Bulbophylliim macranthum , and allied Orchids . 335 
escape of the fertilizer, and als6 I believe to put an obstacle 
in the way of its obtaining the nectar on the lip from the side 
of the flower. The lip in both is conspicuously coloured, at 
least if the flower is at all coloured. The balancing principle 
is the same in both ; but in Cirrhopetalum it is more perfectly 
arranged, since being nowhere in apposition with any other 
part of the flower, it is necessary that the fertilizer should 
trust itself wholly to the lip in order to get at the nectar 
with its short tongue, and also, for the same reason, there 
is no risk of friction with the petals or lateral sepals, so that 
the mobility is not at all impaired. 
The flowers, especially the thinner-textured ones, last from 
24 to 48 hours only in a fertilizable state, after which the 
lip becomes stiff and does not work properly. It is, however, 
rare for any orchid flower to survive the second day in its 
native haunts here ; under any circumstances it will be effete 
forty-eight hours after opening, and usually in a very much 
shorter time. 
In conclusion, taking the whole group of Bulbophylleae, 
including Cirrhopetalum , I do not doubt but that they are 
intended altogether for Dipterous fertilization. There is 
always a tendency to that dark red colouring so much asso- 
ciated with plants attractive to flies, as Amorphophallus , 
Raffle sia, Arum . The nectar too is not placed in a sac or tube, 
but on an open flat body, and is exuded in small quantities, 
so as to be easily licked off by Diptera. The nearly allied 
genus Dendrobium , on the other hand, is adapted for Bee- 
fertilization, and consequently the arrangement, structure, 
and colouring of the flowers are quite different. 
B. striatellum , nob. Planta pusilla, rhizomate filiformi tenui 
longe repente. Pseudobulbi curvi, conici, pallide virides, vix 
\ unc. longi, J unc. dissiti. Folium erectum, lanceolatum, 
acutum, 2 unc. longum, J unc. latum, subtenue. Scapus 
filiformis, pseudobulbo vix superans, vaginis 1—2 ad basin. 
Flos terminalis, parvus, clausus, nutans, pedicello unciali 
rubro. Sepala similia, oblonga vel oblongo-flanceolata, cau- 
data, flava carinis tribus rufis, semi-unc. longa. Petala 
z 
