Daaimerman: Fauna of the Krakatau Islands. ' 11 



The number of Lepldoptera from Sebesy, however, is much higher than 

 from Krakatau. At our first visit we were already impressed by the greater 

 abundance of Rhopalocera. Heterocera also are far more numerous. 



Of Diptera the totals on both islands are nearly the same, but the 

 species are quite different. The presence of Tabanids on Sebesy has certainly 

 to be accounted for by the cattle occurring on the island. 



\w the wood mosquitos are common but they are not such a nuisance 

 as at the lake on Verlaten I. North. Further noteworthy is the greater 

 number of gall-flies on -Sebesy. 



Also Rhynchoia occur on both islands in about the same number. 

 Although three species of aquatic bugs could be collected on the islands 

 of the Krakatau group, remarkably enough none were to be found 

 on Sebesy. Here Dundubia was a far less noticeable insect than on 

 Krakatau. 



Of the nine gall-producing species of Phytophthires seven belong to 

 the Psyllidae. 



The number of Thysanoptera also is not much higher on Sebesy 

 than on Krakatau, but here again quite other species are found (see List G). 

 Whereas gall producers in this group of insects do not occur on Krakatau 

 or Verlaten I. they. are well represented on Sebesy. 



Compared with Krakatau the order of Orthoptera is far more abundant 

 on Sebesy than any other group of insects. The total is nearly twice that 

 of Krakatau. Of Phasmids, wholly absent on Krakatau and Verlaten 1., one 

 species has been collected. 



The remaining orders of insects are represented on Sebesy and Krakatau 

 in about the same degree, only no Neiiroptera were collected on the first- 

 mentioned island. 



Much more abundant, however, than on Krakatau are the Myriapoda 

 on Sebesy. On my first visit to this island, September 1920, the abundance 

 of Myriapods in the wood was very striking. The ground was really 

 covered by different species; on one square Meter I could count 42 individ- 

 uals and six species (see further on). Two families of Myriapods, viz. 

 the Qlonierülidae and Scutigeridae, not found on Krakatau, were both 

 represented by one species. 



The number of Arachnida on Sebesy is only a little higher than on 

 Krakatau. Free-living mites however were less abundant. 



The terrestrial Crustacea consist of 4 species:— two Oniscoids, and two 

 species belonging to the moss-fauna, viz. Epactophanes richardl muscicola 

 (Richters) and an Ostracod, which were identified by Dr. MENZEL. The 

 Orchestia from Verlaten I. was not to be found on Sebesy. 



Interesting to note is the greater number of Mollusca on this island, 

 twice as many as on Krakatau. The species recorded from the latter island 

 have also been collected on Sebesy. Besides there are two species of slugs, 

 a Pupina, and two other snails not known on Krakatau. 



