464 bulletin: museum of comparative zoology. 



of clypeus and cheeks black. Gaster with an ill-defined brown band 

 across the posterior portion of each segment. 



Worker minima. Length 5-6 mm. 



Head if times as long as broad, as broad through the anterior 

 orbits as at the anterior border, constricted behind the eyes but with 

 rounded sides to the occiput; the articular border short and nearly 

 straight. Eyes rather large and convex, their anterior orbits at the 

 middle of the head. Clypeus carinate, with broad, rather rounded 

 anterior lobe. Antennae slender; scapes terete, extending half their 

 length beyond the occipital border of the head. Thorax slender and 

 low. Petiole and legs like those of the maxima. 



Sculpture, pilosity, and color as in the maxima with the following 

 exceptions: — head smooth and shining like the thorax and of the 

 same color; scapes covered with very short subappressed hairs. 



Female. (Fig. lb). Length 10-12 mm.; wings 9 mm. 



Head very narrow, nearly 1| times as long as broad, slightly broader 

 behind than in front, with rather straight sides and occipital border. 

 Clypeal lobe rectangular, longer than in the maxima, with straight, 

 entire border. Eyes large and convex. Antennae like those of the 

 maxima but shorter though extending half their length beyond the 

 occipital border. Thorax long and narrow, regularly elliptical, 

 somewhat broader than the head; mesonotum longer than broad; 

 epinotum evenly rounded, without distinct base and declivity. Peti- 

 ole like that of the maxima, its border entire. Gaster long and narrow. 



Sculpture, color, and pilosity as in the maxima, the erect hairs on the 

 thorax shorter. Wings pale yellow, with yellow veins and ptero- 

 stigma. 



Male. Length 5-6 mm. 



Head, including the eyes, very nearly as broad as long, cheeks 

 straight, slightly converging in front, occipital region broadly rounded. 

 Mandibles small, slender, edentate. Clypeus distinctly carinate, 

 with distinct, entire anterior lobe. Antennae slender, their scapes 

 reaching nearly f their length beyond the posterior border of the head. 

 Eyes and ocelli large and prominent. Thorax broader than the head, 

 mesonotum as broad as long. Epinotum convex, sloping, without 

 distinct base and declivity. Petiole thick and low, higher behind 

 than in front, its dorsal surface flattened, subrectangular when seen 

 from above, nearly twice as broad as long and a little broader behind 

 than in front. Gaster, genital appendages, and legs slender. 



Smooth and shining, ocellar region and in some specimens the 

 mesonotum more opaque. 



