66 PYGATHRIX 



Measurements. Old male, total length, 1,430; tail, 810. Skull: 

 greatest length, 104; zygomatic breadth, 80; Hensel, 72>; intertemporal 

 width, 46 ; interorbital width, 8 ; width of braincase, 69 ; median length 

 of nasals, 12; palatal length, 34; length of upper molar series, 27 \ 

 length of upper canines, 20. Collett, ex type. A skull of a female 

 in British Museum measures somewhat less. Total length, 90.5 ; 

 occipito-nasal length, 80.4 ; zygomatic breadth, 70 ; Hensel, 56 ; palatal 

 length, 27. 



Mr. Collett gives the following account of this species, (1. c.) : 

 "These monkeys were only met with by Herr Iversen in the Langkai 

 district and were not observed in Deli. They were fairly numerous 

 on several of the estates, especially at Glen Bervie and Beckri. Their 

 haunts were in the highest trees, and they never descended of their 

 own accord to the ground, or visited the rice fields. Herr Iversen 

 saw, however, one wounded individual take to flight on the ground. 

 They always live in companies, and inhabit the dry spots in the 

 thickest parts of the forests. They appear to be non-migratory, and 

 may be met with at all times of the year in almost the same part of 

 the forest. They hardly ever visited the more open places, but kept 

 to the highest tree-tops, where they moved about with the greatest 

 ease, and made the most astonishing leaps through the branches. They 

 were, on the whole, excessively shy ; if they found themselves dis- 

 covered, they endeavored at once to hide, and the mothers would leave 

 their young sitting on the branches whilst they themselves sought 

 shelter in the tree-tops. When hunted they all took to flight in the 

 same direction, so that the companies were not dispersed. 



"The companies appeared to consist chiefly of full-grown indi- 

 viduals, and young ones were but seldom seen. An occasional half 

 grown individual, however, might be noticed following the old ones : 

 babies were not often seen, but these are, on the whole, more difficult 

 to observe, as they are carried by the mother under her belly. The 

 young one brought home was noticed through the mother deserting 

 it, after which it began to shriek. They have a very penetrating cry, 

 which they generally utter in chorus after one has given the note. In 

 the individuals which have been examined no foetus has ever been 

 found. Possibly the pregnant females and the younger ones hide 

 themselves more closely. 



"They were seen in activity only in the daytime, and were not 

 heard to cry at night. They lived, it appeared, only on fruits. In 

 their stomachs were chiefly found the soft pulp of a fruit, belonging 



