1901.] MYBIAPODA OF THE " SICBAT EXPEDITION." 5] 7 



bristles at the edges. The deep frontal sulcus does not quite 

 reach to the level of the antennae. Antennae short. 



1st iergite. Anterior margin very slightly indentate, straight, and 

 furnished with a ridge with tubercles, but the tubercles are not 

 very prominent or very distinct ; the furrow behind the ridge is 

 carried out into a depression which is bluntly triangular, and 

 extends to near the middle oi; the tergite. The posterior margin 

 is straight with some large tubercles on it, but, as in the anterior 

 margin, the tubercles are confused and not prominent. The sides 

 of the tergite are rounded-olf so as to make a blunt point nearer 

 the anterior than the posterior margin. The tergite is about the 

 same breadth as the head, the curve of the head being continuous 

 with that of the tergite. 



2nd tergite. Is prolonged downward and forward so as to form 

 an open V embracing the first tergite ; the ends are rounded so as 

 to form blunt points. On the posterior mai'gin there is a short 

 ridge covered with tubercles. 



3rd tergite less prolonged forward and backward than the 2nd. 

 The lateral margin is distinct and makes an acute augle with the 

 anterior, though the point is rouuded-oif . 



4th tergite. A trace of shoulder is apparent. 



5ih tergite. The shoulder is apparent, and the anterior angle is 

 less acute. 



QtJi tergite. Anterior angle nearly a right angle. 



12th tergite. The minute teeth are visible on the posterior 

 margin of the keel, those on the anterior margin are not visible 

 distinctly till the 15th. After the 15th the keels begin to be 

 directed backward, and there is a small tooth on the posterior 

 angle, but this is never very big. 



Anal tergite. The anal tergite shows only four of the longitudinal 

 ridges in place of the six possessed by most of the other species. 

 The sterna are smooth, though examination with a lens shows 

 numerous small granules. 



Platyehacus malaccanus Peters. (Plate XXXII. figs. 63-65, 

 68, 87, 88.) 



From large cave, Bukit Jala, Jala District. 



Two perfect specimens and one broken, all female. 



Length 80 mm. Length of aiitennse 8 mm. ; distance between 

 bases of antennae barely 2 mm. 



mm. 

 Width of 1st tergite 8 



mm 

 Width of 6th tergite 13 



2nd „ 19 



„ 16th „ 12 



3rd „ 11 



„ 17th „ 11 



4th „ 12 



„ 18th „ 10 



5th „ 11 



19th „ 8 



Colour coffee-brown at edges of keels and anal tergite. Sterna 

 and legs same colour but lighter. 



Head. Upper lip with median indentation, three stiff bristles on 



