366 Descriptions and Records of Bees. 



Trigona longipes, Smith. 



I have a Brazilian specimen from F. Smith's collection. I 

 believe there is no doubt that Smith's longipes of 1854 and 

 1863 are the same insect ; hence the name longicrus, Dalla 

 Torre, falls as a synonym. 



Trigona laboriosa, Smith. 



A specimen from Smith's collection appears to me to be 

 identical with T. fulviventris, Guer., as represented by Baker 

 at Belize. T. laboriosa was described from Panama. 



Trigona guianos, sp. n. 



Worker. — Length about 7 mm. ; anterior wing about 7 mm. 



Head and thorax black ; abdomen exceedingly shiny, the 

 dorsal surface very dark brown, without hair; legs black, the 

 last tarsal joint reddish, that of hind legs clear ferruginous. 

 Head large, face broad ; sides of face greyish-white pruinose; 

 no pale markings on head or thorax ; mandibles dark reddish, 

 strongly dentate ; cheeks (except below, where they are 

 shining) densely covered with grey tomentum; clypeus and 

 front shining ; antennae black or almost above, pale ferru- 

 ginous beneath, including scape; mesothorax and scutellum 

 shining ; thorax with scanty short whitish tomentum, more 

 abundant at sides of metathorax, but vertex, mesothorax, and 

 scutellum with erect black hair ; tegulae piceous, faintly 

 reddish. Wings uniformly yellowish dusky, not dark, stigma 

 and nervures pale honey-colour. Knees slightly reddish ; 

 legs with black hair ; hind tibiae slender at base, gradually 

 widening to the broadly truncate end. 



Nab. Guiana. British Museum, 96. 238. 



T. mombuco, Sm., has the same grey cheek?, but the an- 

 tennae are dark, the posterior margin of the hind tibia is more 

 convex, and the third and fourth abdominal segments are 

 mainly ferruginous. T. fuscipennis, Friese, is also allied, but 

 differs by the dark antennae and the dark basal part of wings. 

 1 do not know how to separate fuscipennis from amalthea, 

 Oliv. ; at least an amalthea from Smith's collection seems to 

 be the same as fuscipennis from Venezuela (Kummerow) , 

 received from the Berlin Museum. 



