_Rostrum validum, crassum, conicum, basi rotundatum, versus apicem leviter compressum, culmine convexo non carinato; mandibulis emarginatis, superiore apice adunco. Nares basales, simplices, rotundae, juxta marginem sitae, basi paucis plumulis setaceis incumbentibus. Pedes simplices, tribus digitis anticis aequaliter fissis. Remiges spuriae nullae. Cauda brevis: rectricibus duodecim aequalibus._ Typus Genericus _Lanius cayanus_. Linn., Lath., &c. Bill strong, thick, conic, the base rounded, towards the top slightly compressed, the top convex, not carinated; both mandibles notched, the tip of the upper hooked. Nostrils basal, simple, round, situated near the margin, the base with a few short incumbent setaceous feathers. Feet simple, the three fore-toes equally cleft. Spurious quills none. Tail short, of twelve equal feathers. Generic Type _Lanius cayanus_. Linn., Lath., &c. * * * * * SPECIFIC CHARACTER. _P. olivaceus, subtus albidus; capite supra nigro; occipite temporibus et colli lateribus cinereis; pectore lateribus tegminibusque infernis flavis._ Olive, beneath whitish; crown black; nape, sides of the head and neck pale cinereous; breast, sides, and under wing-covers yellow. * * * * * The genus _Psaris_ was first instituted with great propriety by Cuvier; and before the discovery of the species now made known, was supposed to consist of only one, the Cayenne Shrike of Latham, which with the present bird (named in honour of the first zoologist of the age) is found in Brazil. The figure is nearly of the natural size.