322 ANNALS NEW YORK ACADEMY OF SCIENCES 



carinate; its anterior border broadly rounded, not produced, sinuate at the 

 sides, with crenate edge. Frontal carinre lyrate, rather far apart. Frontal 

 area indistinct, extremely small ; frontal groove distinct. Antennal scapes 

 rather long, reaching about one-third their length beyond the posterior corners 

 of the head, their bases terete, neither flattened nor dilated, distal ends not 

 incrassated. Thorax slender, laterally compressed, moderately high, in profile 

 rather evenly arched above ; epinotum with indistinct base and declivity, the 

 former about twice as long as the latter. Petiole thick, with strongly convex 

 anterior and flattened posterior surface and very blunt, rounded and entire 

 niargin. Gaster of the usual form. Legs long ; middle and hind tibije neither 

 compressed nor sulcate, elliptical in ci'oss section. 



Whole body shining, very finely and superficially shagreened, more coarsely 

 on the anterior portions of the head. Mandibles coarsely and uniformly punc- 

 tate. Cheeks with small, slightly elongated foveolie, or punctures ; sides of 

 clypeus and front feebly punctate. 



Hairs yellow, erect and sparse, very short on the mandibles, rather long on 

 the border of the clypeus. absent on the sides and corners of the head and on 

 the legs and scapes, except at the tips of the latter and of the femora. Middle 

 and hind tibite with a series of short bristles on the distal half of their flexor 

 surface. Pubescence very short, dilute and indistinct. 



Yellow or yellowish red, head and gaster somewhat darker ; mandibles, 

 antennal scapes, anterior border of clypeus and cheeks very dark red or 

 blackish ; tibite and tarsi also sometimes brown or dark red. Gastric segments 

 sometimes obscurely brownish posteriorly. Mandibular teeth black. 



Woi'ker minor. Length, 7-8 mm. 



Head somewhat less than twice as long as broad, sides subparallel, slightly 

 convex, postocular portion rounded, slightly contracted towards the occipital 

 border. Clypeus similar to that of the worker major, but more truncated in 

 front. Antennae long and slender, the scapes reaching nearly half their length 

 beyond the posterior corners of the head. Sculpture, pilosity and coloration 

 like that of the worker major. 



Female. Length, 13-15 mm. 



Closely resembling the worker major, but the head has straighter and less 

 convex sides, the petiole is much compressed anteroposteriorly, with a rather 

 sharp border, which is distinctly notched in the middle above, and the color 

 of the whole body is often deeper and more brownish. Wings long (15 mm.), 

 strongly suffused with yellow ; veins and stigma brownish yellow. 



Male. Length, 8-9 mm. 



Head longer than broad, but little broader behind than in front ; cheeks con- 

 cave, subparallel, about as long as the eyes, which are moderately large. Cly- 

 peus convex, but not carinate, with broadly rounded anterior border. Mandi- 

 bles edentate, rather broad. Thorax robust, epinotum convex, without distinct 

 basal and declivous surfaces. Petiole low, thick, transverse and vei-y blunt 

 above. Gaster, antennae and legs slender. 



Sculpture, pilosity and color like those of the female, but hairs shorter and 

 less conspicuous, absent on the cheeks and thorax, except the epinotum, which 



