Dammerman: Fauna of the Kfcikataa Islands. 71 



Also Aphids were not observed on Krakatau or Verlaten I. in that 

 year; one species was found on Lang I. only. In 1Q20— 1921 one species, 

 Aphis rnalvae KoCH, was very common on both islands. 



From Verlaten I. DOCTERC VAN LEEUWEN has recorded another species 

 which produces shoot galls on Oplismenus compositus Beauv. 



Jacobson found in 1908 only one Coccid on Krakatau, now five species 

 were collected on this island and six on Verlaten L The abundance of 

 mealy bugs on beach plants was very striking. Among the gall-producing 

 Phytophthires the Psyllids hold the majority. The Phytophthires identified 

 by V. D. GOOT are listed in Appendix H. 



A great number of Thysanoptera^ not recorded at all by JACOBSON, 

 has been collected by DOCTERS VAN LEEUWEN. Most species were found 

 in flowers and, owing to their smallness, these insects may have been 

 overlooked in 1908. The species are determined by Dr. Karny (see List G.). 



Jacobson writes it struck him that so few Orthoptera were to be seen, 

 as well with regard to species as to individuals. This cannot be maintained for 

 the present time, the total number of Orthoptera from Krakatau having been 

 doubled and on Verlaten L 22 species have been caught against one in 1908. 



Interesting to note is the abundance of this group of insects on Ver- 

 laten L North. Here about the same number has been found as on Krakatau, 

 whereas from other groups only half the number of species is recorded. 



Nearly all families are represented, only Phasmids are still absent. Espec- 

 ially Lociistidae (Phasgonuridae) have increased greatly, one species 

 being mentioned for both islands in 1908, and 8 in 1920 — 1921. A prelim- 

 inary list of the Orthoptera identified by Dr. Karny is to be found in 

 Appendix F. 



Odonata are very common not only at the lake on Verlaten L North 

 but also on Krakatau where, except at the small breeding places near the house 

 on the S. E. end, brackish or fresh water is absent. Six species have been 

 collected on Verlaten I., four on Krakatau. Dragonflies have great powers 

 of flight and can easily accomplish long distances. 



We have often observed a great number of these insects swarming 

 around coral islands in the bay of Batavia or Java Sea, although these 

 islands are very dry and not a single breeding place could be detected. 



The three Neuroptera collected on Krakatau consist of a Myrmeleon^ 

 .of which ant-lion the larvae were found abundantly around Mr. Handl's 

 house; further one Psocid and one Chrysopid. Another species of the last 

 family was caught on Verlaten L 



Isoptera are also abundant on both islands, especially one species 

 building large nests adhering to the stems of trees. Once in a nest of this 

 termite on Verlaten I. two species of termitophilous Staphylinidae were found 

 by the author. Altogether three species of termites have been collected. 



The Aptera are represented by two species, one of which belongs to 

 the Thysanura^ probably the same species as recorded by JACOBSON. 



