Dec, 1914] Cockerell: Bees From Ecuador and Peru. 309 



abdominal segments 3 to 6 showing black hair, in the manner of M. 

 rnfiventris. It is possible (considering the great range given) that 

 M. fnscipes was composite, and included (from Peru) the present 

 insect, since Friese says it is " very rarely fulvous-haired." 



Trigona frontalis Friese. 



Guayaquil {v. Buchwald; Alfken coll. 31). 



Trigona amalthea (Oliv.). 



Guayaquil {v. Buchzvald; Alfken coll. 30). 



Trigona leucogastra new species. 



Worker. — Length about 5^ mm., anterior wing 6 mm.; broad and robust, 

 shining black ; scape black, reddish only at extreme base ; flagellum obscure 

 reddish-brown beneath ; mandibles edentate, ferruginous apically ; face thinly 

 beset with short silvery hairs ; front, vertex, mesothorax and scutellum with 

 coarse black hair, not dense ; pleura with black hair above and thin white 

 pruinose pubescence below; tubercles fringed with pale (brownish-white) hair ; 

 tegulse piceous ; wings hyaline, with bright ferruginous costa and nervures; 

 legs with hair partly pallid and partly black, outer side of middle tibiae with 

 short, shining silvery hairs, under side of hind trochanters and adjacent base 

 of femora with white hair ; abdomen short, the apical segments dorsally with 

 thin but distinct white hair-bands, and the venter, except at sides near base, 

 covered with shining silvery white hair. In some specimens the flagellum is 

 quite clear red beneath. The cheeks are white-pruinose. 



Habitat. — Guayaquil, May-June, 1913, 17 workers {Brues) ; Guay- 

 aquil, 3 workers {v. Buchwald; Alfken coll. 29). 



In my manuscript table of neotropical Trigona, this runs to T. 

 cressonii D. T., from which it is easily known by the entirely different 

 color of the wings, and the pale hair on apical part of abdomen. The 

 wings agree with Lepeletier's description of his T. hyalinata, but the 

 thorax in that species is not black-haired. Superficially, T. leuco- 

 gastra looks exactly like T. cupira Sm., but that has pale face-mark- 

 ings, and lacks the pale abdominal hair-bands. The light hair on 

 under side of abdomen recalls T. postica (Latr.), but that differs 

 greatly in other respects. 



Megachile pyrrhogastra Cockerell. 



Male. — Guayaquil, May-June, 1913 (Brues). This sex is new; it 

 has the following special characters : 



