Minutes of Proceedings xcill 
stated that he had received almost simultaneously the same kind of 
locust from Burghersdorp through one of the members of the Society, 
Dr. Kannemeyer. This showed that the troops were more numerous 
than Mr. Paton thought, since they appeared almost simultaneously at 
places so far apart as the Hartz River and Burghersdorp. As already 
stated, the present species was very closely allied to Acridiwm pere- 
grinum, and in the same way that the last-named species had swarmed 
into Algeria after the myriads of a smaller locust (Zawronotus marocanus) 
had been destroyed at great expense, this present species was following 
in the rear of our smaller locust, the Pachytilus migratorius. The new 
locust was nearly twice the size of the other, and if its eating capacity 
was equal to its size, he pitied the colony. 
Mr, MARLOTH read some notes on 
THE FERTILIZATION OF ‘DISA UNIFLORA,’ BERG, BY INSECTS. 
The seventh volume of the Journal of the Linnean Society* contains 
a paper by Mr. R. Trimen on the ‘ Fertilization of Disa grandiflora, L.,’ 
in which the author shows by description and illustration how well 
adapted this flower is to fertilization by insects. In spite of this 
special adaptation, however, it appeared to be never, or very rarely 
only, visited by insects. 
When Mr. Bolus published his work on the ‘Orchids of the Cape 
Peninsular,’t twenty-four years later, he mentioned that Mr. Trimen 
had not observed any trace of insect agency in the meantime, and as 
the author himself had never found a matured seed-vessel, nor detected 
any insect employed in its fertilization, he thought it probable that the 
insect by which this species was originally fertilized had become 
extinct. 
The attention of botanists and lovers of flowers having been drawn 
to this question, several of them detected fully developed fruits of the 
Disa, ¢.g., Professor MacOwan, Mr. Kassner, Mr. Schlechter, and my- 
self, and Mr. Charles Ross informed me that he had found them quite 
ripe, and shaken the seeds from them. 
The occurrence of these fruits proved that this Disa was fertilized by 
insects, like other orchids; but the visitor who rendered this service 
remained unknown. 
The other day (February 8, 1895) I happened to be on the mountain 
early in the morning, and walking along a stream where some Disas 
blossomed, I noticed two large butterflies settling on a rock close by. 
* Roland Trimen, ‘On the Fertilization of Disa grandiflora L.’—Journ. Linn. 
Soc. Bot., Vol. VIT., 1864. Instead of the name D. grandiflora, L., Mr. Bolus has 
reintroduced the older name, D. uniflora, Berg. 
+ Harry Bolus, F.L.S., ‘The Orchids of the Cape Peninsula,’ 1888. 
