346 Mr. 0. Thomas on 



This is tlie first example of CaUimico of wliicli the locality 

 is known, the two previous examples liaviii*:^ both been 

 received at the Para Zoological Gardens without any indica- 

 tion of their original iiome. 



The milk-premolars are still in place, but the characteristic 

 third molar (absent in all marmosets) is visible below the 

 level of the bone. 



Oa Marmosets allied to Leontocebus devillei. 



AYe have received from the Para Museum a marmoset ■ 

 from the Upper Rio Purus allied to L. devillei, and, on ex- 

 amining our seiies of this group, I find three species repre- 

 sented — apart altogether from the bufty-headed fuscicollis, 

 the chestnut and butfy mantled illu/eri, apicutatus, &c., and 

 the very different nigricollisj which is without the dorsal 

 marb lings. 



Of those which have dark hetid and n)antle and strong 

 dorsal marbling the s[jecies may be divided as follows: — 



A. Dark on underside extending only to chest, the whole of belly more 



or less ferrii^'-inous. Dorsal marbling grey, scarcely suffused -with 

 bully. An olive or brownish patch over the kuee, in the rul'ous area, 

 liufoiis on tail only quite at its base 



a. Mantle and upper arms obscure rufous or brown. 



L. devillei, I. Geoff Syn. M. leiiciM/enijs, Gray *. 



An adult specimen from liio I'ereue, Peru, and the young 

 type of leiicugenijs. 



h. Mantle and upper arms glossy black, like the feet and tail. A large 

 blackish-browu patch at the point of the knee within the rufous 

 area. 



L, pacator, sp. n. 



Jlah. Rio I'achitea, Peru. Alt. loO m. 

 Type. Adult female. Ji.M. no. 4. 7. 7. o. Original num- 

 ber "l!14. Collected loth Nov., 1903, by Otto Garlepp. 



B. Under surfaca dark brown to the navel, only the lower belly being 



rufous. Dorsal marbling sulhi.sed with buil'y, the light rings on the 

 luiirs clear bulf. No dark patch on tip of knee, the whole leg rich 

 rufou.s. Dai-al thi-ee inches of tail more or less mixed with ferru- 

 ginous. 



* Most curiously, the prominent and extended white whiskers, such aa 

 are j)resent in tlie ty])e of Ifucof/ejiys, prove to diminish with age, a point 

 which I have not seen noticed before. Thus we have young specimens 

 (4-5 inches in length) of //.//////<-/■/ aiul ajiiculafiia, each obtained with 

 adults, and each with large and j)roiiiinent whit(; wiiiskers, which have 

 ])rac(ically disa]>peared when the animal is full-grown. Allowing for 

 this iilteralion, the tyj)e of leucoyeni/s would apjiear to be fjuite like 

 ihviUci. 



