^YUEELER. yORTH A2IEUICAX AXTS 317 



This species is evidently rather closely related to both C. festinatus and 

 C. ocreatiis, but is readily distinguished from the former by its greater 

 size, the shape of the ch'peus, the coloration, the stiff er hairs on the scape 

 and coarser foveolation of the head, from the latter by the shape of the 

 ch-peus, foveolation of the head, coloration of the legs and the presence 

 of erect hairs on the antennal scapes. 



]8. C. acutirostris sp. nov. 



Worker major. Length. ]2-lo mm. : head. 3.5 x 3.3 mm. : scape. 3 mm. ; hind 

 tibia 3.9 mm. 



With the stature of vicinus, but with' a proportionally smaller head, which 

 has rouuded. convex cheeks and posterior corners and broadly excised pos- 

 terior border. Eyes feebly convex, rather large. Mandibles 6-toothed. Cly- 

 peus cariuate, produced in front as a pointed angle, which is slightly turnei 

 up at the tip. Just behind this tip the carina is interrupted fcfr a short dis- 

 tance by a feeble transverse impression. The anterolateral' boi'der of the cly- 

 peus is deeply sinuate on each side. Frontal area and groove distinct ; frontal 

 carinae feebly lyrate and more approximate than in vicinus and vafer. An- 

 tennal scapes slender and terete at the base, neither flattened nor dilated, 

 slightly enlarged at their distal ends. Thorax narrower than the head and 

 shaped much as in vicinus. but the epinotum is more like that of vafcr. having 

 its basal surface about twice as long as the declivity. Petiole high and rather 

 narrow, with both anterior and posterior surfaces convex, the former more 

 than the latter ; border sharp, feebly emarginate in the middle above. Gaster 

 of the usual shape. Legs long ; middle and hind tibije sulcate on their anterior 

 surfaces and rather triangular in cross section. 



Head subopaque, densely shagreened ; mandibles, cheeks, gula, sides, frontal 

 area and anterior half of front rather smooth, shining. Mandibles finely and 

 densely striate and coarsely punctate. Cheeks with numerous elongate 

 foveolse ; clypeus, front and vertex with large, more scattered and rounded 

 foveolse. The punctures on the sides of the head very small and scattered. 

 Thorax subopaque and shagreened like the head ; petiole and gaster more 

 finely shagreened, shining. 



Hairs yellow, erect, rather short and sparse on the upper surface of the 

 head, thorax and gaster and border of petiole, more numerous on the gula. 

 Marginal hairs of clypeus rather long and prominent. Cheeks with a few 

 short, erect hairs. Femora with a row of long, sparse hairs on their flexor 

 surfaces ; tibiiie without hairs on their extensor surfaces, but with a row of 

 stiff graduated bristles along the whole length of their flexor surface. Pubes- 

 cence ver.v short and dilute, discernible only with difficulty except on the 

 scapes. 



Head black ; mandibles, clypeus and frontal area deep red ; antennal scapes 

 black, with yellow or red bases and tips ; funiculi brown or yellow. Thorax 

 and legs yellowish brown ; pronotum and. to a less extent, the mesonotum 

 sometimes blackish or dark brown ; tibi;e and tarsi light brown. Gaster 

 brown, with yellow posterior borders to the segments : venter and base or 

 whole of first segment yellow. 



