16 | PRIMATES. 
In the Tee-tees, Saimiris, or Squirrel-Monkeys, the eyes, although large, are much 
smaller than in the last genus, and are placed closer together, the interorbital septum 
being only imperfectly ossified. The skull is remarkable for its elongated form, the 
occipital region being greatly produced beyond the foramen magnum ; and the canine 
teeth are well developed, instead of being no higher than the molar series, as in 
the allied genus Callithriz. TExternally these Monkeys are slender and graceful in 
form, with long, short-haired, non-prehensile tails; and in habits they are lively, gay, 
and affectionate, as might be expected from the remarkable volume of their brains. 
Four or five species of Tee-tee range from Brazil and Bolivia to ,Nicaragua and 
Guatemala. The single Central-American species is recognizable by its bright rufous 
back and jet-black cap. 
1. Chrysothrix crstedi. (Tab. Il.) 
Saimaris sciurea?, Sclater, P. Z.S. 1856, p. 189 (nec Linn.)'. 
Chrysothrix sciurea, Sclater, Nat. Hist. Rev. 1861, p. 510°; Frantzius, Arch. f. Naturg. xxxv. 1, 
p. 260 (nec Linn.)*. 
Saimiris entomophaga, Sclater, P. Z. S. 1872, p. 3 (nec d’Orbigny)*. 
Chrysothrix érstedi, Reinhardt, Vidensk. Meddelelser, 1872, p. 157, t. ili. (descr. orig.)’ ; Giinther, 
Zool. Rec. 1872, p. 8°. 
Saimaris erstedi, Sclater, P. Z.S. 1873, p. 434"; 1874, p. 495°. 
Saimiri Grstedii, Schlegel, Mus. Pays-Bas, vii. p. 245°. 
Titi, Cuistiti, of Costa-Ricans. 
Hab. Guaremata, Solola? (Kelly, Zool. Soc. Viv.8); Costa Rica, Terraba, Piris (Hrant- 
zius®); Panama, Chiriqui (Bridges!; Girsted, Mus. Hafn.>; Arcé, Mus. Brit. ; 
Mus. Lugd.°). 
The first record of the existence of a Squirrel-Monkey in Central America was 
founded ona skeleton brought from Chiriqui by Bridges, which was doubtfully referred 
by Mr. Sclater to C. sciwrea (Linn.)!. The same name was given by Dr. v. Frantzius to 
the Tee-tee of Costa Rica?; but Mr. Sclater subsequently identified specimens sent by _ 
Arcé from Chiriqui, and now in the British Museum, with d’Orbigny’s C. entomophaga*, 
a native of Bolivia and Peru. Professor Reinhardt, however, regarded the Central- 
American animal as distinct, and named it after the well-known Danish traveller Cirsted, 
who had brought an example from the State of Panama as far back as1849°. An exa- 
mination of a considerable series of specimens tends to prove that Dr. Reinhardt is correct. 
It is true that, as Dr. Gtinther has observed §, there is a great variety in the darkness 
of the cap in the Peruvian species; but I have not yet seen any which showed any 
approach to the rich red colouring of the upper parts which is characteristic of 
C. erstedi. It is to be observed, also, that there is a wide gap between the known 
ranges of the two forms, neither having hitherto been recorded from Colombia, where 
C. sciurea appears to take their place. . 
