370 



67. Centrodesmus typicus, sp. n. PI. XXII, fig. 10—10°. 

 Sumatra: Manindjau. A single 9 specimen. 



Colour dull brown , legs , sternal areas and apical segments of an- 

 tennas paler. 



Head finely and closely granular above. The keels of the 1 st segment 

 with a distinct anterior rounded shoulder, the anterior border convex 

 the posterior concave, both finely serrate. The rest of the keels an- 

 teriorly convex, posteriorly concave, pointed at the apex and armed 

 with a few small teeth in front of the apex, those that bear pores 

 rather more strongly denticulate than the rest, the keels of the 15 th 

 directed almost directly backwards and upwards. There is a faint 

 transverse sulcus extending backwards from the 5 th segment. The 

 upper and lateral surface finely granular and coriaceous; no crest or 

 keel above the base of the legs. Sternal areas of average size, not 

 spined. 



Legs with coxa and trochanter short, femur about 4 times as 

 long as the trochanter and about 4 or 3 times as long as the patella ; 

 distance between the legs in the middle of the body i. e. width of 

 sternal area equal to about twice the length of a trochanter , distance 

 between those of the posterior pair a little greater than the length 

 of one of these segments. 



Total length 37 mm.; width across keels 5 mm.; width between 

 keels 3.5. 



Doratonotus, gen. nov. 



Antennae short, incrassate, segments 2—6 subequal in length. 



First tergite about as wide as the head and not covering it. Second 

 tergite very large, expanded and depressed laterally as in Glomeris. 



The rest of the tergites, except the last, with large depressed keels, 

 except the first 4 and the 20 th armed dorsally with a strong back- 

 wardly directed median process. 



Pores on segments 5, 7, 9, 10, 12, 13, 15—19, situated near 

 the middle of the dorsal surface of the keels. 



Anal tergite with convex lobate posterior border. Sternite triangular. 



Legs in contact in the middle line, owing to the absence of sternal 

 areas , the trochanter about half the length of the femur , the patella 

 and tibia very short and subequal in length, the tarsus long. 



