464 PROCEEDINGS OF THE ACADEMY OP 



Measurements. Head and body 11 -5 in.; anterior limbs 6 in.; posterior limb 

 7 in.; tail to end of hairs 12-8 in.; tail to end of vertebra 11*5 in. 

 The following is a synopsis of the genus : 



1. Species with long hairs upon the head. 



Pelage golden yellow, long and silkey, M. ro s alia Geoff. 



Body black ; head, anterior arms and line beneath 



the tail golden yellow M.chrysomelas Kuhl. 



General color brown ; sides of head naked ; hands 



white, M. o e d i p u s Geoff'. 



Black, back of neck maroon, M. g e o f f r o i i Puck. 



2. Species with short hairs on the back of the head. 



a. Lips not white. 



Head and anterior limbs white ; body and poste- 

 rior feet brown ; tail and abdomen ferruginous, M. b i c o 1 o r Spix.^ 



CM. t a m a r i n nobis. 

 General color black; dashed with reddish brown, < Cebus tamarin Link. 



( M. ursula Geoff. 



!M. lacepedii nobis. 

 Sim. lacepedii Fischer. 

 M. rufimanus Geoff. 



0. Lips white. 



General color black ; beneath reddish, _ M. 1 a b i a t u s, Geoff. 



Back varied black and grey; limbs and tail 



blackish ; entire top of head golden yellow, M. pi le atu s, Is. Geoff. 



1M. mystax, Spiz. 

 M. nigricollis, ' ' 

 M. riijicollis, " 

 l_ M. nigrifrons Is. Geoff. 

 Pelage mostly black; thighs and base of tail) M. devillii, Is. Geoff. 



bright maroon, ( M. weddelleri, Deville. 



Lips (not nose) white ; top of head yellow ; back 

 yellow and black ; thighs and base of tail 



reddish ; hands black, M. f 1 a v i f r o n s, Is. Geoff. 



Head black ; back black, dashed with white ; 

 nape of neck, external and internal surface 

 of limbs reddish ; tail red at base and top, 

 the intermediate portion black, M. i 1 1 i g e r i, Puch. 



Back black, dashed with white, without regular 

 annulaticns ; head black, with a triangular 

 golden spot upon the vertex ; hands and 

 tail black ; belly and internal surface of 

 limbs bright brick red, M. elegantulus, Slack 



* This is the Midas rufimanus of Geoffroy St. Hilaire. Ann. du Mus., 1812, but 

 had been described previously bv G. Fischer, Bulletin de la Societe de Moscou, p. 23, 

 1806 It is curious that Isidore Geoffroy ^t. Hilaire, though crediling to Fischer the 

 Galago demidoffii, (Catalogue des Primaies, p. 81, 1853,) has utterly ignored the 

 existence of this species, though described in the same paper, upon the preceding page. 

 The following is Fischer's description, for the work containing which I am indebted to 

 Mr. Hansen, ihe Librarian of the Museum ol Comparative Zoology, Cambridge, Mass.: 



S. Lacepedii, nigra, pedibus runs, auriculis vellere brevi, labio superiore non 

 deviso. 



Dec. 



