HYLOBATES 173 



Specimens of this Gibbon procured by me at Claudetown and now 

 in the British Museum show that the coloring in different parts of 

 the body must be considered of little importance,- as I obtained eleven 

 specimens, five of which were in the same troupe, and the other six 

 from the same locality, varying in color as much as it was possible 

 for them to do ; some had yellowish backs and black chests, and some 

 nearly black all over, whilst others were almost a complete silvery 

 gray. I therefore came to the conclusion that Hylobates mulleri and 

 Hylobates leuciscus cannot be separated. The peculiar bubbling noise 

 they make is similar. I think it very unlikely that two distinct species 

 should be so constantly found together as they are in Sarawak. 



"The natives call the silver gray variety Emplian or Wa Wa, and 

 the dark one Emplian-arang (coal) because of its color. The noise 

 made by these gibbons is very pretty, commencing punctually at five 

 o'clock in the morning and continuing till the sun is above the tops 

 of the trees. They become very tame and make very nice pets." 



In regard to Mr. Hose's decision that H. mulleri, (H. concolor 

 of this work), and H. leuciscus cannot be separated, it must be borne 

 in mind that he is writing of the Bornean gray Gibbon that has been 

 called leuciscus by some writers, and not Schreber's leuciscus from 

 Java, to which Mr. Hose does not refer. He is undoubtedly correct 

 in referring to one species all the Gibbons seen and obtained by him 

 in Borneo, but the true leuciscus from Java has little resemblance 

 to H. CONCOLOR, in fact none at all to the typical style, for the black 

 and brown animal is not found in Java, and H. leuciscus of that 

 island has none of the variations so characteristic of the Bornean 

 species. 



This Gibbon was described by Harlan, most probably from an 

 immature female, whose peniform clitoris misled him into charac- 

 terizing his example as an "hermaphrodite ourang outan." ( !) The 

 type was imported from Borneo into New York in 1826, and lived for 

 some time, and at its death was considered to be less than two years old. 

 The teeth had not all appeared as there was but the first molar on 

 each side of both jaws the second and third not having come. Harlan 

 says there were three molars, but the first and second of these must 

 have been premolars. 



Trouessart in the Supplement to his Catalogus Mammalium, 1904- 

 1905, in a footnote, states that concolor Harlan was applied to two 

 different species of which the oldest was a young H. (symphalangus) 

 syndactylus, and that the name concolor must be abandoned. In this, 

 however, he is in error. Harlan never described any Hylobates in 



