NOTES ON MILLIPEDES. 41 



Order Aranece. 



The True or Web-, Spiders 



Malay "Laba-laba" 



Siamese " Meng-moung " 



Jakun :l T'ivoiuoh" (Lake-f Kelsall. J.S.B.R.A.S. 



Xo. 2Q, 1894, p. 56.) 



The true Spiders have four pairs of legs, of similar con- 

 struction, each composed of seven segments, and used for locomo- 

 tion, and two modified anterior pairs of limbs, one (the palpi) 

 leg-like and composed of six segments, including the basal 

 segment or maxilla, and one (the mandibles) composed of only 

 two segments and containing' a poison-gland which opens at 

 the tip of the second segment which forms the poison-fang. 

 The spinning mamillae, upon which open the silk glands, are 

 situated on the lower surface of the abdomen, and are a charac- 

 teristic feature of the true Spiders. 



The sexes of spiders may be distinguished by the last seg- 

 ment of the palp which is modified into an mtromittent organ in 

 the male, while the female, in most families, has a horny plate 

 (vulva) on the forepart of the lower surface of the abdomen. 



The true Spiders are divided into two Sub-orders : — 



1. Sub- order Mesothelon. Abdomen segmented, its upper surface 

 covered with eleven dorsal plates. Eight spinnino- 

 mammillae placed in the middle of the lower surface 

 of the abdomen. This sub-order contains only one 

 family Liphistiidtt. and one genus Lipl/istius, known 

 from Burma. Sumatra. Penang and Selangor, where 

 it has been recently discovered by Mr. H. X. Kidlev. 



'2. Sub-order Opisthothelae. Abdomen not segmented. Six, or 

 fewer, spinning mammillae placed near the hinder 

 extremity of the lower surface of the abdomen. 

 This Sub-order contains a host of forms, divided into 

 two sections of many families : only a few of the 

 more noticeable can be mentioned in the limits of 

 this paper. 



