241 
*49, ARACHNOTHERA MAGNA (HopGs,). 
Op. eit. p. 214. 
3 6. ; 
Out of the 49 species of birds procured, 33 (marked with an 
asterisk) are strictly confined, so far as the Peninsula is concerned, to 
the zone above 3,000 feet, while three (marked with a dagger) are of 
only accidental occurrence below that limit. Of the remainder, six 
may be classed as submontane while only seven are generally met with 
at low elevations. 
Compared with the list of 86 species from the hills of Negri 
Sembilan (antea, p. 219) it will he observed that only ten species—viz. : 
Macropygia ruficeps Calyptomena viridis 
| 
Nyctiornis amicta | Abrornis schwaneri 
Chotorhea mystacophanes | Hemixus cinereus 
Pyrrhopicus porphyromelas _ Stachyris davisoni 
Chrysophlegma humei | Cittocincla macrura 
are common to both lists, while of these 10 species, seven are low-land 
species, three are submontane and none are high elevation forms. 
It is, therefore, I think, fairly evident that at some comparatively 
recent time a barrier has existed between the mountains of Southern 
Selangor and their continuation in Negri Sembilan, sufficient to pre- 
vent the extension of the dominant continental and Sumatran form 
southwards. It is evident, also, that this barrier must have been a sub- 
stantial one, as wide stretches of low country separating the Gunong 
Tahan Ranges from the backbone of the Peninsula have not sufficed to 
effect any specific differentiation in the fauna of the two ranges. 
Such evidence as is afforded by the small number of mammals 
found at high eleyations also bears out the same contention, 
