MALLOPHAGA FROM AFRICAN HOSTS. 151 



Male. — Length, Tl mm. ; width, '64 mm. ; abdomen, length, "6 mm., width, 

 •64 mm., appearing almost circular ; last segment with arrangement of hairs and 

 genitalia shown in fig. 1« ; genitalia not strongly chitinized. 



Menopon nigrum, sp. n. (PL V, figs. 4, 4a, ih). 



Four specimens, two male and two female, of this strongly marked species, 

 from a white-necked raven (Corvulfur 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. piece, Denny. It differs, 

 however, from the former in its abdominal markings, pustulated abdominal 

 hairs, form of head, &c., and from the latter in the ai-rangement 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 antennae. Eye 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 beliind, 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 

 tibire. Abdomen elliptical ; posterior mai'gin 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 segment occurs a structure 

 found in other members of this crow-infesting group, namely, two groujjs of short, 

 stout spines as shown in fig. 46. 



Male. — Length, 1*76 mm. ; width, "62 mm. ; the genitalia are strongly 

 chitinized (fig. 4ff) ; 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 (Plecfroptenis gamhensis), Khor Felos, Egyptian Sudan {IL H. King). 

 20419 B ? 



