31. CBNTUBIO. 543 



1. Centurio senex. 



Centurio senex, Gray, Ann. 8r Mag. Nat. Hist. x. p. 269 (1842) ; 



Voyage of the ^Sulphur,' Mammalia, pp. 26, 27, pi. viii. figs. 1, 1« 



(1844) . 

 Centurio flavogiilaiis, Lichtenstein et Peters, MB. Akad. Berl. 1854, 



p. 335. 

 Centurio mexicanus, De Saussure, Rev. et Mag. Zool. 1860, p. 381. 

 ? Centurio (Trichocorytes) m'murtrii, Allen, Proc. Acad. Nat. Sci. 



Philad. 1861, p. 360 -. 



Muzzle extremely short, so short that the eyes are almost at the 

 anterior extremity of the head, and very broad ; the distance be- 

 tween the eyes is nearly equal to half the length of the head, and 

 the opening of the mouth is altogether anterior ; the lower jaw 

 projects in front beyond tho upper ; on the face the naked skin is 

 stretched tightly round the projecting eyes ; the upper lip is divided 

 in front, and the reflected edges are continuous above on either side 

 with the elevated margins of a depression in which the nostrils 

 open, and are separated by a flat, straight-sided, naked elevation ; 

 above this and between the eyes are two pits arranged transversely, 

 with raised, thickened, and sharply cut margins, higher behind and 

 internally, where they form the antero-lateral boundaries of a cen- 

 tral deeper ceU, behind which the forehead has a flattened, poste- 

 riorly rounded elevation in the centre. (These ridges and processes 

 win be better understood by reference to Plate XXX. fig. 6.) 



Ears shorter than the head ; inner side of the ear-conch divided 

 near the middle by a deep acutely angular notch, which cuts off as 

 an oblong lobe half the inner side of the conch ; outer side straight 

 above, slightly convex lower down, emarginate opposite the tragus, 

 terminating in a thickened triangular antitragus with a narrow 

 cartilaginous process ; tragus small, with a straight inner and a 

 convex toothed outer margin. Under surface of the lower jaw and 

 neck banded by three narrow folds of integument extending round 

 from the bases of the ears ; the first commences on each side at the 

 anterior margin of the antitragus and passes down near the angle 

 of the mouth, forming in its middle third a wide and flattened band, 

 having its posterior margin sinuate and divided into three projec- 

 tions ; the second band commences behind the first, but is less 

 distinct at its origin, and in the centre beneath forms a small round 

 cell ; the third band is close behind this one, and has a smaU wart 

 on each side bounding its middle third f. 



* I have not yet had an opportunity of examining the single specimen of 

 C. m'murtrii which is preserved in the collection of the Smithsonian Institute 

 at Washington. It was sent from Mirador in Mexico along with specimens 

 of Centurio senex, and I have little douht that it represents the male of this 

 species, of which females alone appear to have been hitherto obtamed. (See 



footnote below.) , . „ ■, i. r. i .i. 



t Such are the characters of the throat-bands in the adult temaie ; they re- 

 present, I believe, but the rudimentary condition of certain structures occupying 

 the same position in the male, of which probably the nearest representatives 

 are found in the great gular and thoracic pouch and glandular organs of 



