scarcely reach beyond the middle of the stems (not al- 
together concealing them, as stated). The spathe which 
embraces the peduncles is about 1.5 em. or less long, 
whereas it is 2 cm. long in Valpinaria bivalvis. The 
flowers are slightly smaller than those described in 7‘ 
bwalvis, while the petals are markedly shorter than the 
sepals and not almost equaling them as in 7° bivalvis. 
Lip and column, from side, ten times natural size. 
Lip, from above, natural position, ten times natural size. 
Judging by a careful examination of the type collec- 
tion of Pleurothallis trimeroglossa, the lip has been inter- 
preted incorrectly by both Karsten and Schlechter. The 
lower half of the lip has a high flattened pubescent cen- 
tral keel enclosed by a pair of erect conduplicate semior- 
bicular-lunate lobes which are lacerate-fimbriate in front 
and recurved; the anterior half is elliptic, or flabellate 
when expanded, and is prominently tridentate in front. 
The origin of T'alpinaria bivalvis was said to be Colom- 
bia and Venezuela, while Pleurothallis trimeroglossa came 
from the Department of Junin in Peru. 
Pleurothallis tenuis C. Schweinfurth sp. nov. 
Herba parva, caespitosa, epiphytica. Caules graciles, 
simplices, unifoliati, vaginis paucis infundibuliformibus 
[ 190 | 
