Occasional Papers of the Museum of Zoology 3 



hairs). Apparently related to E. auripes is B. concava 

 (Friese), described as a variety of E. niexicana from four 

 males collected in Nicaragua. This is 19 mm. long, with the 

 clypeal keel almost obsolete. Ducke reports that it is also 

 found in Brazil (Para). 



E. brucsi was tolerably common locally. A number of in- 

 dividuals lived beneath the hut that served as headquarters for 

 the expedition. They constructed nests of wood shavings in 

 chinks between the floor and the posts that kept the hut out of 

 water at high tide, and were frequently seen bearing shavings 

 across the little clearing. Where they retired to make th2 

 shavings is a mystery, but they were not made at the nest site. 



Epicharis scuteUata Smith; — One specimen, August 20. The 

 specimen of this rare species, described from Brazil, is a 

 female. It is 22 mm. long and has tlie band on first abdominal 

 segment entire, though narrowest in middle, while segments 

 4 to 6 (except base of 4) are feruginous. There is a minute 

 cream-colored spot at apex of anterior and middle femora. 

 According to Ducke, this is the female of E. conafa Siuith, 

 which has priority. The species was common on the sand 

 balls where the forest thinned to dry. open areas of bare sand 

 and stunted trees known locally as "mouries." Here in the 

 bare sand were scores of burrows made by this bee. They 

 were about yi inch in diameter, of undeterminable depth, with 

 a small pile of sand at the entrance, and in general appearance 

 were much like a very small rodent burrow. 



Mcgalopta idal:a Smith. — One female, September 2. 

 Previously known from Brazil. 



Tri(/oiia aiualthca Oliv. (fuscipcunis Friese). — Five work- 

 ers. July I/. A common and widely distributed species. 

 Abundant on the tall, sweet lilies about camp. 



