358 Drs. Dixey and Longstaff’s Observations 
which is separated by the “ Knife Edge ” from the eastern 
portion of the chasm. The path leads rapidly down into 
a wood of singularly tropical aspect, bounded on either 
hand by walls of basalt, and thence to the water's edge. 
The collecting ground is very restricted and difficult, being 
almost co-extensive with the steep path, so that the ratio 
of things taken to things seen was a low one. 
The butterfly that was most characteristic of the Kloof 
was Neptis marpessa, Hopff. ; it was distinctly common, and 
we took it nowhere else. It has the graceful sailing, stbylla- 
like flight of the genus, but is smaller than the more 
generally distributed agatha, Cram. Several males of 
Leuceronia thalassina, Boisd., were seen, all out of reach. 
They flew rather high, among the tops of the trees, and 
seemed to avoid the path.  elenois gidica, Godt, B. 
severina, Cram., and the wide-spread 3. mesentina, Cram., 
were all met with in the Kloof; the latter, a male, flew 
fast. The path through the dark wood looked the very 
place for Satyrids, but only three were met with, two 
Yphthima asterope, Klug, one typical, the other of the var. 
norma, Westw., and a shade-loving IMycalesis, of which 
Mr. Trimen says : “ near campina, Auriv., also like anynana, 
Butl., but the under-side very red.” Our old friend Papilio 
demodocus, Esp., put in an appearance. <A small, worn 
Lycenid, probably Cacyreus lingens, Cram., a male; a tailed 
blue, ? Dewdoryx sp., 2, which may possibly be new, and a 
male Zurucus telicanus, Lang, represented that group. 
Three large Geometers, two of them Conolophia conscitaria, 
Walk., the third a “Thorn” not yet determined, were dis- 
turbed from the herbage. 
The Phytophagous beetle Monolepta vincta, Gerst., was 
abundant by a spring near the bottom of the Kloof, flying 
in the sun, but might also be taken by sweeping shrubs. 
Of all the collecting grounds at the Victoria Falls, one 
naturally anticipated most from the Rarn Forest; it 
was accordingly the first, as it was the last place that we 
visited. One caution is necessary in limine: the area of 
the forest is so small, and the driest of sandy areas are so 
near, that it cannot reasonably be expected to yield valu- 
able evidence as to seasonal forms, for a butterfly captured 
within its ambit may well have gone through all its early 
stages outside and have merely entered the spray-bedewed 
area to quench its thirst. Human experience points in this 
direction; for it is difficult to imagine anything more 
