242 
Birds of Celebes: Bucerotidae. 
most n Gaily alii© d. to Cvunowhinus is unqiiGstionably HhytidocsTOs ^ tliG iiiGmbGrs 
of which correspond with Cranorrhinus cassidix very closely in general coloration, 
much better than do Cranorrhinus corrugatus and waldeni\ indeed the latter are 
as much entitled to generic distinction from C. cassidix as are the species of 
Rhytidoceros. Rhgtidoceros occurs both west and east of Celebes, the four species 
having the following distribution: R, undulatus from Cachar and Pegu down 
the Malay Peninsula to Sumatra, Borneo and Java; R. subruficollis with much 
the same distribution but not known in Java; R. narcondanii from the small 
island of Narcondam in the Bay of Bengal about 170 miles due S. from Cape 
Negrais; and R. plicatus (with its subspecies rujicollis) ranging from the Moluccas 
over New Guinea to the Solomon Islands (G rant, Cat. B. XVII, 1892, 382 sq.). 
It is instructive to see how the conclusions deduced from the geographical 
distribution of the members of one family may be partly undone, partly con- 
firmed, on considering that of another family. The Bucerotidae, like the Phoeni- 
cophaeinae, consist of many narrowly located genera; were the generic distinc- 
tions as finely drawn as in the Phoenicophaeinae several more generic names 
would have to be bestowed. 
Map VII. Distribution of the Hornbills of the East Indies. 
Nr. of species 
in genus 
Indo-Ohina 
Tenasserim 
Malacca 
Sumatra 
Borneo 
Java 
Philippines 
Celebes 
Moluccas 
Papuasia 
1 . Buceros 
2 
t 
t 
t 
t 
rhinoceros . 
* 
* 
sylvestris . . . 
. 
• 
2. Dichoceros .... 
1 
t 
t 
A 
r 
t 
3. Hydrocorax . . . . 
3 
t 
4. Anthracoceros . . . 
5 
t 
t 
t 
t 
t 
►t* 
f 
Sooloo 
convexus .... 
. 
* 
* 
* 
* 
malayanus . 
* 
montani .... 
Sooloo 
5. Gymnolaemus . . . 
1 
. 
Palawan 
6. Penelopides .... 
6 
* 
t 
7. Bhahdoto7Thinus . . 
1 
t 
8. Cranorrhinus . . . 
4 
t 
t 
t 
t 
t 
cassidix .... 
f 
. 
* 
leucocephalus . 
f 
cotTugatus . . . 
. 
* 
* 
* 
waldeni .... 
. 
. 
9. Rhytidoceros . . . ■ . 
4 
t 
t 
t 
t 
t 
. 
t 
t 
undulatus . 
•5f 
* 
* 
* 
* 
•X- 
subruficollis . . 
[*] 
* 
plicatus .... 
. 
• 
* 
* 
10. A7i07Thinus .... 
1 
t 
t 
r 
t 
11. Berenicornis .... 
1 
t 
f 
j. 
f 
t 
12. Rhinoplax .... 
1 
t 
A 
f 
? 
y 
