from Brazil and Ecuador. 101 



lips white ; throat black, belly dark rufous. Inner sides of 

 fore limbs grizzled rutbus, not black as in the other allied 

 species. tjp])erside of hands and feet more or less o;i-izzled, 

 especially on the metatarsals, with oran^^e-rufous. Tail dark 

 rufous for its basal two inches, then gradually passing into 

 deej) black, but there is a hidden rufous ringing to the hairs 

 as far along as the level of the tips of the outstretched hind 

 feet. In M. Devillet only the extreme base is rufous or 

 rufous mixed. 



Size as in M. Devillei. Greatest length of skull 45 mm. 



JIab. Copataza iiiver, Upper Pastasa River, Oriente of 

 Ecuador. 



T^pe. Female. B.M. no. 80. 5. 6. 25. Collected be- 

 tween December 1877 and February 1878 by Mr. Clarence 

 Buckley. Three specimens. 



This marmoset was formerly regarded by me as M. De- 

 villei, Geoff., but it is distinguishable from that animal bv 

 the grizzling of the upper surface of the feet, Geoffroy's 

 species having these of a " noir luisant/' as has been kindly 

 verified for me on the type by M. Menegaux. And the same 

 is the case in M. nigrifrons, Geoff. The extension of the 

 grizzling on the tail to a third of its length before it becomes 

 quite black and the rufous coloration of the inner sides of the 

 forearms are further peculiarities of M. apiculatus. 



An allied species is J/, tripartitus, Milne-Edwards "^j 

 v.hich alone of this group agrees with M. apiculatus in not 

 having pure black feet; but that species has much more 

 strongly defined and contrasted shoulder and body colours, 

 and the outer sides of the thiglis are grey instead of being 

 rufous. 



M. tripartitus is said by Cabrera t to be the same as 

 M. lagonotus, Espada I, an identification which the difference 

 in the colour of the feet makes me doubt ; but in any case 

 the stated resemblance of Espada's species to jNIilne- 

 Edwards^s figure shows that .1/. apiculatus is different from 

 M. lagonotus. 



One of the three specimens of d/. apiculatus has the 

 marbled dorsal hairs pro.'usely mixed with wholly white ones, 

 the general body-colour b.'ing thereby rendered of a nmcli 

 paler grey. This is probably due to senihty. 



The two specimens in the Museum obtained by I\Ir. E. 



* N. Arch. Mus. (2) i. p. 160, pi. iii. (1378). 

 t An. Soc. Espaii. xxix. p. 92 (1900). 



X ' Algiiuos dates . . . fauu. Amazouas/ p. 14 (Madrid, 13"0j ; J. Sci. 

 Lisb. iii. p. 07 (1871). 



