16 REPORT ON ZOOLOGY, MDCCCXLIII. 



the connexion of the fore and middle fingers of the posterior hand for 

 the length of the first phalanx ; () by a broader white frontal band, which 

 gradually passes into the colour of the vertex, whilst the same band in 

 H. albimamis, on account of the more rigid hairs of which it is composed, is 

 more distinct from that of the vertex; in the light-coloured variety of 

 //. albimamis also the supercilia are black, whilst they arc red in H. en- 

 telloides. 



He also gives in Jacquemont's Voyage (p. 8) some notices on Hylolali's 

 Unlock and concolor, Harl. The latter he characterizes " for the most part 

 black," and indicates Borneo as the locality for it. He then remarks that 

 two specimens had reached him from Lcydeu, under the names of H. con- 

 color or imicolor, in colour very much resembling H. agilis, so that he in- 

 quires whether they are not probably to be referred to that species, or to 

 one differing from H. concolor, Harl., and to which the name of Hylobates 

 Miilleri, proposed by Martin, should be reserved. The Dutch naturalists, he 

 thinks, alone could solve this doubt. I perceive from this that Is. Geoffrey has 

 had no better success with this species than I formerly had; however, I now find 

 from the description given by S. Midler of his^T. concolor m the ' Verhandel' 

 (p. 48), but which has not been noticed by Is. Geoffrey, that the H. concolor 

 described by Harlan and myself is different from Midler's, and that both the 

 specimens mentioned by Is. Geoffrey belong to the latter ; to which, conse- 

 quently, the name of H. Miilleri should by all means be appb'ed. 



Respecting tlie genus Semnopithecus, Is. Geoffroy lias also 

 given several explanations. 



Of his Semnopithecus Dussumieri he has given a detailed description, both 

 in Jacquemont's Voyage (1. c. p. 17) and in the 'Archives du Mus.' (p. 538), 

 and in the latter place has also furnished a beautiful figure (tab. 2). In both 

 works also he has explained its difference from S. cucuttatus, and character- 

 ized the latter more accurately than before. From the appended note I also 

 observe, that there is a specimen in the British Museum, under the name of 

 S. Johnii, of my S. jubatus, the description of which (Schreb. Suppl. i, 

 p. 305) has as yet escaped him, with respect to which I must, however, re- 

 mark, that John's description of the hair of the head of his " Monkey from 

 Tcllicherie" does not at all accord with my S. jitbatus. S. jlavimanus has 

 been described at length by Is. Geoffroy in both works. 



He lias also characterized a new species under the name 

 of Semnopithecus nigrimanus. (Archiv. du Mus. p. 546.) 



"Long hairs on Hie head, forming a mesial, compressed comb or crest. 

 Upper surface, external surface of arms and forearms, legs, gray, approach- 

 ing to brownish ; inferior portions, inner side of arms and forearms, inner 

 side, and the greater part of the outside of thighs, white ; the four hands 



