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The middle festoon of a few males may be largely pale and other festoons may be equally so; such specimens would key to A. hebraemn. There are no excessively pale festooned individualsIn our own collection or in that of British Museum (Natural History), but some material in the Onderstepoort collections shows this variation (Theiler, correspondence). Such a specimen, seen in the Rocky Mountain Laboratory collection, was the cause of misidentification of A. cohaerens as A. hebraeum in Schoenaers' (l95lB) list. A. hebraeum, though_coIorfT.I, never shows as much iridescence as most otEr ticks of this genus (Theiler, correspondence).

Should specimens resembling A. cohaerens be found on the west bank in Equatoria Province, they sm~ecmd against A. s lendidum Giebel, 1877, of the Congo and west Africa (of. ‘Robin. son I%3, pp. 123-125). A. s lendidum males are somewhat larger, have a spot in the center of the scutum, and never have a falciform stripe. Females are indistinguishable from those of A. cohaerens although they are often a little larger.


A. cohaerens also closely resembles A. astrion of West Africa.

Sousa-'Dias (IQU) confused A. astrion with A. cohaerens. Recent studies by Theiler indicate the distinctness of the two species. Since A. astrion is unlikely to be found in the Sudan tick fauna, it is Tmnecessary to mention further detail. However, students who may compare our nomenclature with that of Sousa Dias should

be aware that this discrepancy exists.



A. cohaerens is easily recognized within the known Sudan tick fauna. Closely related species, some of which may occur in the Sudan, are mentioned above.

Males faJ.l into a group in which the eye is not in a de.. pression, although it may be very slightly convex; festoons are mixed dark and pale, scutal punctations are only fine, scutal ornamentation is as illustrated (Figure 64) but either with or without a falciform stripe; lateral grooves reach nearly to the eyes. This is a medium size tick, from 5.0 mm. to 6.0 mm. long

and from 4.0 mm. to 4.7 mm. wide.

Females have a triangular scutum with only fine punctations and with an extensive pale central area; the lateral scutal areas are dark except for one or two very small light marginal spots. The eyes are not in a depression though they my be very slightly convex. leg segments are ringed by broad bands. Females are of medium size, approximately 5.0 mm. long and 4.0 mm. wide. The scutum is approximately 2.8 mm. long a.nd 2.9 mm. wide.


Figures 68 and 69, 6", dorsal and ventral views F

igures 70 and 71, Q, dorsal and ventral views

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A. lepidum occurs in all Provinces except Northern, though it does arrive at the Wadi Halfa quarantine in Northern Province on cattle from the South (King l926).

All available Equatoria Province specimens originate from Eastern District and Torit District with the single exception of a male from a tiang at Terakeka (H. H. King legit), on the west bank of the Nile.

The following Sudan locality records are il__l from cattle a.nd _;al_l from _t§ Sudan Government collection unless otherwise noted?


Bahr el Ghazal: Lau and Yirol (svs), Guar, Gogrial Sub. aistr“‘£"ie (E{reTi"T"e; svs), Aliab (buffalo; svs). Akot (dying bull; svs). Eight miles west of Yirol (head of greater bustard; svs).

I doubt that 5. lepidum is widely established, if at all, in Bahr el Ghazal Province. ach collection consists of only a single male, except for one male and female from great herds of migrating cattle at Yirol, 22 April 1954 (svs).

U r Nile: Pibor Post. Akobo. Maban (domstic cattle and geats"E§§, Ti ariak (svs). Bor (svs). Melut (nnile). Rom (buffalo). Kaka (roan antelope). Er Renk (domestic sheep). Makier (svs). Malakal (HH). Specimens from Tonga, that were identified as A. le idum by Ubnitz in 1912, were the basis of King's (1911) reporg of A. hebraeum..varie atum from the Sudan according to Nuttall's notes for Et 529 in Es logbook in British Museum (Natural History).

Blue Nile: Hosh. Tibna. Roseires. Wad el Nail. Singa (camel). WE_Medani (domestic cattle, miles, and camel; SGC, HH. One c? feeding between toes of man, August 1951.; Eisa El Minesi le 't). Abu Hashim (camel). Sennar (camel). Lake Ras Amer (camel). Abu Zor. Hassa Heissa (camel; G. B. Thompson, correspondence). Sennar area (cheetah; Robinson 1926). Kosti (Gordon College collection).

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