390 MR. A. B. RENDLE ON THE 
longitudinal nerves with numerous transverse veinlets, the nerve 
on each side the median one is raised at the entrance to the spur 
into a low crest. The long flexuose uniform spur is 7-8 lines 
long by 2 line in diameter. The short thick column is 1 line 
long; the large rounded auricles (1 line long) of the rostellum 
fourm the sides of the broad open scoop-like stigma. The 
subgaleate anther, 4 line broad by % line high, shows indication 
of division into two on the upper rounded plain surface. The 
beak of the rostellum after removal of the pollen-masses projects 
like a serpent’s fang ; curving upwards at the base with its pointed 
apex projecting horizontally ; it is 11 line long. The caudicle is 
roundly cuneate in shape and 1 line long. 
Approaches the West-African A. apiculatum, Hook., from 
which, however, it is at once distinguished by its shortly tipped 
lip and very long spur; the anther-cap is, moreover, not 
crested. The leaf is similar in shape to those of A. apiculatum. 
Also near another typical African species, A. avicularium, Reichb. 
f., which has a spur intermediate in length, but the flowers are 
much smaller, the slender spur is only between 4 and 5 inches 
long, and the lip narrower with a longer pointed tip. 
Mystacipium sp. 
Fruiting specimen without leaves. 
Steppes of the Thika-thika, Tana river-basin: J. W. Gregory, 
July 16, 1893. 
Vanttta Humstori, Reichb. f. in Flora, 1885, p. 378, vel aff. 
Material insufficient for more accurate determination. 
Giryama and Shimba Hills: W. E. Taylor, 1887. 
Distribution. Comoro Is. 
HABenarta (§ BoNATEA) RABATENSIS, sp. nov. Herbacea; 
caule crassiusculo infra medium folioso (foliis tribus ovalibus vel 
ovatis basi vaginantibus) supra medium laxe paucifloro; bracteis 
membranaceis acuminatis ovario pedicelloque brevioribus ; floribus 
inter majores; sepalo dorsali ovato subacuto cucullato, quam 
lateralia oblique oblonga apiculata paulo breviore ; petalis later- 
alibus bipartitis parte postica lineari sepalum dorsale sub- 
eequante eoque coherente, antica multo longiore a basi filiformi 
falcata, apice recurvo subaristato ; labelli tripartiti lobo centrali 
lobis lateralibus subsimili sed breviore, his angustis petalorum 
partitionibus anticis similibus, calcari magno crasso conspicue 
