1925 ] New N emestrinidce from Rhodesia and New Guinea 
15 
similar to S. wiedemanni Lichtwardt, that only the differences 
are noted: .“Smaller and more elegant in the whole build of the 
body; the color is markedly paler than in S. wiedemanni and 
has a more greyish tinge; while the uniformly colored surface of 
the wing is also more smoky grey, showing but a narrow, yel- 
lowish-brown stripe along the anterior margin. Sharp dif- 
ferences are the absence of the “bulla’’ in the wing of both sexes; 
the inequality in size of the ocelli, of which the anterior one is 
twice as large as one of those placed at the occiput; and the 
bud-like, rounded shape of the male hypopygium, which is larger 
in proportion to the size of the animal. Length of the body, 
13 mm.; of the proboscis, 10 mm.; of the wing, 15 mm.” This 
description was drawn on a male and female from Mazoe, Mash- 
onaland (Southern Rhodesia), in the British Museum. Later,, 
Lichtwardt recorded as S. gracile two females from Barberton,, 
Transvaal, in the South African Museum (Entom. Mitteil. 
Berlin, IX, 1920, p. 97). Bezzi (Ann. South African Mus., 
XIX, 1924, p. 171) does not appear to have seen it. 
'I have referred to S. gracile one female and two males of 
Cloudlands, 6,000 ft., Vumbu Mts., Southern Rhodesia, 6 to 
17 April, 1923 (without collector). It must be stated, however, 
that the description quoted above does not allow a positive 
identification, so that I feel justified in giving some additional 
data that might help in separating S. difficile from what I take 
to be S. gracile. 
The measurements of the three specimens before me are 
as follows: 
Female. Length not including ovipositor (to apex of tergite 
4), 11.5 mm.; greatest width of abdomen, 5.7 mm.; length of 
proboscis, 10.5 mm.; length of wing, 14 mm.; width of wing, 
4 mm. 
Males. Total length, 11 and 11 mm.; greatest width of 
abdomen, 5.5 and 5 mm.; length of proboscis, 11 and 10 mm. 
length of wing, 13 and 12.5 mm.; width of wing, 4.2 and 4 mm. 
In these examples the proboscis may therefore be said to be 
about as long as the body. Quite apart from individual variation, 
a certain latitude should be allowed in judging these relative 
lengths, as the body length certainly changes after death, while 
