476 bulletin: museum of comparative zoology. 



frontal area, more shining. Mandibles densely striated and coarsely 

 punctate. Legs and gaster shining, the latter delicately and trans- 

 versely shagreened, with the same pecuHar luster as in F. truncicola 

 obscuriventris. 



Hairs golden yellow, short, obtuse, suberect and very sparse on the 

 upper and lower surfaces of the head, thoracic dorsum, and gaster. 

 Legs without erect hairs on the extensor surfaces; antennal scapes 

 occasionally with a few short hairs on their anterior surfaces. Eyes 

 hairless. Pubescence whitish, very short and sparse, visible on the 

 antennae, pleurae, and gaster, but not concealing the shining surface 

 of the gaster. 



Mandibular teeth and gaster black; remainder of body and appen- 

 dages deep red; antennal funiculi, legs, especially the tibiae, mandibles, 

 and anterolateral corners of the head, darker and more brownish. 

 Ocellar region and mesonotum slightly infuscated even in large 

 workers, but there is no increased tendency to infuscation in the 

 smaller workers. 



Female. Length 4-5 mm. 



Mandibles and clypeus like those of the worker, except that the 

 latter is more convex and less prominently keeled. Head slender, 

 without the mandibles distinctly longer than broad, with long, 

 anteriorly converging cheeks. Thorax distinctly nai rower than the 

 head. Petiole similar to that of worker but with sharper superior 

 border, often slightly notched in the middle. Gaster small. Legs 

 slender. Wings somewhat longer than the body (5.3 mm.). 



Body smooth and shining, very finely shagreened, posterior portion 

 of head and mesonotum more opaque; gaster very glabrous, being 

 much more delicately shagreened than in the worker. 



Hairs golden yellow, suberect, slender, pointed, much longer than 

 in the worker and more abundant, especially on the upper surface of 

 the head and thorax. Legs with rather long, scattered, subappressed 

 hairs. There are a few conspicuous erect hairs on the anterior surface 

 of the antennal scapes, on the gula and border of the petiole. On the 

 gaster the long hairs are sparse and arranged in three regular rows on 

 the first and second, in two rows on the succeeding segments. 



Mandibular teeth and gaster black, remainder of body dull yellowish 

 red. Antennae, legs, posterior portion of head, mesonotum, scutellum, 

 and metanotum decidedly darker. The anteromedian and parapsidal 

 blotches are faintly indicated on the mesonotum. Wings rather 

 opaque, grayish hyaline, with fuscous veins and black stigma. 



Male. Length 6.5-7 mm. 



Mandibles pointed, edentulous. Head short, broadest through 

 the eyes, which are large. Posterior corners broadly rounded; cheeks 

 short, flattened, converging in front. Clypeus carinate in front, 

 depressed behind. Thorax just in front of the wings hardly broader 



