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Figures 236 and 237, o, dorsal and ventral views Figures 238 and 239, o, dorsal and ventral views

MARGAROPUS REIDI SP. NOV. Holotype and Allotype

PLATE LXVIII

- 576

MARGAROPUS REIDI SP. NOV.

(Figures 236 to 239, and 342 to 358)

THE SUDANESE BEADY-LEGGED TICK

DISTRIBUTION IN THE SUDAN

Bahr El Ghazal: All from Giraffa camelopardalis subsp., E. T. M. Reid legit: Liednhom (south bank of Jur River); 1400, 1999, from muzzle, March 1955. One nymph, same locality, 8 March 1955. Twenty-four nymphs, Guar, Galual Nyang Forest, 15 May 1953.

DISTRIBUTION

M. reidi sp. nov. is known only by the above specimens from the Sudan. It is related to the South African winter horse tick, M. winthemi, the range of which is charted by Theiler and Salisbury (1956). The small males may easily, have been overlooked by earlier collectors and the larger females may previously have been quickly identified as Boophilus by nonspecialists. More careful search should reveal the wider distribution of this interesting tick in the Sudan and possibly elsewhere in Africa. See M. winthemi (page 900).

HOSTS

The only known hosts are three specimens of the western Su danese form of giraffe, Giraffa camelopardalis subsp., the actual subspecific identity of which is considered by Setzer (1956) to be a moot subject that cannot presently be decided. winthemi (page 900).

See M.

BIOLOGY

Unstudied. See M. winthemi (page 900).

Unstudied.

DISEASE RELATIONS

REMARKS

M. winthemi and M. reidi sp. nov. are readily distinguished by key characters (pages 574 and 575).

The HOLOTYPE ♂ is deposited in the United States National Museum, number 2225. The ALLOTYPE is deposited in the same institution, together with one of the PARATYPE nymphs collected on 15 May 1953. The data for these specimens are presented a bove. A single d, g, and nymph (15 May 1953) PARATYPE are depos ited in the Onderstepoort collection (Dr. G. Theiler), East African Veterinary Research Organization (Miss J. B. Walker), British Mu seum (Natural History), Rocky Mountain Laboratory, and Chicago Natural History Museum. The remainder of the PARATYPE material is in the writer's collection.

See M. winthemi (pages 899 to 905).

DESCRIPTION

MALE (Figures 236, 237, 342 to 346): Length overall approx imately 3.0 mm., width approximately 1.4 mm. Color (dry) dark reddish brown, legs yellowish; integument white, yellowish, or dark brown. Outline oval with integument bulging beyond scutum laterally and posteriorly, but lacking caudal protrusion (avail able specimens are moderately engorged).

Capitulum: Basis capituli twice as wide as long; lateral margins markedly diverging anteriorly, basal margin slightly concave; dorsal surface bearing a horizontal row of twenty hairs at level of midlength; ventrally more elongate, length and width equal, lateral margins slightly concave, basal margin convex. Palpi comparatively short; overall length and width of each palpus approximately equal; segment 1 forming a short, wide pedicle for segment 2. Segment 2 subquadrate, approximately twice as wide as long; outer margin slightly expanded basally, inner margin

straight or slightly convex; anterior and posterior margins straight, parallel. Segment 3 triangular, outer margin approximately twice as long as inner margin. Palpi ventrally with segments 2 and 3 of almost equal length, segment 3 bearing a small triangular retrograde spur extending just beyond the apex of segment 2; segment 4 small, inserted in pit of segment 3; segment 1 forming a slight pedicle for palpi and bearing at its inner basal margin a slight knob with at least one bristle. Hypostome twice as long as wide, apical margin broadly rounded and notched medially; a dense corona present; dentition 5/5, with nine to eleven denticles in each file, files of equal length.

Scutum: Outline narrowly elongate with lateral margins parallel, posterior margin bluntly rounded; lateral margins widening slightly over scapulae; anterior emargination deep. Posteromedian and paramedian grooves shallow, narrow, short, and indistinct, situated at level of spiracular plates. Cervical grooves shallow but distinctly divergent to lateral margin posterior of eyes. Eyes on lateral margin at level of coxa 2; small but distinct, rounded and slightly raised. Surface of scutum smooth and shiny, with a narrow median field of few scattered punctations extending the full length of the scutum; a single row of twelve hairs along posterior margin and a few hairs among posterior grooves; area between cervical grooves and lateral margins punctate and bearing scattered fine, long, white hairs; a row of hairs also situated on anterior margin between cervical grooves. Integument bulging around scutum from level of eyes posteriorly; furnished with regularly scattered, dense, long, white, conspicuous hairs bordering scutum to level of spiracular plates; thence these hairs more confined to narrow lateral surface of integument around posterior margin of scutum, few or no hairs on dorsal surface in this area.

Spiracular plate subcircular, with one and a half rows of large goblets surrounding aperture. Genital aperture situated at midlevel of coxa II, anterior and posterior margins parallel, lateral margins slightly converging posteriorly. Genital grooves extending from genital aperture to level of anus, slightly diver gent. Adanal shields commencing at anterior level of coxa IV and extending beyond level of anus almost to posterior margin of body (depending on degree of integumental stretching due to feeding), narrowly elongate, slightly expanded just anterior of anus,

tapering and bluntly rounded distally; divided from each other by narrow area of integument; unattached to integument posterior of anus; surface bearing a few scattered hairs distally. Accessory shields extending from level of anus to approximately same level as apex of adanal shields, tapering, bluntly rounded apically; narrower than adanal shields. Hairs on ventral surface fairly dense and evenly distributed but shorter than those on lateral surfaces.

Legs with free segments appearing beaded due to width and constriction between several segments; length-width ratio of segments variable but width of none equalling length of same segment; free segments with numerous long, fine hairs dorsally and ventral ly. Tarsi apically extended into a downward projecting, spurlike point; IV also with a short ventral subapical spur; outline narrowly elongate; claws and pads arising from dorsal surface at apex; claws long, narrow, recurved at some distance beyond pads. Coxa I narrowly, elongately subtriangular and extending anterior_ ly almost to anterior margin of basis capituli, visible from dorsal view; posteriorly deeply cleft to form a widely triangular outer spur and a narrower, tapered inner spur; other coxae sub rectangular with rounded margins; posterior margins slightly cleft; all coxae with numerous hairs.

FEMALE (Figures 238, 239, 347 to 351): Unengorged specimens are very slightly larger than males; engorged specimens measure up to 6.2 mm. long but retain the linear, podshape appearance of boophilid females due to the severely parallel lateral margins of the body. Female characters recall those of the male but the leg segments are less expanded and the palpi are more elongate with a slight constriction between the second and third segments.

Capitulum: Basis capituli from one and a half to twice as wide as long; basal margin moderately concave and joined to lateral margins by slight expansions suggestive of cornua; lateral margins concave to widest point at anterior third, thence recurved to anterior margin; porose areas small, shallow, and indistinct, subtriangular or pear shaped; bearing four or five hairs laterally on dorsal surface. Palpi more elongate than those of male, segments 2 and 3 separated by a pediclelike constriction and of

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