246 HYMENOPTERA. 



entirely shiny, in tescorum the hind margins of the segments 

 are dull and granular, and the apical ones being retracted, 

 the whole apical end of the abdomen appears dull. The 

 hair on inner surface of hind basitarsus is dark, whereas in 

 clypeata it is clear ferruginous. The flagellum is reddish 

 beneath toward the apex, and the tegulae are piceous. Under 

 the microscope the mesothorax in both species shows a fine 

 densely malleate sculpture, but although tescorum is the 

 larger, the sculpture is very much finer than in clypeata. 



Hab. — Benguella, Africa {Wellman, 1471). Wellman's 

 1243, from the same locality, is T. gribodoi Magr. 



Trigona topiorum sp. nov. 



Worker. Length about 6 mm., short and broad, black, marked 

 with lemon-yellow ; face very broad, front dull and minutely granular, 

 supraclypeal area and lower parts of face shining ; front, vertex, 

 labrum and base of mandibles with dark reddish hair ; mandibles 

 ferruginous, yellow at base, with a long straight cutting edge, and two 

 little long-triangular teeth at the inner apical corner ; yellow markings 

 of head consisting of a spot behind base of mandibles, a narrow stripe 

 along anterior orbits, failing above, and a suffused mark on each side 

 of clypeus below ; scape with a red stripe, including most of base, and 

 narrowing apically ; flagellum obscurely reddish beneath ; hair of 

 thorax ferruginous, rather abundant ; mesothorax and scutellum dull 

 and granular; a yellow stripe runs along each side of mesothorax, in- 

 cludes axillae, and becoming about twice as broad, margins scutellum, 

 leaving the latter with a black semi-circular area ; prothorax above 

 (interrupted in middle) and tubercles yellow; tegulae clear rufo- 

 testaceous ; wings yellowish, dusky hyaline, stigma and nervues ferru- 

 ginous ; b. n. meeting t. m. ; two well defined submarginal cells; legs 

 black, small joints of tarsi ferruginous, a dull yellow mark at base of 

 anterior femora, and a spot at base of middle ones ; hair on inner side 

 of hind basitarsus fox-red ; abdomen short and broad, piceous, not 

 hairy, with variable light yellow lateral spots, that on second segment 

 large and subquadrate ; no bands. 



Runs in Friese's table to 13, and runs out because the 

 mesonotum is yellow margined and the abdomen is not red. 

 Nearest, I think, to T. conradti Friese, but differing in many 

 details. (I have compared an authentic conradti, collected 

 by Conradt.) 



Hab. — Benguella {Wellman H 92). Two specimens. 



