FEBRUARY, 1910.] THE ORCHID REVIEW. 35 
white, and the general resemblance to Habenaria is well known. 
Diplomeris is a small Asiatic genus, closely allied to Habenaria, in which 
the anther is so profoundly divided as to have been taken for two distinct 
anthers. 
We may conclude our account of this group by describing briefly the 
structure of the remarkable genus Bonatea, of which one or two species are 
occasionally seen in cultivation. It may be compared with a very highly 
specialised Habenaria, with which genus it is sometimes united. A cursory 
examination of one of the flowers shows a hood over the column, a pair of 
lateral sepals, the long cylindrical spur, and a group of nine narrow 
appendages in front, which are united together at the base, and might at 
first sight be taken to represent lobes of the lip. An analysis shows that 
the lip is divided into three narrow lobes, and what appear to be two 
additional lobes are the elongated front lobes of the divided petals, which 
are united to the base of the lip. The two long clavate bodies are the two 
stigmatic lobes, formed by the division of the stigma into two, each being 
carried forward on a long style, united to the lip at its base. The two 
remaining organs are the elongated side lobes of the rostellum, and at the 
tips will be seen the exerted glands of the pollinia, which are connected 
with the pollen masses by a pair of long slender caudicles, three times their 
own length, and hidden in narrow channels on the side lobes and 
connecting with the anther cells situated behind the large cucullate middle 
lobe of the rostellum. 
The flowers are fertilised by butterflies, and Mr. Weale records finding 
a small butterfly (Pyrgus elmo) perfectly embarassed by the number of 
pollinia attached to it. The method of fertilisation can easily be imitated 
by inserting a lead pencil towards the mouth of the spur, precisely as an 
insect would do on visiting the flower to suck the nectar. The pencil 
touches the sticky glands, which immediately adhere to it, and on the 
pencil being withdrawn the caudicles and pollinia are removed, the latter 
hanging suspended by their own weight. If the pencil be again inserted 
the suspended pollen masses infaJlibly come in contact with the clavate 
stigmas, and some of the packets of pollen adhere to their sticky surfaces, 
and fertilisation naturally follows. Self-fertilisation is impossible. Darwin 
pertinently remarks: ‘‘I should doubt whether any member of the 
Orchidean order has been more profoundly modified in its whole structure 
than Bonatea speciosa.” 
The subtribe Disez is another highly specialised group, and consists of 
the large and interesting genus Disa, Satyrium, and a few other small genera. 
‘It is almost entirely African, with its headquarters at the Cape, the exception 
being that two or three species of Satyrium, sometimes considered to be 
forms of one, are found in India and South China. Satyrium coriifolium 
