ON SOME BORNEAN SPECIES OF TRIGONA (aPID^). 193 



5 (4). Apex of clypeus, mandibles, antennal 



scape testaceous, apical joints of tarsi 



rufous ...... erythrostoma, Cam. 



6 (1). Body not all black. 



7 (17). Head black. 



8 (14). Thorax black. 



9 (12). Abdomen dark rufous. 



10 (11). Thorax densely covered with fulvous 



pubescence ; base of cubitus straight, 



oblique ...... fulvoijilosella, Cam. 



11 (10). Thorax covered sparsely with short 



black pubescence ; the base of cubi- 

 tus roundly curved .... erythrogaster, Cam. 



12 (13). Abdomen black in the middle, the base 



and apex pale yellow ; the femora 



testaceous ..... latihalteata, Cam. 



13 (12). Abdomen pallid yellow, with pale fus- 



cous bands ; legs black . . . fitsco-balteata, Cam. 



14 (8). Thorax testaceous. 



15 (16). Apex of wings lacteous, legs for the 



greater part black ; the thorax densely 



covered with fulvous pubescence . lacteifasciata, Cam. 



16 (15). Wings clear hyaline, legs testaceous, 



thorax with pale pubescence . . testaccinerva, Cam. 



17 (7). Head testaceous. 



18 (19). Large ; hind tibiae and tarsi black ; 



wings yellow in front ; stigma yellow flavistigma, Cam. 



19 (18). Small; legs pale yellow ; stigma pale pallid istigina, Gi^m. 



Trigona erythrostoma, sp. no v. 



Black ; the apex of clypeus, the apex of mandibles broadly, and 

 the apical four joints of the tarsi rufous ; wings hyaline, slightly 

 suffused with fuscous, the nervures and stigma black ; the sides of 

 front, apex of mesonotum, scutellum, mesopleurge, mesosternum, 

 metapleurse, and the metanotum covered with white pubescence ; the 

 rest of the head, thorax, and abdomen with longer, stiffer black 

 pubescence ; the pubescence on the coxae and trochanters white, on 

 the femora and tibiae black, on the tarsi white mixed with black ; the 

 four front trochanters and the basal joint of the anterior tarsi are 

 rufous ; the fore spurs of a paler rufous colour. Tegulae black. 

 ^ or ? . Length, 4 mm. 



Kuching, Borneo (John Hewitt). 



Smooth and shining. Basal abscissa of cubitus very little bent 

 or angled ; beyond the recurrent nervure (which is also very faint) it 

 is almost obliterated. The scutellum rises obliquely from the base to 

 the apex ; the apical slope is oblique, projecting at the top over the 

 lower part. The hind tibiffi become gradually dilated from the base 

 to the apex, The under side of the antennal flagellum is brownish. 

 The stump of the cubitus issues from the middle of the cul^ital 

 abscissa. 



