North American Hymenoptera. 



415 



hardly perceptible nervures ; ultimate cellules hardly 

 attaining to the tip of the wing; the second receiving the^ 

 recurrent nervure : feet not different in color from the 

 body ; posterior tibiae with the ciliae of the edge sparse. 



Lenirth less than one fourth of an inch. 



\Ji 



Lair, of which the posterior tibiae are densely ciliated. I 

 am indebted to Dr. Klug for a specimen of the rujicrus ; 

 and it is very different from the amalthea and sjpimpes, 

 Fabr. My specimens are workers, and I did not find the 

 nest or ascertain the kind and importance of the honey 

 they make. The generic name is almost too much like 

 Trigonia of Conchology, but as the pronunciation differs 



it can remain. ' 



2. T. Ugata. O Blackish ; abdominal segments mar- 

 gined with och'reous. 



Inhab. Mexico. 



r 



Body brownish-black, hairy : antenn<z beneath, parti- 

 cularly the basal joint, anterior half of the anterior orbits, 

 line distinguishing two lobes of the hypostoma and mouth, 

 dull yellowish : wings slightly tinged w^ith fuliginous, par- 

 ticularly towards the base; nervures of the cubital cellules 

 like those of the hilinedtay Nob. but the first one is much 

 more distinct : tergum shortly hairy; posterior margins 

 of the segments ochreous : feet dull honey-yellow ; tip 

 of the posterior tibiae and base of the first tarsal joint 



black. 



Length about two fifths of an inch. 



Of this I obtained but a single specimen, which is a 

 worker. It is widely different from the preceding species, 

 particularly in being hairy^ and is much larger and of a 



somewhat different habit. I have carefully compared it 

 with Latreille's descriptions and figures of Melipona 



m 



