CENTRAL AMERICAN ORCHIDS 
long, 4-5 mm. wide, minutely tridenticulate at the subacute 
apex. Peduncle with the raceme up to 10.5 cm. long, florif- 
erous to below the middle, subfdiform, with a few dilated 
infundibuliform bracts below the raceme. Bracts of the 
raceme 2 mm. long, surrounding the rachis, brownish in 
dried specimens, hardly shorter than the pedicels of the 
flowers. Lateral sepals hyaline, about 3 mm. long, 3 mm. 
wide, united to about the middle, broadly ovate, obtuse, 
3-nerved, pale greenish. Dorsal sepal 3.5 mm. long, about 
3 mm. wide, obtuse, 3-nerved, maroon. Petals 1 mm. long, 
slightly exceeding 1 mm. in width, flabelliform, much 
thickened along the apical margin. Labellum scarcely 1 mm. 
long, 1 mm. wide near the middle, the subcuneate base 
erect and nearly parallel to the column, provided with a 
transverse callus in front of the erect portion, the apical 
portion deflexed, semiorbicular, obtuse, obliquely excavated 
or shallowly concave. Column about as long as the petals, 
dilated above the middle, with an obtuse lobe on each side 
at the summit, posterior membrane of the clinandrium ob¬ 
scurely trilobed, the lobes obtuse. 
It is distinguished in part from Stelis Bradei Schltr. by 
the shorter secondary stems and smaller leaves. It differs 
from S. rhodochila Schltr. in having twice larger flowers. In 
habit it suggests S', microchila Schltr., but is very dissimilar 
in the structure of the labellum. 
Costa Rica, La Estrella, C. H. Lankesier & Alfredo 
Sancho 438, February 3, 1923. (Type in Herb. Ames No. 
23732.) 
Pleurothallis amethystina Ames sp. nov. Radices 
fibratae, albidae. Caules secundarii abbreviati, vaginati, 
monophylli. Folium anguste oblanceolatum, obtusum, ob¬ 
scure marginatum, pedunculo brevius. Pedunculus cum 
racemo folium multo excedens. Racemus quinque ad 
quindecimflorus, plus minusve secundus. Bracteae flores 
subtendentes scariosae, infundibuliformes, oblique truncatae, 
acutae. Pedicellus cum ovario bracteis longior. Sepala 
lateralia paene usque ad apicem cohaerentia, apice bidentata, 
laminam anguste ellipticam purpureo-villosam convexam 
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