Of the generic groups constituting the orchid flor: 
of Middle America, the following have not as yet been 
found in Honduras: (1) Cypripedileae, (2) Cephalan- 
thereae, (3) Tropidieae, (4) Zygopetaleae, (5) Trichocen- 
treae, (6) Telipogoneae, (7) Pachyphylleae. The Cypri- 
pedileae are without representatives in the area formed 
by Guatemala, British Honduras, Salvador and Nicara- 
gua, Of the three genera of the Cy pripedileae represented 
in Middle America,Selenipedium is confined to Panama, 
Phragmopedium to Panama and Costa Rica and Cypri- 
pedium to Mexico. This peculiarity of distribution takes 
on added significance when it is borne in mind that with 
the exception of a single species in Trinidad, the Cypri- 
pedileae are without representatives in the West Indies. 
Only one species of the Cephalanthereae has been reported 
from Middle America. This is Mpipactis gigantea Doug. , 
a species not known to occur south of Mexico. The 'Trop- 
idieae, represented by two species, should oceur in Hon- 
duras and will probably be found there as Corymborchis 
Jlava (Sw.) O. Ktze. is a native of Nicaragua, Salvador, 
British Honduras and Costa Rica and 7'ropidia polystach- 
ya (Sw.) Ames has been reported from Guatemala and 
Costa Rica. The Zygopetaleae are represented in Mid- 
dle America by a single species, namely Ga/eottia grandi- 
Hlora A.Rich. which is at present only known from 
Mexico and has been reported from Costa Rica. The 
Trichocentreae, represented by about ten species of l'ri- 
chocentrum, have as yet been reported only from Mexico, 
Guatemala, Costa Rica and Panama. The Telipogonene, 
represented in Middle America by approximately eight 
species, are not found north of Costa Rica. The Pachy- 
phylleae, preponderantly South American, are at present 
known only from Middle America through Centropetalum 
costarwense A.&S. and Pachyphyllum muscoides (I< riinzl. ) 
Schitr., natives of Costa Riea. 
[x2] 
