50 Psyche [April 



tibise, and the margins of the wings broadly smoky; the head also 

 must be different. 



Trigona frontalis flavocincta subsp. nov. 



Worker. Like T. frontalis Friese, but the pale markings of the thorax Hght yel- 

 low instead of white; all the femora and anterior and middle tibiie and tarsi, clear 

 ferruginous. Length 3 mm. 



Hab. — Independencia, Parahyba, Brazil {Mann & Heath). 

 Friese described T. frontalis from Honduras, without citing any 

 precise locality or collector. Professor C. F. Baker kindly sent 

 me four which he collected at Chinandega, Nicaragua. Some of 

 the same lot, he informed me, were determined by Friese. 



Trigona pellucida sp. nov. 



Worker. Like T. amalthea (Oliv.) except that the wings are clear, somewhat 

 milky, with the apex a little dusky, the stigma and nervures bright clear ferrugi- 

 nous; abdomen sepia-brown basally; hind tibia reddish, but dark; small joints of 

 tarsi deep ferruginous. Length 5^ mm., anterior wings 5. Mandibles dentate, 

 obscure reddish at apex. Dorsal surface of abdomen distinctly keeled. 



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

 This seems to be related to T. amalthea as T. flavipennis Friese 

 is to T. rvficrus. Possibly both represent mutations. 



Trigona branneri sp. nov. 



Worker. Length 6j mm., anterior wing 6|; like T. guianop Ckll., but smaller, 

 with the wings only very faintly dusky, with a yellow stain in the base of the mar- 

 ginal cell and along the subcostal and basal nervures; abdomen shining black; 

 short t omentum of thorax above dark fuscous, hardly noticeable; mandibles dark 

 castaneous, dentate. The series of eight is quite uniform in appearance. Com- 

 pared with T. ruficrus, it is at once knowTi by the pale wings, and the black hind 

 legs; compared with T. amalthea, it is larger, with pale wings, and the scape and 

 flagellum both chestnut red beneath. The wings, although pale, are dusky com- 

 pared with those of T. 'pellucida. I might think T. branneri to be T. flavipennis 

 Friese, but Friese says the posterior tibise of his species are more or less fulvous, 

 which is not true of ours. A species which superficially looks just like T. branneri 

 is T. postica (Latr.), but postica has a dull abdomen (except the extreme bases of 

 the segments), with two patches of hght pubescence on the fifth segment, and also 

 a finely rugose punctate mesothorax. 



Hab. — Manaos, Brazil, eight {Mann & Baker). 



