1925] New Nemestrinidce from, Rhodesia and New Guinea 
11 
the posterior margin much constricted in its basal quarter, 
where a very narrow trace of the alula extends from the axillary 
excision to the base of the wing. Wings very faintly infuscate 
all over; more distinctly yellowish grey in the costal cell and 
at the extreme base. Veins dark clove-brown; epaulet and 
basicosta nearly black; the epaulet mostly covered with black 
pile. Venation of the usual type of the genus; fourth posterior 
cell with a long petiole at base; sixth longitudinal vein faintly 
undulate (more so than in S. gracile Lichtwardt); no “bulla” 
at base of second vein; axillary vein not developed beyond 
axillary incision. 
Length not including ovipositor (to apex of tergite 4), 10.5 
mm.; greatest width of abdomen, 4.5 mm.; length of proboscis, 
14.5 mm.; length of wing, 14 mm.; width of wing, 3.4 mm. In 
the paratype these measurements are respectively 11 mm.; 5 
mm.; 16mm.; 15.5mm.; 4mm. 
This species is allied to Stenobasipteron gracile Lichtwardt, 
also of Southern Rhodesia. From published accounts alone, 
it would have been difficult to point out the differences. For- 
tunately, I was able to compare specimens of the two species. 
The proboscis is decidedly longer in S. arnoldi , being always 
much over body length; the wings are narrower (in a female of 
S. gracile they measure 14 by 4 mm.) and much less infuscated; 
the third segment of the antennae is decidedly shorter (in S. 
gracile it is about twice as long as wide at base and amply as 
long as the two basal segments together). 
Stenobasipteron difficile sp. nov. 
Type female from Cloudlands, 6,000 ft., Vumbu Mts., 
Southern Rhodesia, 6 to 17 April, 1923 (without collector). In 
the collection of the Rhodesia Museum. 
A medium-sized, rather thickset, black species, covered 
with cinereous tomentum on the under side, with a black bloom 
on the upper side, the dorsal surface of the abdomen somewhat 
shiny. Antennae and legs reddish brown; the last antennal 
segment and the hind tarsi darker. Pilosity moderately long 
and dense on head, thorax and base of abdomen, yellowish white 
