354 Drs. Dixey and Longstaff’s Observations 
peaceful landscape. Another large and handsome species, 
Pseudomacromia torrida, Kirby, with a pair of sapphire- 
like spots behind the eyes, was common, as was also the 
smaller Pseudagrion deckeni, Gerst. Besides these were 
other Dragonflies not yet named. 
A Myrmeleon sp. was noted as being the colour of dried 
grass. Some “white ants” were taken, but, so far as our 
observations went, Termites are not as common at the Falls 
as in other parts of South Africa that we visited. 
Very little attention was paid to Diptera, partly perhaps 
because, fortunately, they did not pay the usual amount of 
attention to us; only two were brought home, Sarcophaga 
sp. and Hxematopota sp., the latter taken on the “topi”’ of 
the captor. 
Of the Aculeates the most striking were the Carpenter- 
bees, of which the commonest was Yylocopa divisa, Klug, 
found at Combretum, or other flowers, though one, a male, 
was noted as hovering persistently about a tree overhanging 
the river. The male of this bee is of a beautiful “old- 
gold” colour ; of this sex only two were taken, but females, 
of the variety with the band on the back of the thorax 
white in place of “old-gold,” were commoner, and four or 
five specimens were secured. Of 1. caffra, Linn., we took 
two specimens, both females of the variety mossambica, 
Grib., with a white ring in place of the usual two yellow 
rings. Of XY. olivacea, Fabr., we got but a single female. 
We met with three species of the very slender-waisted 
wasps of the genus Ammophila, viz. :—A. ludovica, Smith, 
a female, and A. beniniensis, Pal. de Beau., a male, both at 
wet mud, while a female of A. ferrugineipes, Lepel., was 
taken at flowers. Of the large and handsome black and 
yellow Sceliphron spirifex, Linn., we only secured a single 
female, also at flowers. Of the long-waisted grey wasp 
Belonogaster guerini, Sauss., var. dubius, Kohl, a single 
worker was taken at mud. We also took single examples 
of Salius [| = Hemipepsis] vindex, Smith, a male; the 
Scohad Myzine capitata, Smith, a male, and the small red 
wasp Odynerus carinulatus, Sauss., a female, the last-named 
at wet mud. The integuments of two males of Rhynchiwm 
rupeus, Sauss., proved of a truly rocky hardness. Running 
over damp mud three specimens of a notable ant were 
taken, Paltothyreus tarsatus, Fabr., notable for its powerful 
bite, but still more for its evil odour, which is very strong 
and pungent, suggesting a mixture of formic acid and 
