OF TH:p: MERGUI AKCHIPELAGO. 317 



Hypoctonus formosus, Thorell, Ann. Mus. Genov. xxvi. p. 360 ; id. loc. 

 cit. xxvii. pp. 542-553 (18B9). 



Thelyphonus insularis, Oates, Journ. As. Soc. Bengal, Iviii. (2) p. 13, 

 figs. 7 & 8 a889). 



A single example was obtained on Owen's Island. 



The species appears to be tolerably common in the southern 

 parts of Burma. It was originally described from Moulmein, 

 and has subsequently been recorded from Tenasserim and else- 

 where. The name angustus is included in the above synonymy on 

 tlie authority of Dr. Thorell and Mr. E. W. Oates. Mr. Oates 

 has kindly presented to the British Museum a large number of 

 specimens of his species insularis, which were obtained on 

 Double Island. There can, however, I think be little doubt that 

 these examples are specifically identical with Butler's type of 

 Jbrmosus. 



Order Aeake^. 



Fam. Epeieid^. 

 Nephila maculata (Fabr.). 

 Sab. Mergui. 



Fam. Thekaphosid^. 



Selenocosmia jatanensis ( WalcJc.). 



Sab. Mergui. A single female example, giving the following 

 measurements : — Length of body 54 millim., of cephalothorax 23'5 ; 

 width of cephalothorax 20 ; length of maxilla and palp 53'5, of 

 1st leg 81, of 2nd 70, of 3rd SI-, of 4th 82-5, of posterior mamilla 

 14*5 ; length of sternum 10-2, width 10 ; length of labium 3'5, 

 width 4. 



OEmTHOCTONUS Ajidersoni, gcu. ct sp. nov. (PI. XXII. 

 figs. 1-3.) 



Colour a deep coffee-brown, clothed with paler brown hairs. 



Geplialotliorax longer than wide, high in the cephalic region, 

 the anterior third of the upper surface (in the middle line) 

 nearly horizontal, but sloped slightly downwards and forwards, 

 the posterior two thirds sloped upwards at about an angle of 

 40°; the sides strongly sloped from the middle line. The ra- 

 diating grooves defined. The fovea conspicuous, linear, transverse. 

 Ocular tubercle well defined, wider than long, separated from the 

 anterior border by a space equal to half its width ; the eyes set 



