SCUTOVERTEX BILINEATUS. 571 



SOUTOVERTEX BILINEATUS,* Sp. HOV. PI. LIV, figS. 



8—16. 



Average length about '62 mm. 

 Average breadth about '42 mm. 

 Average length of legs (first pair) about '38 mm. 

 Average length of legs (second and third pairs) about 

 •36 mm. 



Average length of legs (fourth pair) about "40 mm. 



A species rather like S. maculatus but sharply 

 defined by being monodactyle, and by the absence of 

 external pseudo-stigmatic organs. 



Colour dark brown. 



Texture dull and rough. 



Cephalothorax rather short and broad. Rostrum 

 blunt ; rostral hairs very fine. Palpi with short, spike- 

 like hairs on the terminal joint. Maxillae peculiar, 

 having a single sharp indentation about the middle ; 

 with a small, black denticle in the depression. Lamellse 

 thick, badly-defined ridges, usually joined anteriorly 

 by a more or less perfect, transverse, similar ridge, 

 probably the translamella. Between the lamellae, in 

 the median line, is a broad longitudinal ridge, also ill- 

 defined and not reaching the translamella. The whole 

 space between these ridges, and, indeed, the whole 

 dorsal surface of the cephalothorax, is covered with 

 large, irregularly- scattered, rough, raised dots. No 

 ]pseudo- stigmata nor pseitdo-stigmatic organs visible. 

 Apodemata short, not joined to the sternum ; the 

 anterior pair, which are the longest, are singularly 

 turned within the body ; like a portion of a steamer's 

 screw. 



Legs rather long ; fourth pair passing the posterior 

 end of the abdomen by about the length of the tarsi. 

 The legs are such as are usual in the genus, but the 

 enlarged ends to the tarsi are small. The outsides of 



* Bis, twice ; linea, a line. 



