2 University of Michigmi 



smaller, with the ocelli not so close together, and the meso- 

 Ihorax more closely punctured. 



Bitglossa cordata (L.).— One specimen, August 2. A wide- 

 ly distributed species. 



Enkcma bntcsi Cockerell. — Four females and two males, 

 August 2. The female exactly agrees with the type of B. 

 bnicsi from Gua\aquil, Ecuador. The male, not before known, 

 has the front and sides of face brilliant green ; the meso- 

 thorax (nearly hidden by black hair) and the tegul?e green; 

 the first abdominal segment purplish, not pure black, with black 

 hair; concealed part of second segment dark; clypeus with a 

 large oval depressed space, having raised margins, and through 

 the middle of this a strong keel. In structure and general 

 characters this agrees closely with B. niexicana Mocsary, but 

 the pronotum is entirely black haired, as is the whole of the 

 thorax, and the swollen hind tibiae have a brilliant shining 

 green area behind. The size is also greater, about 20 mm. 



Ducke remarks that the B. smaragdiiia group is insufficient- 

 ly known, and suggests that perhaps various species have been 

 confused. This seems to be the case. The neotropical 

 Xylocopa and Oriental Crocisa have similarly been supposed 

 to consist of relatively few very variable species, but when 

 good series of the several forms are obtained, it is se.n that 

 they are constant, the supposed variability being due to the 

 mixing of dififerent things from various localities. 



Bnh.cma auripcs (Gribodo), based on a male, 21 mm. long, 

 from Cayenne, difi^ers from the male of bnicsi in the subob- 

 solete median carina of tlie clypsus, the golden hair on the 

 middle tibia and basitarsi ; ( in B. bnirsi black on middle tibiae, 

 dense and shining cream-color on outer side of basitarsi), and 

 the golden hair on outer side of hind tibiae (this part in B. 

 brucsi bare, witli only very minute incons])icuous scattered 



