This interesting species extends from Florida and the 
West Indies to Peru, and is here reported from southern 
Mexico. 
State of Chiapas, ““Acacogagua, Escuintla. Ago 20, 1937’, E. 
Matuda 2058. 
Bulbophyllum pachyrrhachis (4. Rich. ) Grise- 
bach F). Brit. W. Ind. (1864) 613. 
Pleurothallis pachyrachis A. Richard in Sagra Hist. 
Isl. Cub. Segunda Parte Hist. Nat. 11 (Fl. Cub. 
Fanerog. 2) (1850) 284, t. 74. 
This species, reported from Guatemala to Panamaand 
the West Indies, is now known from southern Mexico. 
State of Chiapas, ‘‘Jalapa’’ Escuintla, October 31, 1937, E.Ma- 
tuda 2056. 
Odontoglossum oliganthum Reichenbach filius in 
Bonplandia 4 (1856) 321; in Gard. Chron. n.s. 11 (1879) 
556. 
This species was apparently heretofore recorded only 
from Guatemala. The position of the lip, which seems 
to spread from the column at a right angle, suggests that 
it belongs in the genus Oncidium. 
The Matuda collection differs from the type in pos- 
sessing five flowers on its peduncle, instead of two to 
three. 
Mexico, State of Chiapas, Paso de Pasitar, August 9, 1937, E. 
Matuda 1597. 
DESCRIPTION OF NEW SPECIES AND 
NOMENCLATORIAL NOTES 
Pleurothallis aurita C. Schweinfurth sp. nov. 
Herba parva, pro subgenere gracilis, caespitosa. Cau- 
les basi decumbentes, filiformes,apice monophylli. Folium 
ellipticum vel elliptico-lanceolatum, coriaceum, apice ob- 
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