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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.
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
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
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
*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.
1. Coxa I with shallow, rounded emar_
ANNULATUS Figures lO6,'I07:'§§d_II7
Coxa I with deep elongate “inverted
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
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.
Figures 104 and 105 , 6, dorsal and ventral views
L N 9 d" EQUATCBIA PROVINCE RIIJORDS
3 2 Meridi Taurotr derbianus gigas Feb (svs)
9 39 10 Tombe domestic cattle Mar ESVS)
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:
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
34 19 Yirol Bahr El Ghazal Apr 1954 E. '1'. M. Reid SV8
19 3 Talodi Kordofan Dec 1926 J. v. Gowland sec