Page images
PDF
EPUB

HARES were seldom collected. Seven adult R. £ sanguineus specimens from one host are represented.

GROUND SQUIRRELS, Euxerus # subsp., are common in the Forest. Five squirrels obtained in February yielded twelve males, six females, and four nymphs of H. houyi.

Small MURID RODENTS have not been collected and searched in this Province. Twelve male and six female H. leachii muhsami were found on a small rodent burrowing in a termite mound.

CANE RATS (THRYONOMYIDAE) are not known to be infested by R. Simpsoni in this Province but an unusual record of two male R. s. simus from a cane rat at Yirol was obtained by Mr. Reid, who also found a nymph of A. variegatum on a cane rat 37 miles west of Yirol.

CARNIVCRES have received considerably less attention than antelopes, buffalos, giraffes, and warthogs in this Province. A black-legged mongoose in the Forest (May) was infested by sixteen adult H. leachii muhsami, another at Yirol (January) by only a single male of this species. A leopard 36 miles south of Yirol bore two males of the same tick as well as a male and three females of R. sulcatus. Another mongoose in the Forest was infested by adults of R. s. simus, a tick also represented by a single male from a hyena, seven adults from a leopard, and a male from a lion. A hyena at Yirol yielded a male H. l. leachii and seven adult R. s. simus. It is of some interest that no specimens of R. s. singiineus were recovered from carnivores.

ELEPHANTS in this Province appear to be outside the geographic range of their usual parasites, A. tholloni and D. c. Circ ttatus. Small to moderately large numbers of R. s. # *Šimus senegalensis infested every elephant examined in the southeastern spur of this Province (including Kenisa on the Upper Nile Province border). In the case of R. S. simus, both sexes were taken on elephants during each season of the year. Mr. Chorley, who shot several elephants in the western part of the Province, stated that no ticks infested these animals.

No specimens of RHINOCEROS were examined but seven male and six female D. rhinocerinus on grass from two localities near Yirol suggest this tick's infestation of those animals that do occur.

WARTHOGS were common in the Forest. Ticks from six hosts were:

[merged small][merged small][graphic][subsumed][subsumed]

Discovery of the eyeless tampan, Q. moubata in three warthog burrows in the Forest area is of extreme interest (pages 121,129,

144,149) o

A HIPPOPOTAMUS shot in the Jur River, in the northeastern corner of the Province, in April had nine male and one female R. s. simus on its ears.

Apr
Jun

Sep

[ocr errors]
[ocr errors]
[ocr errors]

GIRAFFES in northeastern Bahr El Ghazal comprise one of the most northern populations of these animals in eastern Africa. The first four hosts on the table (page 813) were taken at Liednhom on the south bank of the Jur River, near the Galual-Nyang Forest where the remainder of the hosts were secured. Data for the number of giraffes examined but free of ticks were not obtained. The chief tick species infesting thirty hosts are listed in the table

on page 813.

There were no significant differences between infestations of male and female hosts. The only ticks in addition to those listed in the table were a male R. s. simus (Host 3), two male A. lepidum (Hosts 8 and 17), and a male R. tricuspis (Host 30). "

Inasmuch as cattle passing the boundaries of this area are heavily infested by A. variegatum, the absence of this tick on

seventeen of these giraffes and the light to moderate infestations on the remainder of these animals is noteworthy. These data con

tribute to other from this area indicating that the bulk of the A. variegatum population does not commence reproduction until well T

into # rainy season (June, July).

The presence of two male A. lepidum on these giraffes is of some interest inasmuch as ecological conditions in Bahr El Ghazal seldom meet this tick's requirements. A. lepidum populations in this Province are either small, rare, and restricted, or else introduced but not thriving. From the fact that only a single male R. s. simus and no R. e. evertsi were taken it would appear that giraffes are not favored hosts of these ticks, which are common on other animals in the area.

The frequency with which both sexes of H. rufipes and of H. truncatum were found on the same hosts from March # June indicates breeding of these species late in the dry season and through the first half of the rains. Data for other seasons are not available. The small amount of data for both sexes of H. truncatum feeding in August may indicate that adults continue to appear and mate throughout the rainy season or else that a second generation has reached adulthood later in the rains.

M. reidi sp. nov. is known only from these collections. Whether it is a typical parasite of giraffes remains to be determined. The small amount of available data suggest that the reproductive season commences early in the rains.

[ocr errors]

*4sou emqeumIII:

92 OT /T 2 99 09T 29, L8 2T 09 TV.I.O.L.

2 Z 6 2ny Og

9 9. 3ny 62

9 7 3nv 82

9 9T 3ny L2

T T Tnp 92

T 2 TnT. 92

2 Tnr 72

T T TnT. 9.2

9 9. Unf ZZ

9. T unf Tz

6 % Umf OZ

2 % ARW 6I

2 ARW 8Ts

8 T 9. % Aew LT

2 APW 9T

9. T Aew GT

9. Z ARW /T

g TI 2 9. T Aew 9T

2 4. T Aew ZT

% TT T 6 Aew TI

9. % % T 2 Aew OT

%I 8T T Aew 6

9 8 Aew 8

ABW L

#2 9T adv 9

7 72 JCRW 9

z 9 JeW 7

[ocr errors]

Nineteen BUFFALOS in the Forest were infested by 186 ticks, as shown in the table below. Seasonal data for males and females are in general similar to those obtained from ticks infesting giraffes in this area. The low incidence of infestation of these buffalos by H. truncatum is noteworthy.

TICKS FROM BUFFALOS

HOST MONTH A. VARIEGATUM H. RUFIPES OTHERS

G Q G. Q G Q 1-3 Feb 6 4. (R. longicoratus l (H. truncatum 7 6 4 Feb l R. E.T.simus" 16 4. 5 Mar 6 9 H. lepidum" l 6 Mar 2 7 Mar 2 l 8 Apr l H. truncatum l 9 Apr R. STEEms" l 10 Apr 'H. truncatum 18 ll Apr R. s. simus 4 l 12 May 2 3 13 May l 5 ll. May 2 15 Jun 18 6 16 Jun l 17 Jun 6 2 2 l 18 Jun 10 7 R. s. senegalensis 1. l l9 Jun 17 9 TOTAL 60 25 2l 18 47 15

Of the ANTELOPES, the TIANG was most common in the Forest area and all specimens observed were tick infested. When we arrived in February, approximately a hundred dried skins of tiang obtained earlier in the dry season were examined. Each bore from one to 23 dead nymphs of A. variegatum, the average number being in the vicinity of ten or twelve. A few dead male H. truncatum and A. variegatum also remained on the skins. Several hosts secured early in

« PreviousContinue »