506 Mr. F. Smith's Descriptions of 



the legs and abdomen of a reddish-yellow, the scutellum palest ; 

 the thorax clothed with fulvous pubescence ; the apex of the tibiae 

 and the basal joint of the tarsi more or less fuscous ; the legs 

 have a short fulvous pubescence. The apical segments of the 

 abdomen have a thin cinereous pubescent pile ; the basal margin 

 of the segments more or less ferruginous. 



This insect closely resembles that described by St. Fargeau 

 under the name M. nijiventris, but that species has the inner orbits 

 of the eyes pale and the scutellum black. 



Genus Trigona, Jurine. 



Tongue lanceolate, usually the same length as the labial palpi, 

 rarely longer ; the labial palpi 4-jointed, the first joint twice as 

 long as the second, the two apical ones minute. 



The maxillary palpi not discernible. 



The mandibles sometimes dentate, more frequently not toothed. 



Antennae of the male 13-jointed, of the worker 12-jointed. 



Wings longer than the body; the superior wings with one elon- 

 gate marginal cell, and two sub-marginal ones ; the second ex- 

 tending to the apex of the wing ; in some species a small second 

 sub-marginal cell is faintly traced ; the sub-marginal cells rarely 

 complete, usualjy one or more not traced, sometimes all are ob- 

 literated. (PI. XX. figs. 9, 10.) 



Posterior legs elongated, the tibiae flattened and dilated. 



1 . Trigona Limdo. 



T. nigra, laevis et nitida ; mandibulis, pedibus, abdominisque basi 

 rufo-testaceis ; alis hyalinis. 



Male. Length 2| lines. Head and thorax black, smooth and 

 shining; the anterior margin of the clypeus, the labrum, mandibles, 

 and the scape of the antennae, in front, rufo-testaceous ; the fla- 

 gellum obscurely fierruginous beneath ; the tegulae and legs rufo- 

 testaceous ; the wings hyaline, with the nervures testaceous ; the 

 posterior margin of the scutellum bordered with a narrow line of 

 fine cinereous pubescent pile, a patch of the same on each side of 

 the metathorax ; the head rather wider than the thorax, the front 

 convex. The abdomen more or less rufo-piceous at the base, 

 the first segment, sometimes two and the base of the third. 

 Mandibles not toothed. 



Very readily distinguished by its broad, shining, convex head, 

 and from its being destitute of pubescence. 



