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Females have anal grooves similar to those of males. The scutum is very slightly longer than wide; has a slightly sinuous posterior margin; dark brown color; long but shallow cervical

grooves; no lateral grooves; and numerous, fine puctations.

The basis capituli has distinct cornua dorsally and no auriculae (lateral spurs) ventrally, in place of the latter is a rounded or acutely angled bulge. Coxae I and IV have a faint tubercle, that of I situated at the posteromedian point, of IV externally

near the posterior margin.

Fuller descriptions of both sexes are presented by Arthur (ms.). The immature stages are unknown.

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Figures 220 and 221, Q, engorged, dorsal and ventral views

IXODES NAIROBIENSIS

Specimen from Er Renk, Upper Nile Province, Sudan (sec), in poor condition.

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L N 9 6 EQUATORIA PROVINCE REIIORDS 7 Torit Masto s natalensis ismailiae Dec 1 Lotti Forest Eastogs natalensis Ismal'IIae Mar

The Lotti Forest specimen was taken at 4500 feet elevation.

DISTRIBUTION IN THE SUDAN

U r Nile: Er Renk, a single female from a dog, H. H. King

le it, King (1926) had referred to this specimen as ‘Ixodes rasus". See C71‘I£E.'R SUDAN NOTES under Ixodes rasus ?suh. species.

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DISTRIBUTION

Ixodes nairobiensis is a seldom collected tick of East Africa that ranges as far south as Southern Rhodesia and Angola.

msr AFRICA: sumn (Hoogstraal 195./.12).

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mm (Nuttall 1916. Bedford 193212). ucmm. (Theiler, un. published).

SOUTHERN AFRICA: ANGOLA (CNHM collection, from near Dundo, Lmfla~%H (Theiler, unpublished).

HOSTS

The strange assortment of hosts listed below indicates that there is much to learn about this tick and that some records may be due to misidentification.

Females

Domestic dogs (Nuttall 1916. Sudan record above). Warthog

and multimannmte mouse (Masto s) (Bedford 19328). Shrew, civet, am the following rodents: ra (Rattus rattus); creek rat ,

Pelo s fallax concolor; rock rats, Ketho s spp.; and groovetoot% §‘E',_OtoEs tro icalis Eetoriae iTHeiler, unpublished), and striped grassmouse, GXIIILISCOES s. striatus (Angola. specimen mentioned above).

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Nymphs from multizmzmnate mice (Equatoria Province records above), and Aethogs spp. (Theiler, unpublished). Larvae from

Otogs tropic s Eetoriae (Theiler, unpublished). Unstated

s age mm or grass rat , Arvicanthis abyssinicus (Theiler, unpublished).

BIOLOGY

The male is unknown. It either takes no blood or feeds for only short periods, and should be searched for especially in rodent nests. Innnature stages have been collected from nest. inhabiting rodents and proba.bly also feed on insectivores as well. Females parasitize carnivores and the warthog. It is

noteworthy that Roberts (1935) did not obtain this tick in his survey of rodent..nest inhabiting ticks in the Nairobi area. See HOSTS above.

DISEASE RELATIONS
Unstudied .

IDENTIFICATION

The female is readily identified. The anal grooves are horseshoe shaped. The scutum is 1.5 times as long as wide or even longer, widest Just anterior of the midlength; it has a moderate number of mostly fine and a few moderate size puncta

tions many of which give rise to a pale hair, distinct lateral ridges, and a depressed cervical area; its color is chestnut brown. Coxae are without internal spurs except on I, but each has a small basoexternal spur. The auriculae (i.e. lateral spurs) of the ventral basis capituli are long and retrograde.

The immatue stages have not yet been described and the male is u5E§5w5:_

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