MALLOPHAGA FROM AFRICAN HOSTS. 151 
Mavr.—Leneth, 1:1 mm.; width, 64 mm.; abdomen, length, *6 mm., width, 
64 mm., appearing almost circular ; last seement with arrangement of hairs and 
genitalia shown in fig. la ; genitalia not strongly chitinized. 
Menopon nigrum, sp. n. (Pl. V, figs. 4, 4a, 40). 
Four specimens, two male and two female, of this strongly marked species, 
from a white-necked raven (Corvultur albicollis), Oshogbo, Southern Nigeria 
(J. J. Simpson). This form is closely related to others of the genus found on 
crows, especially to M. mesoleucum, Nitzsch, and to M. pice, Denny. It differs, 
however, from the former in its abdominal markings, pustulated abdominal 
hairs, form of head, &c., and from the latter in the arrangement of its hairs and 
in other details. 
FEMALE (PI. V, fig. 4).—Length, 1:92 mm.; width, *76 mm. Head: length, 
-46 mm. ; width, ‘64 mm. ; front rounded, with rounded angles on the sides ; ten 
hairs on each side, some of which are minute, and one very long one arising 
on the margin at the angle near the base of the antenne. Hye prominent, 
emarginate, with a distinct black fleck. Antennal band broad, pitchy, extending 
to meet the lighter coloured occipital bands which are united at their anterior 
ends, and also extending forward and ending in a pitchy blotch on the margin. 
Temples broad, squarish, with a pitchy marginal band extending around the 
concave occiput ; four very long hairs on the temples arising from large clear 
pustules ; also several shorter hairs. Thorax: length, 46 mm.; width, 64 mm. 
Prothorax lenticular, rounded behind, with no marginal bands; series of hairs 
across posterior margin. Mesothorax distinct, with pitchy marginal band ex- 
tending around to anterior margin. Metathorax also with pitchy marginal 
bands ; posterior margin convex, rounded ; sides of meso- and meta-thorax 
diverging. Legs with broad femora, with pitchy marginal bands on femora and 
tibie. Abdomen elliptical; posterior margin of first segment convex, much 
enlarging that segment as is often the case in species of this group of the genus. 
Ground-colour rather dark, with a narrow pitchy lateral band and a dark chestnut 
transverse blotch extending across each segment. A. series of hairs across each 
segment, arising from small clear pustules; very long hairs arising from the 
angles of the segments. On the under side of the first seement occurs a structure 
found in other members of this crow-infesting group, namely, two groups of short, 
stout spines as shown in fig. 4, 
Mate.—Length, 1°76 mm.; width, 62 mm.; the genitalia are strongly 
chitinized (fig. 4a); there is no fringe of hairs on the last segment, which is 
chitinized on its posterior margin, 
Trinoton luridum, Nitzsch. 
Two specimens of this common parasite of ducks and geese from the spurwing 
goose (Plectropterus gambensis), Khor Felos, Egyptian Sudan (71. H. King). 
20419 E 2 
