same form and size, the only discrepancy being in the 
degree of acuteness of the apex. In 8. peruviana there 
is no mention of a horn at the base of the petals (which 
occurs in all of the others), but this species seems surely 
identical with S§. bicornuta, even the color of the flowers 
being nearly identical. The lip seems to vary somewhat 
in size in the various species, but it appears to be of very 
similar form throughout. A rather wide diversity is de- 
scribed in the callus on the lip in the various concepts, 
but it is noteworthy that this feature appears to be often 
very variable in a single species of Sigmatostalia. 
Since, without actual specimens, it would be extremely 
difficult to recognize differences between these species, 
the wise course suggests their union. 
Ornithocephalus gladiatus Hook. var. peruvi- 
anus C. Schweinfurth var. nov. 
Planta scapis brevioribus folia non valde excedentibus, 
sepalorum mucronibus valde prominentibus, sepalo dor- 
sali quam sepalis lateralibus majore, ac praesertim labelli 
callo margines basales solum paulo superanti a specie 
differt. 
Plant small, with the general appearance of Ornitho- 
cephalus gladiatus Hook., but differing in having scapes 
shorter than or subequaling (not markedly exceeding) 
the leaves, in having a very conspicuous mucro on the 
sepals, in having the dorsal sepal somewhat larger than 
the lateral sepals, and particularly in having a less prom- 
inent and spreading basal callus on the lip which but 
slightly exceeds the margins. 
Peru: Junin, La Merced, at about 610 meters altitude, in mon- 
tania, on tree trunk, flowers white with green markings, August 10- 
24, 1923, J. Francis Macbride 5480 (Tyre in Herb. Field Mus. No. 
536520). 
