a pair of very small approximate semicircular calli. Col- 
umn a little shorter than the petals, arcuate, irregularly 
denticulate above, produced into a foot which has a 
prominent free cuneate-ligulate apex. 
Masdevallia pandurilabia is closely allied to the Col- 
ombian M. Arminia Reichb.f., but differs in having a 
more prominent basal lobe to the petals, a more deeply 
pandurate lip, and no angle at the base of the column, 
as well as in the color of the flowers. It varies from M. 
triangularis Reichb.f. in having peduncles much surpass- 
ing the leaf and in having a dissimilar lip. 
Hvanvco: Panao, at about 2770 meters altitude, on shrubby slopes, 
flowers yellowish brown with the “‘central lip dark red,’’ May 10, 
1923, J. Francis Macbride 3625 (Type in Herb. Field Mus. No. 534689 ; 
Dup.icate Tyre in Herb. Ames No. 595783). 
Stelis concaviflora C. Schiweinfurth sp. nov. 
Herba mediocris, caespitosa ut videtur. Caules densi, 
unifoliati, vaginis laxis tubulatis evanidis omnino celati. 
Folium saepissime anguste elliptico-oblongum, apice 
acutum, basi subpetiolato-angustatum, valde coriaceum. 
Inflorescentia unica, folio duplo longior, subdense multi- 
flora. Flores parvi, secundi, bilabiati, glabri, carnosi. 
Sepalum dorsale sepalis lateralibus alte connatum, triner- 
vium, parte libera late ovata. Sepala Jateralia in laminam 
concavo-saceatam, fere suborbicularem omnino connata. 
Petala minuta, transverse subquadrato-ovata, apice lato 
incrassato. Labellum valde concavum cum lateribus erec- 
tis, in positu naturali ovatum, dimidio basali callo carnoso 
bilobato occupato. Columna minuta, generis. 
Plant medium-sized, up to 18 em. high, apparently 
caespitose. Roots numerous, fibrous, glabrous. Stems 
densely clustered, about 7.5 cm. or less tall, loosely 
clothed with two or three tubular, scarious evanescent 
sheaths of which the uppermost is much the largest, uni- 
foliate at the apex. Leaf narrowly elliptic-oblong or ob- 
[115 | 
