342 



segments of the mandibles very conspicuous laterally. Gnathochilarium 

 resembling in plan that of e. g. Craspedosoma (cf. figure). 



First tergite, wider than the head but slightly narrower than or 

 about as wide as the head and mandibles. 



The rest of the segments strongly convex above, furnished with 

 large slightly depressed, anteriorly shouldered keels, which rise just 

 below the middle of the side; the keel-bearing part of the segments 

 covered with short pale hairs and furnished with the usual six seti- 

 ferous tubercles, two of these are close together on the dorsal part, 

 the other is situated near the middle of the lateral border of the keel ; 

 setae short clavate; there is a transverse granular ridge in front of the 

 posterior border; the cylindrical part of the segments, with a deep 

 transverse groove behind, the anterior part elevated and densely gra- 

 nular or finely ridged. Anal tergite wider than long, not carinate, 

 with the six granules along its posterior border; stemite triangular. 

 Copulatory feet of the cf somewhat simple ; the two pairs of appendages 

 of the 7 th segment modified; both these appendages have lost their three 

 distal segments and the femora of the 1 st pair are much inflated; from 

 the coxae of both pairs springs a downwardly directed process and an 

 additional process springs from the front of the first pair of appendages. 

 Femur of the 5 th leg in front of the copulatoryapparatus modified. 



39. Heterochordeuma monticola sp. n. PI. XIX, fig. 14 — lih. 

 Sumatra: Mount Singalang. Several specimens. 



Colour fuscous, paler beneath, head black, the hairs of the dorsal sur- 

 face white. 



Head smooth above, hairy below. Eyes sub-circular, composed of 

 9—10 not contiguous ocelli, arranged in three vertical series. An- 

 tennae shorter than in H. doriae, the shortness especially affecting 

 the 3 rd and 5 th segments. 



The segments resembling those of H. doriae in build but the keels 

 are distinctly slenderer, with the anterior angle of the lateral border 

 less convex. 



The legs are shorter than in H. doriae and the trochanter and 

 femur are subequal in length; claw longish. 



Copulatory feet completely external, cut off at the femur, this seg- 

 ment in the anterior pair strongly inflated (cf. figure). 



Length 6 mm. 



