76 



Treubia Vol. Ill, l 



The number of insects, however, found on Sebesy is not much 

 higher than on Krakatau, 474 versus 441. There is a remarkable 

 correspondence ia the number of species belonging to the various 

 orders of insects occurring on both islands, although the species themselves 

 are quite different. Only Lepidoptera and Orthoptera are far more abundant 

 on Sebesy. 



Of Hymenoptera even less species were found on Sebesy than on 

 Krakatau. Noteworthy is the small number of Hymenoptera parasitica^ 

 only 3 species; it is not clear what is the cause thereof. 



Two species of fig insects have been collected. Species of ants are 

 only a trifle more numerous than on Krakatau, but some species viz. the 

 gramang-ant {Plagiolepis longipes JERD.) were extremely abundant. 



Also the number of Coleoptera is less on Sebesy. Worth being men 

 tioned are the Cicindelids, of which 5 species have been collected on this 

 island against none on Krakatau. Common were Cicindela aiirulenta F., 

 distributed throughout the western part of the Archipelago, also C. longipes F., 

 which species occurs on the beach and runs along the water line. 

 The presence of these beetles on the island we may surmise to be due 

 to the larvae, burrowed in the ground, having escaped destruction at 

 the eruption. 



Aquatic beetles, however, so well represented on Verlaten I., were 

 wholly absent, notwithstanding that more freshwater here is available. 



Interesting to note is the absence of Oryctes rhinoceros, occurring 

 already so many years on Krakatau. Also the well-known damage caused 

 by\ this beetle to the leaves of the cocoanut has never been noticed. 

 But another cocoanut pest, the Palm Weevil (Rhynchophoriis ferragineus 

 var. scliach), occurs on the island. 



Also surface Coleoptera are less abundant, as appears from the follow- 

 ing table: — 



Surface 



Coleoptera 



Krakatau 



Sebesy 



Carabidae 



9 

 16 



4 

 10 



9 



8 



Staphylinidae 



Pselaphidae 



3 



1 



Tenebrionidae 



Other families 



8 

 10 



Total . . . 



48 



30 



The difference in the total is caused mainly by the smaller number 

 of Staphylinidae. 



