1912] Cockerell — New Bees from Brazil 51 



Trigona spp. 



Twenty-three specimens from Porto Velho, Abund and Madeira- 

 Mamore R. R. Co. Camp 41, represent at least three species of 

 the amalthea group, which I do not at present attempt to describe. 

 It appears that in this group of Trigona there exist numerous very 

 closely allied races or species, but at present it is difficult to define 

 them or to decide whether they are really distinct from various 

 previously published members of the genus. They should be col- 

 lected, like ants, in large numbers from individual nests. 



Coelioxys ardescens sp. nov. 



Male. Length 10 mm. or slightly over; black, with the tegulse and legs bright 

 ferruginous; hind tarsi black, abruptly contrasting with the red tibiae; first abdom- 

 inal segments, and sides and extreme base of second and third, dark red; ventral 

 surface of abdomen wholly dark red, with white hair-bands; eyes brownish-gray, 

 with very short hair; mandibles red, black at apex; lower part of cheeks and base 

 of mandibles with very dense pure white hair; face and front densely covered with 

 silky pale fulvous hair; vertex flattened, strongly punctured, with very short and 

 scanty black hair; antennae entirely black; mesothroax shining, with very large 

 scattered punctures; an undulating band of hair along front of mesothroax, a stripe 

 (enlarging posteriorly) at sides, and two transverse patches in scutello-mesotho- 

 racic suture, all lively fulvous; hair of under side of thorax white; scutellum smooth, 

 impunctate in middle, with lai'ge punctures at sides, apex angularly produced 

 and slightly upturned; axillar spines rather short; wings hyaline, faintly dusky, 

 the apical margin broadly dusky; stigma ferruginous, nervures fuscous; anterior 

 coxal spines short and stout; tibial spurs red; abdomen shining, first segment 

 rather sparsely punctured, the others largely impunctate in middle, except at base 

 and apex; first segment with an entirely uniform, narrow yellowish hair-band; 

 third to fifth with subdorsal transverse stripes of grayish tomentum, and second 

 to fifth with apical hair-bands at sides only; sixth segment elongate, deeply and 

 broadly sulcate in middle, with a long sharp spine on each side near base, the four 

 apical spines sharp, the lower somewhat the longest; venter sparsely punctured, 

 with very faint indications of a keel. The scutellum shows no trace of a keel. 



Hab. — Porto Velho, Rio Madeira, Brazil {Mann & Baker). 

 Of the genus Coelioxys no less than 94 neotropical species have been 

 described, but I cannot identify this with any of them. It appears 

 to be close to C. laevigata Smith, from Para, but the angular apex 

 of the scutellum of our species can hardly be called "a broad 

 spine," while the account of the abdominal banding does not at 

 all agree. In Schrottky's table in his Catamarca paper (1909) 

 C. ardescens runs to C. edentata Schrottky, and agrees well in several 



