrorlidKix). Wing, 47-") ; tail, 215 ; tarsus, (VI. 



Female, Southern Vera Cruz (April 7, 1901, Bangs Coll.). 

 Wing, 475 ; tail, '2'oS ; tarsus, G;>. 

 Cdtliiirtcs ((lira scpfeiifrioiialis: 



Male, Washington, I). C. (Dec. 25.) Wing, on^ ; tail, o2U ; 

 tarsus, 74.5. 



Male, Mt. Carmel, 111. (Aug. 1.) Wing, 550 ; tail, ;520 ; tar- 

 sus, 67. 



Tangavius involucratus Lesson. 



In the Revue Zoologique for Fehruary, 1839, p. 41, L(\sson 

 descrihes Tain/acUis ii(rolucrati(.s from a Mexican specimen in the 

 Alxnlle Collection as follows : "7*. corpore nigi'o friiooqvc ; alis, 

 ct (■((iiila ((frdcurnlcscciitc xplciKlciitiJuis ; coU! jiliniiis^ ((iiiplis, dlla- 

 l((t( (iiriil iii-riiiii /(iniia iitiliiis.^' This di'scription eviilently applies 

 to a foian of ('allot/irns, and since numenjus other new Kirds 

 descriljcd from the Aheille Collection ahout the same time were 

 from eastern Mexico it is fair to infer that the present species came 

 from the same region, lioth generic and specific names appear 

 to he used for the first time in the place quoted al)ove ; Callothrus 

 of Cassin, iSlid, is thus antedated hy 7>n((/rn;/((.s of Lesson , 1889, 

 and iiiroliicratiis replaces (vbastits for the name of the hird of 

 eastern Mexico. 



