48 Psyche [April 



ventris, were it not that the two specmiens are quite alike, while a 

 rufiventris from Abuna exactly agrees with one from F. Smith's 

 collection, now in my possession. There is accordingly some evi- 

 dence of stability in the comparatively slight characters noted. 

 The name of the species is derived from the fact that superficially 

 it is exactly like a red Centris, such as C. tarsata Smith. Ducke 

 asserts that M. mixta Lep. is the same as rufiventris, but Lepele- 

 tier says the hair of the head and thorax in mixta is black. Ducke 

 also makes M. fulva Lep. a synonym of rufiventris, but according 

 to a specimen before me, from F. Smith's collection, it is quite 

 distinct; the legs, as Lepeletier describes, are fulvous, the hind 

 tibise without black markings, although the anterior and middle 

 tibiae are strongly infuscated. In rufiventris the hind tibiae are 

 red with about the apical half black, and there is long black hair 

 on the posterior margin. 



Melipona abunensis sp. nov. 



Worker Length 10 mm. or slightly more; head, thorax and legs black, the large 

 apical tarsal joints dark red; abdomen chestnut red, without bands; head broad; 

 clypeus bare, dullish, minutely roughened, with a feebly indicated median dark 

 red stripe; mandibles black, edentate; malar space large; sides of face bare; scape 

 black, red at extreme base; fiagellum reddish beneath; vertex with long black hair, 

 occiput with light fulvous hair; mesothorax shining black, more than the posterior 

 half bare, anterior part with long black hair, with shorter pale hair intermixed; 

 scutello mesothoracic suture with black hair in front and pale behind; scutellum 

 prominent, wholly black, apically with a tuft of long black hair, but the hind mar- 

 gin with long pale fulvous hair; sides of metathorax with pale hair; hair of pleura 

 pale anteriorly, but black below wings; anterior femora fringed with whitish hair 

 behind, their tarsi with red hair on inner side; the broad hind tibite fringed with 

 black hair; tegulae ferruginous; wings orange-ferruginous, with ferruginous nervures; 

 hair of apical part of abdomen mainly ferruginous, but some dark hair at sides of 

 the last three segments ; first abdominal segment with a black spot on each side. 



Hab. — Abuna, Rio Madeira, Brazil (Mann & Baker). The 

 general appearance is like an overgrown M. mandacaia Sm., with 

 the abdomen much brighter red. On more detailed comparison 

 there are many differences, as in the color of the legs and base of 

 abdomen. 



Trigona manni sp. nov. 



Worker. Length Tj-Q mm., the wings about 8 mm.; rufotestaceous, the head 

 black, marked with very pale yellow, and the mesothorax black or piceous, mar- 



