76 bulletin: museum of comparative zoology. 



the head; funiculi with 4-jointed club, all the joints longer than broad. Tho- 

 rax resembling that of C. deformis, but the epinotum is less swollen above and 

 is armed with two sharp, backwardly directed spines, which are longer than 

 broad at their distinctly swollen bases. Promesonotal suture absent, pro- and 

 mesonotum together, excluding the neck, as long as broad, robust, only slightly 

 narrowed behind to the mesoepinotal suture, which is distinct and transverse, 

 but not impressed. The epinotum is broader than long, broader than the pro- 

 and mesonotum, bulging on the sides and dorsally in front so that the base is 

 very convex in profile. The declivity falls off vertically between the spines; it 

 is as long as the base and longitudinally grooved in the middle. A more or less 

 distinct carina or prominent ruga runs along the middorsal line of the thorax 

 from the neck to the epinotal declivity, with an interruption at the meso- 

 epinotal suture. Petiole longer than broad, as broad in front as behind, octag- 

 onal, the anterior and posterior borders longer than the six other sides, which 

 are subequal. In some specimens, especially in the small workers, the angles 

 become rounded so that the petiole may be described as elongate elliptical. 

 Its upper surface is flat; in profile it is slightly thicker at the posterior than at 

 the anterior end. Postpetiole as broad as the petiole, contracted posteriorly, 

 its anterodorsal surface flat, bilobed behind, but without a median longitudinal 

 furrow in large specimens, feebly sulcate in small specimens. Gaster thick 

 and broad, triangular, with straight anterior border, rounded anterior corners 

 and pointed tip. Legs moderately long and stout. 



Opaque; gaster and mandibles distinctly shining; the latter coarsely 

 longitudinally striate and punctate. Clypeus and head densely punctate and 

 reticulate-rugose, with more prominent longitudinal rugae anteriorly, growing 

 finer and merging with the punctate surface on the occiput, sides, and posterior 

 corners. Thorax densely punctate, the upper surface of the pro- and mesono- 

 tum and base of the epinotum also vermiculately rugose. Petiole, postpetiole, 

 and first gastric segment much more finely and densely punctate than the 

 thorax, the first segment also with sparser and somewhat larger, piligerous 

 punctures; remaining gastric segments, legs, and scapes smoother, more 

 shining, transversely alutaceous; the legs with sparse, coarse piligerous 

 punctures. 



Hairs short, whitish, delicate, sparse, and erect, of uneven length on the 

 body, more numerous on the head and thorax than on the pedicel and gaster; 

 shorter and more appressed on the legs and antennae. Pubescence pale, 

 rather long, sparse, very distinct on the gaster and sides and posterior corners 

 of the head. 



Dark brown; mandibles, except the teeth, gula, and sometimes the lateral 

 and posterior corners of the head, sides of epinotum, upper surface of petiole 

 and articulations of legs, ferruginous red, second to fourth tarsal joints reddish 

 yellow. 



Numerous workers taken by Harrison W. Smith near Kuching 

 (type-locality) and three workers from the Ranibungan River, Sara- 

 wak. 2\jpi.— M. C. Z. 8,948. 



