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Scutum with some large punctations

scattered over entire surface;

length usually equalling or greater

than width*. Eyes £18-toeacoeceoeooeeooeeoeeceeoeo.eeeooeeee6

Scutum with few large punctations

only on anterior half; wider than

long, nnstly pale (reddish brown).

Eyes slightly convex. (Very large

tick, chiefly from rhinoceros)...............A. RHINOCEROTIS Figures 35 £53 37

Scutum with extensive pale median

area that is broadly rounded poste.

riorly. (Large tick, chiefly from

Figures 7K 553 75

Scutum with less extensive pale median

area that narrows to a point poste.

riorly. (Medium size tick, chiefly

from tortoise and leguan lizards)................1_\. NUTTALLI Figures 73 E53 7§

Scutum dark centrally, small pale spot

on posterior border, lateral fields

with small pale spots or entirely

dark. Eyes flat. Very narrow pale

rings on legs. (Chiefly from elephant)..........A. THOLLONI Figures 96-1»-TFE

Scutum pale centrally, lateral fields

with only small pale spots. Eyes

slightly convex. Broad pale rings

eh legs. (Chiefly from buffalo)................_A. COHAERENS Figures 6613'?


*In the Sudan, exceptional specimens of A. marmoreum may have a scutal width of at least 1.3 greater thah length (Figure 74), but in these, large punctations are scattered over the entire scutal surface.

right scutal margin lateralfestoons on right side absent, only three legs

H m We a n W. V n I n M. Au _m, e n e. W

- 210

Q, dorsal and ventral views, Uganda specimen AMBLYOMMA.6OHAERENS Q illustrated is malformed in the following areas: left scutal margin anteriorly and ly deformed, Diagnostic criteria are not affected by these

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Figures 66 and 67,
Note: The

on left side.

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34 Boma Plains S erus caffer a uinoctialis Dec *1 Obbo Crammo s macm1'lIani ~§ Me


Birds *1 Obbo Turdus libon@us centralis Mar *1 Torit Francolinus clappgrtoni ggdgii Dec *1 Ikoto Humida meIe§g£1s maqor Dec


The Boma Plains specimens constitute the first and only definite record of A. cohaerens from the Sudan. If the tentative immature stage ifintifications are correct, we may expect that A. cohaerens occurs in other parts of Equatoria Province, especially where Efalos roam. The East African buffalo tick has not been found in Bahr El Ghazal or in Upper Nile Provinces, although buffalos are present in these Provinces and frequently have been examined for ticks by H. H. King, Sudan Veterinary Service personnel, and the writer.

A. cohaerens is an East and Central African buffalo parasite

that-reaches the northern limit of its range in Equatoria Prov. ince and extends southwards into Tanganyika.

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CENTRAL AFRICA: ['?CAMEROONS: Noted by Schulze (1941) with. out data. Recorded on (?imported) cattle at Yaounde by Rousselot (1951) but not repeated by him (195313). Rageau (l95l,l953A,B), apparently quoting Rousse1ot._7 FRENCH EQUATORIAL AFRICA (Rousse.

lot 195l,1953B) .

BELGIAN CONGO and RUANA.URUNDI (Nuttall and Warbuton 1916. Robinson 1926. Schwets l927B,C,l932. Bequaert l93OA,B,l93l. Rousselot l95l,1953B. As A. cohaerens and also as A. hebraeum: Schoenaers l95lA,B; see REMARKS EIow. Theiler and"Ro5inson 1954.

Van Vaerenbergh 1954).
EAST AFRICA: "msr AFRICA" (n'dnitz 1909).
SUDAN (Hoogstraal 195413).
FRENCH sa~uL11.A1~m (Hoogstraal 195313).

mm (Robinson 1926. Lewis 1934. Weber 1948). momma (Neave 1912. Robinson 1926. Tone1li.Rondelli 1930A. Richardson

1930. Mettam 1932. Mettam and Carmichael 1936. Wilson 1948A, 1950c. Hoogstraal 19540). TANGANYIKA (As 5. ancep = nbnitn 1909. Hoogstraal. 1954c).

NOTE: The moon record by Sousa Dias (1950) is actually A. as rion, not A. cohaerens (Theiler, correspondence). See

~1w. _7'


All authors list the African buffalo Syncerus caffer as the chief host of cohaerens. , ,


The East African buffalo tick is frequently reported to attack domestic cattle in areas where buffaloes are commnon or after large numbers of these animals have been shot out for disease control. Domestic cattle have been listed as hosts by Robinson (1926), Schwetz (1932), Schoenaers (l951B), and Rousselot (l95l,1953B). Cattle are frequently parasitized when near game, especially buffalo (Wilson l948A,l95CIl). In

certain Uganda areas, A. cohaerens, together with A. va.rie atum, is the predominant cattle tick on old buffalo grazing grofifis (Richardson 1930). It would be interesting to know how long the buffalo tick remains in an area as a cattle parasite after its chief host has been exterminated.

Other animals are rare hosts of adults. Elephants (Robinson 1926). Tortoise, and domestic sheep and oats (Mettam 1932). Bland (Lewis 1934, weber 1948). Warthog Theiler, unpublished). Black rhinoceros (Hoogstraal 19540. Also 2&3‘ removed from a Tanganyika rhinoceros skin by a taxidermist - CNBM collections).

Hosts of nymphs (tentatively identified as this species)

are ground birds a.nd a tree rat (Equatoria Province records above). Dozens of Thammo s tree rats have been examined by me in the Sudan and Kenya witfiut finding other ticks on them. Several nymphs have been taken from a warthog near Lake Edward, Uganda, by Lt. Col. Don Davis, U.S.A. (HH collection).


Unstudied. In Ruanda-Urundi, A. cohaerens occurs as high as 2200 meters altitude (Schoenaers 1951B, as _I. hebraeum).


Unstlfiied .


Sections of the mouthparts of A. cohaerens have been illustrated by Schulze (l936a), who also-i]I_tt_dus ra e the form of haller's organ (1941), and (l950A) discussed the dentition of this species. Schulze also (1933!) utilized this tick to illustrate his concept of the relation of ornamntal design to location of muscle attachments. A mnnber of other remarks and illustrations concerning the exoskeleton of this species are presented in the same study.

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