522 Records of the Indian Museum. [Voi,. VIII, 



distally. The eighth joint is fully as broad as long, the ninth 

 and tenth successively broader. The eleventh is larger and sub- 

 spherical. 



The right mandible is compressed distally, and has one large 

 terminal tooth with a smaller dorsal tooth above it. The outer 

 margin is ventrall}' elevated. The whole space between the ter- 

 minal tooth and the broad molar tooth is occupied by a mandible- 

 sac. The left mandible is missing. 



The lacina of the maxilla is about half as large as the galea ; 

 both are expanded and clothed with stout curved hairs distally. 

 The palp is 4-iointed. The first joint is small and parallel-sided ; 

 the second is fully twice as long as the first, somewhat broader at 

 the base and fully twice as broad distally; the third joint resem- 

 bles the second in form, but is only about two- thirds as long ; the 

 fourth joint is large and triangular, about as long as the first and 

 second together and about as broad as long. 



The labial palps are 3-jointed ; the second joint is somewhat 

 larger than the first, and the third than the first and second 

 together. 



The mentum is trapezoidal. 



The legs are moderately slender, and present no special fea- 

 tures. 



Byrsax tuberculatus, n. sp. 



(Plate xliii, fig, 2.) 



Kobo, 400 ft., Abor Country, 30-xi-ii. One specimen. 

 A small brown, parallel-sided, oval beetle about twice as long 

 as broad, covered with strong tubercles none of which form massive 

 elevations as is the case in B. excisicollis, Gebien, from Borneo.^ 

 Length 4- 3-5-0 mm. 



The head is shaped as in B. excisicollis, but is smoother 

 between the eyes and bears a pair of erect horns of variable length, 

 directed somewhat backwards and bowed a little outwards, obliquely 

 truncate and spiny postero- laterally at the end. 



The pronotum and elytra are punctured and tubercular (see 

 pi. xliii, fig. 2). The posterior margin of the former is shaped as 

 in B. excisicollis. 



The loi&er surface of the head is closely and coarsely punc- 

 tured, as is also the prosternum which is strongly keeled between 

 the coxae. The mesosternum is more finely and sparsely punc- 

 tured, with the space between the punctures highly polished. 

 The metasternum is grooved in the middle line ; both it and 

 the abdominal sterna are closely and coarsely punctured. 



The antennae are ii-jointed. The first joint is about as 

 long as the second and third together, the third is longer than 

 the fourth which is fully as long as the second, the fifth to tenth 

 joints are enlarged in front, the fifth slightly, the others more and 



1 Described in Sarawak Museum "Journal II, pp. Q-n, pi. i, fig- 6, since the 

 public.'ition of the " Catalogue." 



