labello basin purpureo maculato, callo aurantiaco; sepalo 
postico elliptico, obtuso, 11 mm. longo, 6 mm. lato; 
sepalis lateralibus tertia parte basilari inter se connatis, 
oblongo-ellipticis, acutis, 14 mm. longis, 5 mm. latis;: 
petalis late ellipticis, obtusis, 11 mm. longis, 6 mm. 
latis: labello e cuneata basi 8-lobo, lobis lateralibus sub- 
quadratis, truncatis, lobo intermedio sessill, transverse 
reniformi, antice rectangulariter late eroso: disco venis 
incrassatis ornato; callo cylindrico, antice 8-partito; toto 
labello 18 mm. longo, 21 mm. lato; columna erecta; 
clinandrio marginato; ovario pedicellato usque ad 24 
min. longo. 
Observation: In floral structure the plants of this species are simi- 
lar to O. chimborazoénse, but the barred petals and the squarely erose 
lip differentiates it immediately not only from that species but from 
every member of the whole alliance. I have seen another specimen 
referable to this species in the Kew Herbarium; it was cultivated 
during the turn of the century under the name of O. cucul/atum var. 
Oncidium chimborazoénse Stacy, sp. nov. 
Type: Ecuador, Chimborazo, 3200-8400 m. altitude. 
Coll. F.C. Lehmann no. 215! (AMES, Kk). 
K.;piphytica, ascendenti, usque ad 25 cm. alta; radici- 
bus flexuosis glabris ; pseudobulbis approximatis, oblique 
ovoideis, unifoliatis, usque ad 25 mm. altis: foliis per- 
gameneis, anguste lanceolato-ellipticis, subacutis vel ob- 
tusis, usque ad 18 cm. longis, 1 cm. latis; inflorescentiis 
erectis vel paululo arcuatis, supra laxe paucifloris; flori- 
bus ut videtur secundis; bracteis infundibuliformibus, 
ovato-triangularibus, acuminatis, 5 mm. longis; sepalo 
postico obovato-elliptico vel elliptico-oblanceolato, acu- 
to, vel abrupte subacuminato, usque ad 12 mm. longo, 6 
mim. lato; sepalis lateralibus basin inter se breviter con- 
natis, anguste ellipticis, acutis vel subacuminatis, usque 
ad 18 mm. longis, 5 mm. latis; petalis late ellipticis, 
obtusis, usque ad 11 mm. longis, 6 mm. latis; labello e 
cuneata basi 8-lobo, lobis lateralibus obliquis, apice ro- 
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