536 hi l.i i n\ mi -i.UM OF COMPARATIYI EO#LOGY. 



usual shape, rather large. Lege long, fort tomewhal swoll also 



the middle porl iona of tin' fern* 



I gs, including the ooxae, mandibles, clypeus, frontal area, Bcapes, upper 

 Burfaces of the nodes, in Borne specimens, and gaster, shining; remainder ol 

 body nearly opaque. Mandibles sharp!} and densely Btriate. Clypeui 

 longitudinally rugose. Head densely punctate and rugose, tin- rugae con- 

 centric around the antenna! foveae, coarser, diverging and more or less anas- 

 tomosing on the front, longitudinal on the Bides of the head, coarse above and 

 fine below the eyes. Thorax, petiole, and postpetiole very finely and 

 densely punctate, and with the exception ol the mesopleurae very finely and 

 indistinctly rugulose; base and declivity of epinotum very finely, transversely 

 rugulose. Extreme base of first gastric Begmenl above opaque, finely and 

 densely punctate. Legs and remainder of gaster very smooth and shining, 

 with verj sparse, minute, piligerous punctures. 



Hairs on the body yellowish, moderately abundant, coarse, and erect, not 

 longer nor more abundant on the gaster than on the head and thorax; more 

 numerous, shorter, finer, and Bubappressed on the scapes and tibiae. 



( tastaneous red; upper surface of head, except behind and in front, blackish: 

 gaster black, except its tip. The latter, the trochanters, and bases of the 

 femora more yellowish. 



Female. Length, 9-10 mm.; wings, 10-10.3 mm. 



Head, excluding the mandibles, scarcely longer than broad, distinctly 

 broader behind than in front, with distinct, though rounded posterior cornets. 

 Antennae with the scapes Lobed at the base as in the worker, but reaching only 

 about I their length beyond the posterior corners. Thorax very robust, 

 broader than the head and as high as long. Epinotum steep, with distinct 

 basal and declivous surfaces and with very stout, straight spines, which are 

 distinctly Longer than broad at their bases. Petiole and postpetiole similar to 

 those of the worker, but stouter, with their nodes more compressed antero- 

 posterior^ and each bearing a small, blunt tooth at the anterior end on the 

 ventral surface. Gaster voluminous, broadly elliptical. Wings with a 

 complete discoidal and two cubital cells. 



Sculpture like that of the worker but much coarser. Pro- and epinotum 

 transversely, pleurae, mesonotum, paraptera, and SCUtellum longitudinally 

 rugose; mesopleurae partly smooth and shining and mesonotum with a median 

 shining streak on its anterior half. Basal third of gaster opaque and densely- 

 punctate, the sparse, piligerous punctures on the remainder of the surface 

 larger and more conspicuous than in the worker. 



Pilosity like that of the worker, but the hairs more deeply yellow. 



Nearly black; mandibles, cheeks, clypeus, appendages, posterior borders 

 of gastric segments, and wing articulations, castaneous red. Wings colorless, 

 with yellow veins and dark brown pterostigma. 



Male. Length, 5-5.5 nun. 



Head small, flattened above and below, including the eyes longer than broad 

 and produced posteriorly. Cheeks very short. Mandibles with oblique 



