Dammerman: Fauna of the Krakataii Islands. 



93 



in mm. 





1921 



. Sept. 



Oct. 



Nov. 



Dec. 



Jan. 



Febr. Mich. 



April 



May June 



July 



Aug. 



Sept. 



Oct. 



) 168 



395 



173 



331 



510 



618 



327 



118 



41 



74 



40 



41 



42 



206 



3 113 



55 



59 



292 



442 



241 



341 



173 



60 



77 



188 



154 



58 



64 



9 363 



297 



335 



564 



826 



665 



386 



142 







287 



210 



61 



93 



125 



5 814 



539 



383 



73 



585 



1221 



903 



267 







10 



205 



60 



53 



278 



1 250 



311 



471 



623 



550 



— 





120 





150 



— 



— 



— 



— 



9 525 



226 



446 



119 



203 



120 



114 



106 



82 



114 



121 



462 



196 



409 



6 657 



759 



554 



119 



539 



280 



126 



96 



199 



85 



258 



54 



523 



234 



1 208 



115 



168 



158 



366 



292 



263 



115 



115 



126 



202 



109 



151 



85 



6 271 



320 



279 



92 



272 



230 



177 



95 



40 



51 



176 



73 



130 



104 



The Coleoptera are represented by 3 Dytiscides (1 C^te/^r), 2 Hydro- 

 porides and 1 Hydrophilid; the three species of Diptera are all Culicid- 

 larvae; the aquatic bugs consist of 1 Corixa spec, 1 Oerris spec, and 

 1 Naucorid, of which two specimens came flying aboard the ship one 

 evening when we were at anchor in the bay on the east side of Verlaten I. 

 North (April 1921). Of the Odonata 4 species belong to the Aeschninae, 

 one to the Agrioninae. 



Five Crustacea were found: — An Asellid was abundant between the 

 weeds and Algae in shallow water; a Balanid was found fixed to logs and 

 branches under water. Two species of crabs were present, a smaller one and 

 a very big one with a carapace-breadth of about 20 cM.; a mating pair of 

 the latter I observed in the deep part of the lake. Nearly quite transparent 

 shrimps were always collected together with the Asellids; the same species 

 abounds in small streams on Sebesy in the proximity of the sea, where 

 the water is still under tidal influence. 



The Arachnid mentioned in the list is not a true aquatic species, but 

 a spider living on the water and running along its surface with great agility. 



The Mollusca consist of one very small bivalve and three snails, one 

 of which is a Litorina. 



Of the Vermes 3 species are Polychaetes, two of which seem to be- 

 long to the Nereidae ; one species is a Planarian. 



The Bryozoe is a small form growing on submerged leafs. 



The Echiiiodermata are represented by an Asteroid, Archaster spec, 

 which is very abundant in the shallow part of the lake; by an Ophiuroid 

 and a Synaptid, apparently Chondrocloea aspera SLUITER. 



