TROPICAL AMERICAN ORCHIDS 
inate at the apex, 5-nerved. Dorsal sepal similar, not ob¬ 
lique, abruptly acute and thickened, concave near the apex. 
Petals linear-subspatulate, about 8.2 mm. long, 2.4 mm. wide 
above the middle, rounded or subtruncate at the apex, 
gently curved at the oblique base, 3-nerved. Labellum cu- 
cullate-involute in natural position, subequaling the sepals, 
constricted below the middle; lower portion saccate, hemis¬ 
pherical, furnished with a pair of large subspherical approxi¬ 
mate calli, bounded in front by a transverse thickened 
bidentate wall; anterior portion larger, when expanded sub- 
orbicular, emarginate, with irregularly lacerate margins. 
Column stout, about 6.8 mm. long, curved, dorsally rounded 
in cross section, anterior face concave with a median elevated 
ridge. 
Elleanthus tricallosus is allied to E. Brenesii Schltr., but 
differs in its erect few-flowered racemes and bidentate cal¬ 
lus in front of the saccate base of the labellum. Its un¬ 
branched stems differentiate it from £. Tonduzii Schltr.; its 
flowers are apparently very like those of E. Albertii Schltr, 
52 
