530 bulletin: museum of comparative zoology. 



variety of cinerea allied to rutilans, but as I have seen only a single 

 specimen, I have merely removed it from subpolita, to which it was 

 doubtfully referred by Emery. It certainly has ao close relationship 

 to that species. 



113. F. SIBYLLA, sp. nov. 



Worker. Length 5-6.5 mm. 



Head, excluding the mandibles, somewhat longer than broad, a 

 little narrower in front than behind, with straight sides and slightly 

 convex posterior border. Eyes small. Clypeus very sharply carinate, 

 its anterior border entire, angularly produced in the middle. Maxil- 

 lary palpi rather long. Frontal carinae slightly diverging posteriorly. 

 Antennae long and slender; scapes very feebly curved at the base, not 

 enlarged distally, funicular joints long and the basal ones slender. 

 Thorax long, pro- and mesonotum only moderately convex, mesoepi- 

 notal constriction shallow, base of epinotum feebly convex, distinctly 

 longer than the sloping, slightly concave decUvity. Petiole narrow, 

 thick below, its anterior surface convex below, flattened above, pos- 

 terior surface flat; border rather sharp, entire or very feebly notched 

 in the middle which is slightly produced upward. Legs rather long 

 and slender. 



Opaque; body with a faint bronzy luster in certain lights. Man- 

 dibles very finely striated, with scattered, shallow punctures. Clypeus 

 and head, including the frontal area, coarsely and densely, thorax and 

 gaster a little more finely shagreened. 



Hairs whitish, long and very sparse on the clypeus, upper surface 

 of head, gula, and fore coxae; shorter and more obtuse on the gaster, 

 except at its tip; almost absent on the thoracic dorsum. Legs with- 

 out hairs, flexor surfaces of tibiae beset with a sparse row of bristles. 

 Pubescence silvery grayish, very short and dense, covering the head, 

 thorax, petiole, and gaster, even finer and shghtly sparser on the legs. 



Body black; cheeks, clypeus and legs dark reddish brown ; mandi- 

 bles, antennae, tarsi, and articulations of legs red; tip of terminal 

 funicular joint infuscated. 



Male. Length 9-10.5 mm. 



Mandibles broad, with three to four distinct teeth. Head flattened, 

 as broad as long, much narrowed in front, with straight posterior 

 border and cheeks. Eyes narrow, more than twice as long as broad, 

 very convex. Clypeus projecting, distinctly carinate only on its an- 

 terior half. Thorax and gaster robust. Petiole low and thick, seen 

 from behind with straight, entire, blunt border. Genitalia consider- 

 ably withdrawn. Wings long (11 mm.). 



Head and thorax, including the mandibles and frontal area, opaque, 

 densely punctate, the pronotum also obscurely reticulate-rugose. 

 Gaster coarsely shagreened, feebly shining. 



