BIRDS OF NORTH AND MIDDLE AMERICA. 391 



KEY TO THE SPECIES OF RHYNCHOCYCLUS. 



a. Throat yellow (gamboge or wax yellow); supraloral si reak saffron yellow. (Colom- 

 bia to Guiana and Brazil.) Rhynchocyclus flaviventris (extralimital) « 



aa. Throat pale grayish, or at most only tinged with olive-yellow; supraloral streak 

 white. 

 h. Grayish of throat not extending to chest, and strongly tinged with pale olive- 

 yellow. 

 c. Larger (wing not less than GO, tail more than 50 mm.). 



(/. Darker, th(> pileum and hindneck deep slate color, faintly tinged with olive- 

 green, the chest and sides deeper olive-greenish. (Brazil.) 



Rhynchocyclus scotius (extralimital)^ 



dd. Paler, the pilemn and hindneck lighter slate color or slate-gray, strongly 



tinged with olive-green, the chest and sides paler olive-greenish. 



e. Larger (wing 66-68, tail 57-60 mm.); coloration slightly darker, with 



pileum more grayish. (Southern Brazil, Paraguay, etc., to Colombia.) 



Rhynchocyclus sulphurescens (extralimital) c 



ee. Smaller (wing 61-64, tail 53-56 mm.); coloration slightly paler, with 



pileum more olive-green. (Panama.) 



Rhynchocyclus flavo-oUvaceus (p. 891) 

 C.C. Smaller (wing 52, tail 44 mm.). (Venezuela; northern Brazil?.) 



Rhynchocyclus assimilis ? (extralimital) d 

 hh. Grayish df throat extending over chest, not strongly, if at all, tinged with olive- 

 yellow. 

 c. Pileum and hindneck nrucli darker gray; back, etc., less yellowish olive-green; 

 greater wing-coverts very broadly edged with cleai' sulphur or primrose y-' How, 

 andmiddlecovertsbroadly tipped with same. (Panama; Costa Rica?) 



Rhynchocyclus marginatus (jd. 392) 



cc. Pileum and hindneck much paler gray; back, etc., more yellowish olive-green; 



greater wing-coverts edged (not conspicuously) witli yellowish olive-green. 



(Southern Mexico to Costa Rica.) Rhynchocyclus cinereiceps (p. 394) 



RHYNCHOCYCLUS FLAVO-OLIVACEUS Lawrence. 

 YELLOW-OLIVE FLYCATCHER. 



Adult male. — Pileum and hindnock between olive-green and mouse- 

 gray but nearer the former; back, scapulars, rump, upper tail-coverts 

 and lesser wing-coverts bright olive-green; wings dusky with j^ellow- 

 ish olive-green edgings, these broader and pure sulphur or primrose 



« if [iiscipeto] flaviventris Maxmilian, Beitr. Natiirg. Bras., iii, 1831, 929 (Brazil; 

 cites ? Platyrynchos flaviventer Spix, Av. Bras., ii, 32, pi. 15, fig. 1). — R\hynchocylus] 

 flaviventris Cabanis and Heine, Mus. Hein, ii, 1859, 56 (Bahia). — Rhynchocyclus 

 flaviventris Sclater, Cat. Am. Birds, 1862, 221; Cat. Birds Brit. Mus.. xiv, 1888. 171.— 

 Tiyrannida] flaviventris Lichtenstein, Verz. Doul>l., 1823, 50. — \CycJorhynrh)is\ flavi- 

 venter Bonaparte, Consp. Av., i, 1850, 187. 



6 Rhynchocyclus scotius Oberholser, Proc. TT. S. Nat. Mus., xxv. No. 1276, Aug. 30, 

 1902, 63 (Brazil; coll. U. S. Nat. Mus.). 



e riatyrhynchus sulphurescens Spix, Av. Bras., ii, 1825, 10, pi. 12, fig. 1 (Rio de Ja- 

 neiro, Brazil). — Cyclovhynchus sulphurescens Cabanis, in Wiegmann's Archiv. fur 

 Naturg., 1847, i, 249. — R[hynchocyclus] sulphurescens Cabanis and Heine, Mus. Hein., 

 ii, Sept., 1859, 56, footnote (Brazil); Sclater, Cat. Birds Brit. Mus., xiv, 1888, 168, 

 part. — Platyrhynchus nuchalis Maximilian, Beitr. Natiirg. Bras., iii 1831, 971. — Cyclo- 

 rhynchus nuchalis Burmeist(>r, Syst. Ueb. Th. Bras., ii, 1856, 503. 



d [?] Rhynchocyclus assimilis Pelzeln, Orn. Bras., ii, 1869, 181 (Engenho do Gama, 

 S. Vicente, Borba, Rio Negro, and Barra do Rio Negro, n. Brazil; coll. Vienna Mus.). 



I have not seen a specimen authoritatively identified as i?. assimilis, the one doubt- 

 fidlv so idenlified bv me being from Venezuela. 



