102 Dr. C. P. Alexander on African Crane-flies 
long, less elongate than in N, albonigra; first scapal seg- 
ment obscure orange; second segment light brown; 
Hagellum black, the basal enlargement about one-half the 
remainder of the segment. Head fiery orange ; a brown 
spot on the vertex adjoining the inner margin of the eye; 
occipital mark rather small, dark brown. 
Prothorax shiny black, indistinctly paler medially. Meso- 
notal prescutum with the black stripes entirely confluent, 
except in the female where the interspaces are barely 
indicated behind ; humeral angles light yellow, concolorous 
with the dorso-pleural membrane ; scufum and scutellum 
shiny black, the median line of the former and the extreme 
base of the latter obscure yellow ; median sclerite of post- 
notum with the cephalic half light yellow, the caudal half 
black, the postnotum and scutellum densely and con- 
spicuously clothed with short, dark-coloured hairs ; lateral 
sclerites of postnotum black with a large yellow area in front 
of the halteres, this also including the mesepimera of the 
pleura. Pleura black, the dorso-pleural membrane and a 
large area in front of the halteres as discussed above, light 
yellow; the margin of the mesosternum between the mid- 
and hind coxe likewise light yellow ; margin of the meso- 
sternum between the fore and mid coxe more obscure 
yellow. Halteres black, the knobs conspicuously light 
yellow. Legs with the coxz black, sparsely pruinose; tro- 
chanters brown, the fore trochanters more reddish brown ; 
femora black, the bases narrowly and indistiictly paler ; 
tibi rather light brown, the tips blackened ; tarsi black. 
Wings with a strong yellowish-brown tinge, the costal cell 
slightly darker, cell Sc dark brown; wing-tip very indis- 
tinctly darker ; veins dark brownish black ; macrotrichiv 
in the apex of cell /?; reduced to but one or two, or lacking ; 
stigma more densely hairy than in N. a/bonigra, there being 
from twenty to twenty-five macrotrichiz proximad of 7 ; 
Venation: Rs short, but little longer than the deflection of 
R,,5; cell M, broadly sessile ; fusion of M; and Cu, slight, 
about equal to M beyond it. 
Abdomen shiny blue-black, the candal margins of the 
segments narrowly but conspicuously velvety black ; tergites 
one to four with a conspicuous reddish area on the sides 
near the base ; hypopygium dark, the outer pleural append- 
age light yellow. In the female, seguents eight and nine 
are rich reddish orange, the valves similar but more blackish 
basally. Male hypopygium with the ninth tergite extensive, 
the caudal margin with a conspicuous V-shaped depression, 
