340 NOUTII AMKUK'AN illUDS. 



Ims a lun<;i'r tarstis and a (lilltniit style of t'oloration. The species are dis- 

 tiiij^uisliL'd as I'ollows : — 



8. nigricans. Sooty Idaick ; alMloim-ii aii<l r<lgo of outer web of hiteral 

 lail-li'Jillicr ji'uc wliite. , 



a. Li)\vt'r Uui-coverts imro white. 



Greater win<,'-coverts paler toward tips of outer webs. Wing, 

 3.00; tail, 0.4.'). Hub. Tacilic I'roviiiee, liiited States, and Mex- 

 i<"0 .......... var. nigrirnnx, 



b. Lowi'r tail-coverts blaokish. 



Greater coverts not appreciably paler at emls. Wing, 3.35; tail, 

 o..'><). Ilab. Middle America, north of Panama . xar. aquat icns} 



Both rows of wintr-coverts distinctly tipped with white ; white 



edgings of secondaries very conspicuous. Wing, 3.35 ; tail, l' .30. 



Jlah. New Granada; Venezuela . . . var. cine rnnc ens? 



8. fuBCUS. Grayish-olive above, and on sides of breast; beneath (including 



throat) white, tinged with sulphur-yellow. Wing, 3.40; tail, 3.20. llah. 



Eastern Province United States ; Eastern Mexico. 



8. sayus. firownish-ashy, tlie tail and upper tail-coverts black ; abdomen 

 and crissuni deep ochraceous. Hub. Western Province of United States, 

 and whole of Mexico. 



Sayomis nigricans, Boxap. 



BLACK PEWEE. 



Tijrannula vlfjrkans^ Swaix.sox, Syn. lUrds Mex. Taylor's Phil. Mag. I, 1827, 367. — 

 NF.AVDi:itKY, Zoul. C'al. & Or. Route, Rep. P. R. R. Surv. VI, iv, 1857, 81. Mmcicapa 

 viijricnvs, Ai'i>. Orn. Biog. V, 1839, 302, pi. cccclxxiv. — Ib. Birds Am. I, 1840, 

 218, pi. Ix. Ti/rarnus nitjricam, Nittall, Man. I, ^2(1 od.,) 1840, 326. Mi/iobius 

 n>\ira'inis, GiiAY. Mi/iarchus )ii'frk-(nis, Caijanis, Tschudi Fauna Pt-ruan. 1844-46, 

 1 r)o (Peru). Saf/omis ni(jrkanii, PoXAr. ('omptes Rendus XXVIII, 1S.')4, not»'s Orn. 

 87. — lUi:-!., Birds N.Am. 18r.8, 183. — IIef.um. X, S, 38. — Coopku, Orn. Cal. I, 

 1870, 319. Aulanax nigrkans, Cabaxis, Cab. Joum. fiir Ornith. IV, Jan. 1856, 2 

 (type of genus). — Ib. M. H. II, 68. Muacka^a scmiutra. Vigors, Zotil. Beechey 

 Voy. 1839, 17. 



* Smjoniis nifjrkans, var. aquatkna. Sayorais aqwitkus, Sclatei; & Salvix, Ibis, 1859, 

 p. 119 (Ouateniala). 



- Siti/oruis )ti(jric'ins, var. cincrarcnft. Sfnjornis clncracca, Lafr. Rov. Zoiil. 1848, p. 8. — 

 S( L. fatal. Am. Birds, 1S62, 200. The above races are clearly sliown to be merely modiHeations, 

 with latitude, of one type, by the series of sjK-eimens before us. Thus, .sj)ecimei)s of S. m'ljri- 

 aitis fn«ni On;^aba show more or less dusky on the lower tail-coverts, while in more northern 

 s]H>eimens (i. e. typical var. vigrkan.s) there is not a trace of it. Tyjiical specimens of aquafkus, 

 from Guatemala, show merely a more advanced melanism, the lighter markings on the wings 

 Wcoming greatly restricted ; there is still, however, a decided presence of white on the lower 

 tail-coverts. Specimens from Costa Rica (typical nquatkus) exhiliit the maxinnim degree of 

 melanism, the white beneath being confined to a central sjHjt on the abdomen. In cineraceus 

 (from New Granada) the white l)eneath is similarly restricted, but on the wings is very con- 

 spicuous, showing a reversion back to the character of nigricans, though surpassing the latter 

 in the amount of white on the coverts and secon«iaries. 



The .S'. latirostris (Anhnuu- 1. Cab. k Hf.ix. Mus. Ilein. ii, p. 68 ; Saiiornis I. Srr„ Cat. Am. 

 B. 1862, 200), from Ecuador, we have not seen. It is probably also rcferrible to the same type. 



