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Figures 140 and 141, d§ dorsal and ventral views Figures 142 and 143, Q, dorsal and ventral views

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L N 9 6‘ EQUATORIA PROVINCE RECORDS 1 Kapoeta Euxerus eI'*Lthropus leucoumbrinus Dec 8 Torit Euxerus erythro us leucoumbri nus Jan (2) 4 8 4 Torit Eerus erwt r0 us leucoumbri nus Feb 2 l Torit Euxerus ex" 50 us leucoum5r1' nus Mar 2 28 12 13 Torit Euxerus ervthro us leucoum5r1' nus Dec (4) l l Latome Euxerus eI"7tEo us leucofibri nus Apr (SVS) 1 1 Yei Euxerus erflhropus ?lacustr1's Apr

DISTRIBUTION IN THE SUDAN

Bahr El Ghazal: All from Galua.'L..Nyang Forest, from five spec.. imens of Egcerus e thro us subspp., in 1953, by H. Hoogstraal: 666‘, 19, I7 February; ’, 599, 4 nymphs, 19 February; 2643", 16 February.

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U er Nile: Bor, ex "Xerus rutilus", 268‘, 21 May 1909, H. H. King legit (S.O.C.). (This host name is a misidentification for

Euxerus ervthronus subspp. ) .

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Blue Nile: As 0 of H. calcarata; Roseires, from ground squirrel (Neumann 1910A) ;_also records two 68‘ that are probably H. he 1; Ch. Alluaud le it; cf. Hoogstraal (l955D). Kamisa, Dinder River, 10“, lg, . . Lowe leg it ['BM(NH)_7.

DISTRIBUTION

H. hou'i is a ground_squirre1 parasite extending in a belt across t e widest part of Africa from the Atlantic Ocean through French West Africa, Cameroons, the Sudan, and Uganda to the north. western corner of Kenya, west of the Rift Valle. It is closely related to H. calcarata that parasitizes a different genus of ground squi¥rels in East Africa east of the Rift Valley (Hoogstraal 19550). See also nosrs and BIOLOGY below.

WEST AFRICA: FRENCH WEST AFRICA (Rousselot l95l,l953B. Hoogstrael I955D. Villiers 1955).

CENTRAL AFRICA: FRENCH EQUATRIAL AFRICA (Bate, "New Cameroons") (Nuttall and Warburton 1915. Hoogstraal l955D).

EAST AFRICA: SUDAN (As 9 of H. calcarata: Neumann l9l0A. As §. 50211: Hoogstraal l954B,l955D).

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UGANDA and KENYA (Hoogstraal 195513).

HOSTS

Ground-squirrels, Eumerus e§ythroEu§ subspp. (All authors). King's specimen from "Xerus ruti us a Bor (SGC) is based on a ndsidentification of the Host. E. e hro s is the common groundsquirrel of West Africa, and of No cen r and East Africa west of the Rift Valley. East of the Rift Valley it is replaced by Xerus rutilus subspp., parasitized by H. ca.lcarata Neumann, 1902*. In Kenya, Ierus is confined to hot lowIand§_§5d_E§erus to higher, arable mountains from 2000 feet to 6000 feet elevation, but mostly above 3000 feet. If, as now seems apparent, it is true that these two ticks are so host specific, this would seem to be a bolstering argument against lumping these two squirrel genera in one genus, as some mammalogists advocate (Hoogstraal l955D).

BIOLOGY

Aside from the fact that all stages may be found on a single ground_squirrel, little is known concerning the biology of H. houyi. This tick and its host inhabit savannah country with few or scattered trees, and upland grasslands. Along the southern border of the squirrel's range it extends into forested districts, but only in tongues of grassland with scattered trees between thicker forest. As already stated under HOSTS, in Kenya, where the two host genera and the two related tick species occur near each other, the host of g. houyi is confined mostly to arable up. lands and that of Q. calcara a inhabits warmer and more arid low. lands.

*The record of H. calcarata from Dahomey (Villiers 1955) undoubtedly is based on misidentification.

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In the Galual.Nyang forest area of Bahr E1 Ghazal, each of five host specimens examined was infested. In Torit District of Equatoria, a third of the 27 hosts examined yielded specimens of

g. hegi.

DISEASE RELATIONS

Unstudied but potentially important.

IDENTIFICATION

The following characters easily distinguish males among the Sudan haemaphysalid fauna: strong ventral spur on trochanter I; all coxae with distinct spurs; tarsi short, robust, and abruptly tapered; palpi widely expanded basally, without a developed dorsal spur basally, with basal spur ventrally and spu from segment 3 ventrally; basis capituli strongly diverging anteriorly and with oderate cornua; dentition 4/4; scutum with long, deep lateral grooves enclosing first festoon, and few, scattered, shallow, inconspicuous punctations of mixed sizes; size ranges from an overall length of 1.71 m. to 2.15 m. and width of 0.99 m. to 1.20 mm.

Females are also easily recognized by the raised spurlike, non.projecting ventral ridge of trochanter I, coxae and tarsi almost exactly like those of male; palpi essentially like those of male but larger and more elongate, basis capituli short, wide, and with prominent cornua and anteriorly diverging lateral mar. gins; dentition 4/4; scutum only very slightly longer than wide and broadly rounded posteriorly, with few, shallow, scattered punctations of various sizes mostly on anterior half. The size is somewhat greater than that of males.

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Figures 11.1. and 11.5, <9, from domestic dog (Kajo Kaji) Figures 146 and 147, Q, from domestic dog (Kajo Kaji) Figures 148 and 149, 0" and 9, from civet (Obbo)

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