EHYNCHOCTCLUS. 9 



similar range in altitude in Costa Eica and the more western parts of the State of 

 Panama. 



The nest of B. brevirosfris has not been discovered ; but Salmon describes the eggs 

 of B. fulvipectus, which he met with at Erontino, in the valley of the Atrato, as white 

 with an indistinct zone of small, very pale-red spots. 



2. Rhyncliocyclus sequinoctialis. 



Cyclorhynchus aquinoctialis, Scl. P. Z. S. 1858, p. 70 \ 



Rhynchocyclus mquinoctialis, Cab. & Heine, Mus. Hein. ii. p. 56 ^ j Lawr. Ann. Lye. N. Y. vii. 



p. 473 ' ; Scl. & Salv. P. Z. S. 1864, p. 359 ' ; Scl. Cat. Birds Brit. Mus. xiv. p. 166 '. 

 Cydwhynchus brevirostris, Lawr. Ann. Lye. N. Y. vii. p. 329 (nee Scl.)° j Cassin, Pr. Ac. Phil. 1860, 



p. 144'. 



Prsecedenti similis, alarum teetricibus pallido-olivaceo distincte limbatis, abdomine quoque paUidiore flavo, 

 distinguendus. (Deser. maris ex Lion HUl, Panama. Mus. nostr.) 



Hal. Panama, Lion Hill {M'Leannan^'^^), Chepo {Arc6), Truando K. {Wood'').— 

 Eastern Ecuador ^ ^ s. 



The bill of B. mquinoctialis is usually larger than that of B. brevirostris, but so much 

 variation is found in this respect in the latter species that this character becomes 

 untrustworthy. The two forms can with more certainty be distinguished by the greater 

 definition of the edging of the wing-coverts and by the paler colour of the abdomen. 



The distribution of this species is somewhat remarkable, for, as far as our present 

 knowledge goes, there is a wide gap in its range. We have no record of its occurrence 

 between Eastern Ecuador and the Isthmus of Darien, yet specimens from these widely 

 separated places present no tangible points of difference. 



Nothing has been recorded of the habits of this species, which inhabits the dense 

 forests of the eastern side of the Isthmus of Panama, at a slight elevation above the 

 sea-level, and the slopes of the Andes a few thousand feet above the sea. 



3. Rhynchocyclus sulphurescens. 



Platyrhynchus sulphurescens, Spix, Av. Bras. ii. p. 10, t. 12. f. V. 



Rhynchocyclus sulphurescens, Cab. & Heine, Mus. Hein. ii. p. 56'; Scl. Cat. Birds Brit. Mus. xiv. 

 p. 168'. 



Cyclorhynchus sulphurescens, Lawr. Ann. Lye. N. Y. vii. p. 473 *. 



Rhynchocyclus flavo-olivaceus, Lawr. Ann. Lye. N. Y. viii. p. 8 ^ Scl. & Salv. P. Z. S. 1864, p, 359 ' ; 

 Salv. P. Z. S. 1867, p. 148 ^ 1870, p. 198 «; Ibis, 1885, p. 295'. 



Cyclorhynchus cinereiceps, Lawr. Ann. Lye. N. Y. vii. p. 329 ". 



Rhynchocyclus marginatus, Lawr. Pr. Ac. Phil. 1868, p. 439 ". 



Supra olivaceo-viridis ; capite summo cinereo lavato; loris et oculorum ambitu albidis; alis fuscis flavo- 

 olivaceo limbatis; Cauda fusca dorsi colore extrorsum limbafca: subtus sulphureo-flavus ; pectore et 

 hypocbondriis olivaceo tinctis; gula paulo cinerasoentiore ; subalaribus sulpbureis: rostri ma:silla nigra, 

 mandibula pallida; pedibus coryUnis. Long, tota 5-2, alae 2-7, caudsB 2-3, tarsi 0-8, rostri a rietu 0-65. 

 (Deser. maris ex San Pablo, Panama, Mus. nostr.) 



5 mari similis. 



BIOL. CBNTK.-AMBR., Aves, Vol. II., December 1888. 2 



