FAM. PIPRIDA® I5 
7. GENUS XENOPIPO CABANIS 
Xenopipo Cabanis, Arch. f. Naturg. Vol. 13. 1, p. 235 (1847) (type of the genus : Nenopipo atronitens 
Cabanis). 
Characters. This remarkable form is at once recognizable by the broad, flattened 
mesorhinium. The bill reminds one rather of Pachyramphus, but is not so broad, more 
strongly curved and distinctly compressed towards the tip. Nostrils large, oval and exposed. 
Rictal bristles rather soft, as in Pifra. Length and shape of the tail as in Chloropipo, about 
two-thirds of the wing and nearly square, the innermost rectrix being but 2 to 3 mm. shorter 
than the longest (outermost). Wing exactly as in Chloropipo, metatarsus equally short and weak. 
Sexes different. The male is glossy black except the axillaries, under wing coverts and inner 
webs of the quills which are dull brownish black. Bill bluish gray, blackish at the tip of the 
upper mandible. Female uniform olive green, paler on the under parts and more greyish on the 
throat; axillaries and under wing coverts yellowish white. Bill blackish, more brownish below. 
Wing: of 70-72, Q 65-70, tail 46-50, bill 13 mm. 
Geographical Distribution. Cayenne, British Guiana, and North Brazil (south to 
Borba on the Rio Madeira, west to the upper Rio Negro : Rio Icanna). Wonotypic. 
1. Xenopipo atronitens Cabanis. (Plate 3, Fig. 2.) 
Xenopipo atronitens Cabanis, Arch. f. Naturg. Vol. 13, 1, p 235 (1847) (British Guiana). 
Hab. The same as that of the genus. 
8. GENUS MASIUS BONAPARTE 
Masius Bonaparte, Consp. Av. vol. 1, 1850, p. 173 (1 ype: Pupra chrysoptera Lafresnaye); Hartert & Hell- 
mayr, Orn. Monatsb. Vol. 11, 1903, p. 33-35 (Monogr.). 
Synonym: Anticorys Cabanis & Heine, Mus. Heinean. Vol. 2, p. go (1859) (type : Pipra chrysoptera 
Lafresnaye). 
Characters. Bill of the same shape as in Pifra, the culmen distinctly ridged. Nostrils 
round, exposed. Wing with the third and fourth primaries equal and longest, the fifth slightly 
shorter; the first primary equal to the secondaries. Tail about two-thirds of the wing and strongly 
rounded, the rectrices decreasing in length from the innermost pair which is the longest to the 
outer ones. Difference between the median and outermost tail feathers about 6 to 7 mm. Tarsus 
slender and smooth, the scutes being completely fused. Feet dark red in dried skins. The males 
of the three known forms are ornamented with a beautiful crest. The feathers of the forehead 
are somewhat curly, erect and directed foreward; those of the occiput are much elongated 
as to form a pendent crest. In M. chrysopterus coronulatus and M. chrysopterus bellus these 
feathers are « thickened and flattened at the extremity into a horny substance, something like 
that on the wings of the Wax-wing Chatterer » (Sclater, Proc. Zool. Soc. Lond. 1860, p. 91). 
Sexes different. General colour of the males velvety black; middle of the throat, and 
foreneck pale yellow; greater part of the inner webs of the remiges bright clear yellow. Base 
of the inner web of the four outer pairs of rectrices pale yellow. Axillaries and under wing 
