1864.] MR. P. L. SCLATER ON NEW AMERICAN BIRDS. 609 
5. HypocNEeMIS FLAVESCENS, Sp. nov. 
Formicivora flavescens, Natt., no. 857. 
Supra cinerea, capite nigro, loris, superciliis et stria mediali albis ; 
cervicis lateribus et interscapulio albo nigroque variegatis : ma- 
cula interscapulari celata, alba: subtus alba, pectore sulphureo, 
hypochondriis et ventre imo cum crisso rubiginoso-rujis : alarum 
tectricibus nigricantibus, omnibus macula apicali fulvescenti- 
alba ornatis: remigibus et rectricibus fuscis, his macula apicali 
viz conspicua terminatis : rostro superiore nigro, inferiore albo ; 
pedibus pallidis. 
Long. tota 4°5, alee 22, caudee 1°7. 
Hab. in reg. Amazonicé, Marabitanas. 
Obs. Affinis H. cantatori (Bodd.), sed pectore flavo facile dis- 
tinguenda. 
This Ant-thrush, which is of the same form as, and nearly allied 
to, H. cantator (Pl. Enl. 700), was obtained by Natterer at Mara- 
bitanas, on the Rio Negro. The sexes are coloured alike. 
6. PrEROPTOCHUS THORACICUS, sp. nov. (Pl. XXXVIII.) 
Supra fulvo-brunneus, dorso saturatiore ; et hujus postici plumis 
laxis elongatis, pallido fulvo et nigro vir conspicue transvittatis: 
alarum tectricibus albo maculatis, fascia submarginali nigri- 
cante: subtus albus; pectore sulphurascente, plumis mediis 
pallido-rufo terminatis, plagam pectoralem formantibus : loris, 
superciliis et lateribus cervicis albo nigroque variegatis ; pec- 
tore laterali cum ventre toto brunneis, albo nigroque squamula- 
tis: remigibus et rectricibus fere unicoloribus fuscis ; secunda- 
viorum externorum marginibus dorso concoloribus ; rostro su- 
periore nigro, inferiore albo ; pedibus corylinis. 
Long. tota 6°6, ale 3-0, caude 3:0, tarsi 11, rostri a rictu 0°8. 
Hab. Amazoniam in ripis fl. Madeira. 
Mus. Vindob. et P. L. 8. 
Obs. Species affinis P. albicolli, sed crassitie minore, rostro bre- 
viore, culmine recto, gonyde ascendente et macula pectorali conspicue 
distincta. 
This bird forms a most interesting addition to the family Ptero- 
ptochide, and is, I believe, the first species of the genus found within 
the limits of the Brazilian Empire. In general colours it approaches 
nearly to P. albicollis of Chili, but is readily known by the pure- 
white breast and mid-belly and the curious pectoral spot. It is also 
considerably smaller in size, and rather smaller than P. rubecula— 
hitherto the smallest known species of the genus. The bill is differ- 
-ently shaped from that of P. albicollis or any of its allies: it is 
short and straight, the culmen being straight nearly to the extremity, 
and the gonys curved upwards rather rapidly towards the point. It 
is compressed much as in P. albicollis. The tarsi are rather shorter 
and by no means so strong as in P. albicollis, and their anterior 
surface, as far as I can judge from my single specimen (the feet of 
which are not in very good order), nearly smooth, the divisions of 
Proc. Zoou. Soc.—1864, No. XX XIX. 
