512 MESSRS. SCLATER AND SALVIN ON THE CRACIDS. [June 9, 
Orn. Bras. V. Pelzeln. (Of this Synopsis.) 
P. 285. O. araucuan = O. albiventris. 
286. O. albiventris = O. guttata. 
343. Crax mikani 3 = Crazx daubentoni. 
» C.mikani 2 = (. alberti. 
Sect. III. Synopsis of the Species of Cracide. 
The 51 species of Cracidee known to us seem to be naturally 
separable into three subfamilies. The external differences between 
the first two of these groups, although very appreciable to the eye, 
are not easily expressed in strict definition. There can, however, 
be no doubt that the Curassows and Guans belong to naturally di- 
stinct forms; and Prof. Huxley (P. Z.S. 1868, p. 297) has pomted 
out a trenchant difference in the proportions of their pelvis, which 
renders their skeletons easily recognizable. In the Penelopine the 
“moiety of the dorsal aspect of the pelvis, which is bounded in front 
by a line drawn through the acetabula,” or “ postacetabular area” 
(as Prof. Huxley proposes to call it), is comparatively broad ; in the 
Cracine it is narrow. Combining this osteological character with 
a marked divergence in the form of the rostrum of the two sections, 
we may divide the subfamilies as follows :— 
a. area postacetabulari angusta: rostro superiore altiore 
quam latum ; culmine cOMpressO ............eeesseeee ees I. Cracina. 
b. area postacetabulari lata: rostro superiore latiore quam 
altum : culmine depresso. 
a’. vertex plumis obtectus: mesorhinium nudum: 
MAVOS PALULES Weseesacsereeevccctaecaastmsscsesarscvses II. PENELopPIn«. 
3’. vertex tuberculo osseo munitus: mesorhinium 
dense plumosum : nares absconditx ............ TII. OrEorHASINE. 
Taking these three subfamilies in order, we propose to arrange 
them as follows :— 
Subfam. I. Cracinz. 
a, rostri cera mollis, plus minusve tumida: nares patule in 
Media maxilla posite ..........secssenecscrecneereeeeneensse senses 1. Craz. 
b, rostrum usque ad basin corneum, cera nulla: nares ad basin 
maxillz posite. 
a’. lora nuda, nares patule ..............cecseesesereeeeeees 2. Nothocrax. 
b'. lora dense plumosa, nares plumis absconditez. 
a'', sexus dissimiles: tuberculum frontale maxi- 
TRU: \OVITONIMNG jock orce, ves sese ocr epsteesias es ssios 3. Pausi. 
3d". sexus similes: culmen valde elevatum sed 
VAKshHDeNclabind le .shs. ccs saewcceseuccorieesdncrets 4. Mitua. 
Genus 1. Crax. 
Type. 
Craz, Linn. S. N. i. p. 269 (1766) ........-.++5- C. alector. 
Mituporanga, Reichenb. Tauben, p. 136 (186 ?).... C. globicera. 
Crossolaryngus, Reichenb. Tauben, p. 136 (186 1).. C. globulosa. 
Spherolaryngus, Reichenb. Tauben, p. 136.(186 ?).. C. alberti. 
