cuAP. isO IN DO-MALAY ISLANDS. 147 



least two extend to Malacca and obg to "Borneo. There are 

 a very large number of birds, such as the great Argus 

 pheasant, the fire-backed and ocellated pheasants, the 

 crested partridge (RoUulus corooatus), the small ITalaccii 

 jnirrot (Psittititis incertus), the p-eat helmeted hornbill 

 ( Buceroturus galea tus), the pheasant ground-cnckoo (Cur- 

 po<^occ)rK radiatus), the rose-crested bee-eater (2?^yctiornis- 

 auiicta), the gi'eat gaper (Corydon siimatraiiiis)^ and the 

 green-crested gaper (Calyptomena viridis), and many 

 otlKirs, which are common to iLdaeca, Sumatra, and 

 Borneo, but are entirely abi^ent from Java. On the otlier 

 3tand we have the peacock, tlie green jungle cock, two blue 

 ground thrushes (Amuga cyane^ and Myophonus flavi- 

 rostris), the fine pink-headed ilove (Ftilonopua porpliyreus), 

 three broad-tailed ground ]>igeons (ilacropygia), and many 

 other interesting birds, which are found nowhere in the 

 Archipelago out of Java. 



Insects furnish us with similar facts wherever sufficient 

 (lata are to be had, but owing to the abundant coUections 

 that have been made in Java, an unfair preponderance may 

 be given to that island. This does not, however, seem to 

 lie the case with the true Papilionidte or swallow-tailed 

 buU<irflies, whose large size and gorgeous colouring has led 

 to tlieir being collected more frequently than other insects. 

 Twenty-seven species are known from Java, twenty-nine 

 from Borneo, and only twenty-one from Sumatra, Four 

 are entirely contined to Java, while only two arc peculiar 

 to Borneo and one to Sumatra. The isolation of Java will, 

 however, be best shown liy grouping the islands in pairs, 

 and indicating the number of sficcies common to each pair. 

 Thus r— 



Stttnatra . . 21 do. / , . 



Jftva. ... 27 do. '^^^ 



Making some allowance for our imperfect knowledge of 

 the Sumatran species, we see that Java is more isolated 

 from the two larger islands than I bey are from each other, 

 thus entirely contirming the results given by the distri- 



L 2 



