108 COLLEMBOLA FROM NORTHEEN SARAWAK. 



strongly reduced, mandibles hook-shaped, with a lamellous 

 tooth ; maxillae needle-shaped. 



Eyes 2 + 2, nnpigmented, on the outer margin of a tubercle; 

 cornea divided into two halfmoon-shaped parts by an extremely 

 fine line — hence the species name. 



Po slant ennal organ absent, antennal organ III as usual 

 consisting of two staffs. In one specimen they seem to be 

 directed straight upwards, but in another one they are 

 distinctly depressed, as generally seems to be the case among 

 most species. Protective setae of common type I have failed 

 to observe but there is always the usual longer setae on the 

 outside of the organ. 



IV has at the top a retractile tripartite organ, surrounded 

 by several protective setae, which are inserted in special im- 

 pressions on the skin. Sensitive setae of antennae number 

 7, all placed on the last joint. To describe their position in 

 detail offers great difficulties as the different preparations give 

 a different picture depending upon the position of the antennae 

 under the covering glass. On one I find 2 external, 1 anterior 

 and 4 superior. Hairs scattered, simple; claws unarmed. 



Coloration. Specimens in alcohol pure white with a slight 

 shade of yellowish, but according to Dr. Mjoberg fresh pink 

 when alive. 



Locality. Ten specimens collected at Brooketon, Brunei 

 Territory. Lives under rotten logs on damp ground. 

 (Mjoberg). 



Remarks. This form comes close to Imms' Neanura 

 iyitermedia, but the latter has only four sensitive setae on 

 Ant. IV. A couple of these are easy to overlook but the fact 

 that the author especially points out this character in a com- 

 parison with another species and that he had a large material 

 at his disposal, makes it probable that the observation is correct. 

 The structure of the eye-lobes forms possibly also a good 

 distinctive character. 



From other species with 2 + 2 pigmentless eyes the present 

 form is easily distinguished. Neanura coralliria Imms has 

 characteristic lateral protuberances and, to judge from the text 

 as well as the illustration, the sensitive setae are absent on 

 Ant. IV. AcJiorutes roseus Schott from Australia has distinct 

 ■protuberances arranged as in ^4. muscorum, large granula and 

 six sensitive setae on Ant. IV. and Borner's Japanese species, 

 A. Upas pis and A. hirteUus have apart from other separating 

 characters a distinct ventral tooth on the claw-bearing joint. 



