CEBUS 73 



A list is here given of the species recognized by the Author in 

 the British Museum. They are arranged in six groups accord- 

 ing as the hair of the crown is directed, or forms a crest. I. 

 "Hairs of the crown reflexed, bent back around the face, 

 forming a short crest over each eyebrow." II. "Hairs of the 

 crown bent back, those on the sides of the dark crown spot 

 elongate in the perfect state forming two more or less erect 

 crests or tufts." III. "Hairs of the crown short, reflexed, 

 adpressed, not forming any crest." IV. "Hairs of the crown 

 of the head elongate, erect, forming a single central more or 

 less conical crest." V. "Hairs of the crown radiating from a 

 center; directed forward in front, and forming, with the 

 eyebrows, a transverse crest." VI. "Hairs of the crown 

 elongate, erect, diverging in all directions, forming a kind of 

 cup." Under No. I, one species only is placed, C. leucogenys 

 Gray, = C. cirrifer (Humb.). With No. II, are arranged, 

 C. apella I. Geoff., a composite of C. apella (Linn.), and C. 

 FATUELLUS (Linn.) ; C. elegans E. Geoff., which he says — 

 C. pallidus Gray, not then described, but Geoffrey's animal = 

 C. AZAR^ Rengg. ; C. cirrifer (Humb.); C. vellerosus I. 

 Geoff. No. Ill, has C. capucinus I. Geoff., (nee Linn.), = C. 

 APELLA (Linn.) ; C. xanthocephalus Spix, = C. variegatus; C. 

 VARiEGATus E. Geoff. ; C. albifrons (Humb.) ; C. hypoleucus 

 — C. capucinus (Linn.) ; C. leucocephalus Gray = C. albi- 

 frons (Humb.) ; C. Havescens Gray, = C. unicolor Spix. No. 

 IV, includes C. robustus = C. variegatus Geoff. ; C. 

 annellatus Gray, — C. apella (Linn.). No. V, has C. chry- 

 sopus F. Guv. ; C. subcristatus Gray, — C. variegatus Geoff., 

 juv. No. VI, contains only C. capillatus Gray, — C. variegatus 

 I. Geoff., juv. If the manner in which the hair on the crown 

 was directed had been considered from living animals, it 

 might be deemed of more importance as a character, but in 

 this instance many of Gray's specimens were badly prepared, 

 and the hairs greatly disarranged, and in some cases at least, 

 gave a very imperfect and doubtless erroneous idea of how it 

 was worn during the life of the animal, and therefore was 

 not to be relied upon. Gray's knowledge of the species of 

 Cebus was derived chiefly from the examples in the British 

 Museum, and he nowhere states that he had ever examined a 

 single type of other Mammalogists, and in view of the many 

 errors in his list, his remarks at the beginning of his article 



