Records of Bees. 313 



Trigona argyrea, sp. n. 



Worker. — Length slightly over 3 mm. 

 Black, including antennae and legs, but abdomen (which is 

 short and rather broad) shining dark sepia-brown; head large; 

 face up to antennae flattened, densely covered with short, ap- 

 pressed, brilliantly silver hair; mandibles edentate, black with 

 the apical margin rufous ; cheeks small ; front shining, the 

 upper part with rather large sparse punctures, as they appear 

 under a lens, but the microscope shows that they are the bases 

 of black bristles ; vertex with black hair ; posterior ocelli very 

 close to occipital margin ; thorax narrower than head, without 

 light markings, the dorsum shining, with black hair, the 

 mesothorax also with very short strongly plumose pale hairs; 

 pleura with pale hair ; sides of metathorax minutelj'^ pale- 

 tomentose ; hair of legs largely black, but white hair on 

 underside of middle trochanters and basal half of their femora 

 (hind legs broken off in type) ; wings dusky, nervures and 

 stigma dark sepia; tegulae rufo-piceous ; underside of 

 abdomen pale ochreous. 



Hab. Quirigua, Guatemala, one {IV. P. Cockerell). The 

 specimen is labelled '^ nest in clay bank,'' where it was 

 taken along with a couple of T. cupira, Smith. 



This may be compared with T. hjaVmata, Lep., and T. tubibu., 

 Smith ; differing from both by its very silvery face, from 

 hyaUnata also by the smaller size, and from tubiba by the 

 shining front and mesothorax (these parts in tubiba are 

 absolutely dull). T. argentata, Lep., has silvery hair on face, 

 but the wings are clear. 



Trigona zexmenicB, sp. n. 



Worker. — Length 7^ to 9 mm. 



Robust, abdomen parallel-sided, not quite so broad as thorax; 

 head and thorax dull black, but the clypeus and supraclypeal 

 area shining and strongly punctured ; labrum ferruginous, 

 more or less bigibbous ; mandibles rufo-piceous, edentate, the 

 broad apical margin sharply marked off and ornamented with 

 elongate punctures ; malar space rather large ; no light face- 

 marks ; front dull and densely granular, as also are the meso- 

 thorax and scutellum ; antennae black, with the scape red at 

 base and extreme apex, and flagellum dark reddish beneath ; 

 hair of head and thorax above scanty and black, longest on 

 scutellum ; edge of mesothorax above tegulae with a narrow 

 dull yellow stripe ; hair of pleura mostly black, partly pale 

 below ; tegulae piceous or rufo-piceous. Wings dusky, with a 

 cfc Mag. N. Hist. Ser. 8. Vol. x. 22 



