Records of Bees. 387 



Trigona rufibasalis, sp. n. 



Worker. — Length a little over 6 mm. 



Rather slender, but the head broad. Black, witb the 

 mandibles dull red at apex, and tarsi red at apex; face with 

 very thin greyish pile; front polished and shining; scape 

 bright ferruginous ; flagellum dark, reddish at extreme 

 base, and red beneath at apex ; mesotliorax shining, without 

 distinct impressed lines; liair of thorax above black but 

 scanty; tegulte piceous. Anterior wings with the basal half 

 orange-ferrugiuous, the apical field clear; hind wings dusky 

 throughout. Hind tibire not very broad for the genus. 

 Abdomen shining black, venter with bands of black hair. 



Sandakan, Borneo {Baker, 9225). 



Somewhat related to T. collina, Sm., and T. vidua, Lep., 

 but the wings are differently coloured, and the head and 

 thorax are shining. 



The above species of Trigona were received from Prof. C. 

 F, Baker, with others from Sandakan, Borneo, and Singa- 

 pore. The following key separates and records all the 

 species represented in the series : — 



Clear ferruginous. (Sandakan.) melina, Gribodo. 



At least the thorax or abdomen dark 1. 



1. Mesothorax red, sometimes dark 2. 



Mesotborax pure black 3. 



2. Face pale or red up to level of antennae. (San- 



dakan.) apiculis, Smith. 



Only clypeus red. (Sandakan and Singapore, 

 the malar space a little shorter in the Singa- 

 pore form.) ambusta, Ckll. 



3. Tegulse clear testaceous; abdomen brownish. 



(Singapore.) pallidicincta, Ckll. 



Tegulse darker 4. 



4. Large species, with reddish clypeus, and wings 



basally orange-fulvous. (Sandakan.) melanotricha, Ckll. 



Smaller ; or if rather large, clypeus black .... 5. 



5. Scape black, except at extreme base; larger 



species 6. 



Scape fen-uginous; smaller species 7. 



6. Wings dilute fuliginous. (Singapore.) .... itama, Ckll.- 

 Wings not fuliginous. (Sandakan.) busara, Ckll. 



7. Wings strongly reddened basally, apically 



hyaline. (Sandakan.) rufibasalis, Ckll. 



Wings greyish hyaline 8. 



8. Larger ; abdomen broad. (Singapore.) .... geissleri, Friese. 

 Smaller ; abdomen narrow. (Singapore.) .... valdezi, Ckll. 



Megachile penangensis, sp. n. 



$ . — Length about 11 mm. 

 Face below level of auteunse with black hair, front and 



