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necessary before any final judgement on all subspecies and related species may be vouchsafed.

Speciation in this genus has been extremely conservative and restricted geographical “species” do not appear to have evolved. Many superficial "morphological variations“ derive from degree of engorgement, method of preservation, or angle of examination.

Boophilids are exceptionally difficult to study taxonomically owing to superficial variability, small size, and crowding of diagnostic characters. The state of engorgement of many routinely. collected females tends to modify certain features so that they are frequently difficult to evaluate.

For discussion of the Sudan Boo hilus fauna in relation to that of North Africa, southern Europe, i the Near East, see REMARKS under §. annulatus below.

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Without caudal appendage. H stome

dentition L/4 (see Note below . Palpal

basal segment without ventral bristle.

bearing protuberance on inner margin.

Adanal shields without posterior spu..............§. ANNULATUS
Figures l~

2. Hypostome dentition 3/3 (rarely 3.5/ 3.5). Palpal basal segment with ventral, inner bristle_beaing protuberance. Adanal shields with long, narrow internal spur usually extending beyond body margin...............................B. DECOLGRAIUS

Figu:-Es '1'O'8"E'I'G§

Hypostome 4/L. Palpal basal segment

without ventral, inner bristle_bearing

protuberance. Adanal shields with

inner margin hardly extended if at all

and not reaching body margin.....................§. MBCROPLUS** Figures'II§-553-113

[graphic]

*Preserved specimens must be entirely free of surface sheen from liquid preservatives before identification can be attempted. The caudal appendage of d‘B. decoloratus is very variable in size and the palpal basal bristle_bearing protuberance of either sex can be seen only when the mouthparts are absolutely clean; the bristles are frequently broken off. Turning the specimen at an angle to the light may be necessary to see this character as well as the groove of coxa I.

**B. micro lus does not occur in the Sudan but there is some likelihood a 1 may reach the Sudan within a few years. The inclusion of §. microplus in this key makes it serviceable for all known species, accor ing to contemporary concepts of the genus.

FEMALES

1. Coxa I with shallow, rounded emar_
gination separating internal and
external spu. Palpal basal segment
and hypostome as in ma1e...........................B.

ANNULATUS Figures lO6,'I07:'§§d_II7

Coxa I with deep elongate “inverted
V". SPWSOIQQCOOIIIIOOIIOIOOIIOOOOIQIOOIIO2

2. Hypostome 3/3 (rarely 3.5/3.5). Palpal basal segment with ventral,

inner bristle-bearing protuberance...............B. DECOLORATUS Figures 1102 l~

Hypostome 4/4. Palpal basal segent

ventrally with inner margin concave

and lacking bristle-bearing protuberance............................................B. MICROPLUS

Figures 114, I15,E‘1‘.l‘8

Note

The number of longitudinal files of denticles on each side of the hypostome is expressed by a formula such as 4/4 or 3/3. The number of these files is constant in most species of ticks, but the number of denticles in each file may be more variable. The formula 3.5/3.5 indicates that there are three complete and one shorter file of few denticles anteriorly on each side of the hypostome.

Following Minning, the length/width ratio of the female scutum has usually been considered to be an important diagnostic character. Examination of large numbers of field-collected specimens from Africa and elsewhere reveals wide variation in this feature within eaph species and no valid data for diagnostic puposes.

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Figures 104 and 105 , 6, dorsal and ventral views
Figures 106 and 107, Q, dorsal and ventral views

BOOPHILUS ~S
Em speci mens

PLATE XDCIV

.. 297..

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L N 9 d" EQUATCBIA PROVINCE RIIJORDS

3 2 Meridi Taurotr derbianus gigas Feb (svs)
l Nagichot domegtic cattle Dec
1 Katire domestic cattle Jan
1 Torit domestic cattle Nov

9 39 10 Tombe domestic cattle Mar ESVS)
10 2 Muni domestic cattle Mar svs)
lO Teralneka domestic cattle Mar (SVS)
l Yambio domestic cattle J an
11 Meridi domestic cattle Feb (svs)

DISTRIBUTION N THE SUDAN

In addition to the above Equatoria Province specimens, the following others have been seen, _z1'l_.l from cattle except those which

were collected at Wan from donkeys:

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[graphic]

Q 6' Locality Province Date Collector

11 1 Malakal Upper Nile Jan 1952 1. M. Dahab (SIS) 1. 1 Ler Upper Nile Jan 1952 1. w. Polden (svs) 1 Bor Upper Nile Jan 1952 P. Durran (svs)

e 2 Akobo Upper Nile Mar 1911. c. webb (sac)

11 5 Lau Ba.hr El Ghazal Jan 1911. J. J. Soutar (sec) 6 Wau Bahr El Ghazal Sep 1950 12:. '1'. M. Reid (S18) 2 Han Bahr El Ghazal Feb 1953 H. Hoogstraal 7 l Wau Bahr El Ghazal Feb 1953 Gordon College Collection

29 1 we Bahr El Ghazal Jul 1953 E. T. M. Reid (SIS)

18 1 Fanjak Bahr El Ghazal Jan 1953 H. Hoogstraal
2 1 Fanjak Bahr El Ghazal Mar 1953 E. T. 14. Reid SIS

34 19 Yirol Bahr El Ghazal Apr 1954 E. '1'. M. Reid SV8

19 3 Talodi Kordofan Dec 1926 J. v. Gowland sec
3 Wadi Halfa Quarantine Station from Kordofan cattle K10)

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