thalhs harpophylla Reichb.f., which differs in having a 
much smaller ‘‘oblong-lanceolate’’ leaf and dissimilar 
petals. The specific name is in allusion to the habitat. 
VenezueL_a: Territory of Amazonas, Casiquiare, Rio Yatua, rare 
epiphyte in flooded forest along the uppermost part of river, at 100- 
140 meters altitude, ‘‘corolla purple with yellowish spur,’” December 
7-8, 1953, Bassett Maguire, John J. Wurdack and George S. Bunting 
36730 (immature leaves elliptic). —Same date and flower-color, De- 
cember 12, 1953, Maguire, Wurdack & Bunting 36763.—Along upper- 
most Rio Yatua above the mouth of Rio Yacibo, at 100-140 meters 
altitude, ‘‘perianth maroon, the long narrow member cream,’’ Janu- 
ary 30-31, 1954, Maguire, Wurdack & Bunting 37430.—A\lso Bolivia 
(type) and Brazil. 
Pleurothallis parvilabia C. Schweinfurth sp. nov. 
Herba magna, epiphytica, vagans. Caules superpositi, 
graciles, usque ad 24 cm. longi, unifoliati, vaginis atro- 
pubescentibus arcte velati. Folia anguste lanceolata vel 
elliptico-oblonga, ad apicem minute tridenticulatum sen- 
sim angustata, basi cuneata sessilia, circiter 8-12.7 cm. 
longa, usque ad 1.5 em. lata, subcoriacea. Flores plures, 
axillares, parvi, membranacei, bilabiati, virides et pur- 
purei. Sepalum dorsale valde cucullatum, expansum 
elliptico-lanceolatum, acuminatum, quinquenervium, 
positu naturali circiter 7 mm. longum, expansum 3.2 
mm. latum. Sepala lateralia in laminam late elliptico- 
ovatam prope medium bidentatam connata; sepalum 
utrumque obliquissime ovatum, acutum vel acuminatum, 
quadrinervium, circiter 6 mm. longum et 2.9 mm. latum. 
Petala inferne usque supra medium obovato-ligulata, 
apice utrinque paucidentata, deinde e basi triangulari in 
apicem carnosum longe aristata, trinervia, circiter 5.6 
mm. longaet prope medium 2 mm. lata. Labellum seg- 
mentis ceteris multo minus, in positu naturali suborbicu- 
lare, recurvum et 1.9 mm. longum, expansum circiter 2 
mim. latum, late obtusum, dorso per medium carina car- 
nosa ornatum, marginibus basi apiceque exceptis multo 
[ 14 ] 
