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13. Coxa I with two robust posterior

spurs widely but not deeply divided.
Scutum distinctly wider than long;
margin abruptly converging posterior
of eyes; lateral grooves replaced by
four very large, deep punctations;
central field with only four to seven
large, deep punctations; cervical
grooves shallow but almost reaching
posterior margin...

Coxa I deeply divided...

14. Scutum with very short lateral
groove containing four to six
closely adjacent punctations;
several moderate size punctations
in central field; outline typically
shieldshape; cervical grooves narrow,
deep, and converging. A fairly small,
variable species..

Lateral grooves absent or very slightly
indicated posteriorly; scutal outline
not shieldshape. Moderately large
tick...

15. Scutum with lateral grooves absent or faintly indicated posteriorly; punc tations few, moderate size or fine; interstitials rare or obsolete; width lightly greater than length..

Scutum lacking lateral grooves; with
three to seven large punctations in
place of each groove and with an equal
number of same size in the central

field. Hyrax parasite. Other char
acters uncertain; see pages 638 to 640.

..R. CUSPIDATUS

Figures 259 and 260

...14

.R. TRICUSPIS Figures 319 and 320

..15

.R. LONGICOXATUS Figures 275 and 276

.R. ?DISTINCTUS Figures 263 and 264

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L6. Scutum with variable background of irregularly scattered fine to medium size punctations among which fewer larger punctations are more or less distinct; lateral grooves pronounced, long; outline distinctly longer than wide and with characteristically sinuous posterior margin...

17.

Scutum with scattered punctations not
as above; lateral grooves short,
poorly developed, or absent, never
rectilinear or deep..

Porose areas large, circular or sub...
circular; interval between these areas
no greater than their diameter. Scutum
with widely scattered fairly large punc....
tations and moderate number of superfi
cial interstitials of variable size;
outline somewhat wider than long or
length width ratio approximately equal;
lateral grooves short or indistinct;
cervical grooves shallow, indistinct,
may extend to posterior margin.
(Rare).....

Porose areas small or moderate, inter-
val separating them greater than their
own diameter.

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18. Scutum lacking lateral grooves; punc tations dense but superficial, medium size with finer interstitials, rare laterally anterior of eyes and on scapulae; posterior margin typically gradually rounded. (Rare)...

Scutal characters frequently modified
by crowding; lateral grooves superficial,
short to long; lateral ridges more or
less elevated; punctations widely spaced,
fewer laterally, small to moderate size,
interstitials rare or absent; posterior
margin abruptly rounded or slightly
tapering. (Common in restricted areas
only).....

.R. MÜHLENSI

Figures 283 and 284

..R. APPENDICULATUS Figures 243 and 244

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Figures 240 and 241, o, dorsal and ventral views Figure 242, d, variation in adanal shields Figures 243 and 244, Q, dorsal and ventral views

RHIPICEPHALUS APPENDICULATUS
Sudan Specimens

PLATE LXIX

- 599

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In the Sudan, R. appendiculatus is known only from Kajo Kaji and Yei on the west bank of Equatoria Province and from Katire (3500 feet elevation) and Ngangala (1700 feet elevation) on the east bank of Equatoria Province (Hoogstraal 19548).

The engorged nymph removed at Torit from the leg of one of our party who had just come almost three hundred miles from Kajo Kaji is a good example of how an important tick species may easily be spread far from its present range by modern, fast, transporta tion.

There appears to be little reason why R. appendiculatus should not be able to maintain itself east of the Nile in certain scattered areas of Torit District, though as yet it has been found only at Katire, which is cooler and more forested than are the plains. To the east and north of Torit District, conditions are most likely too arid for the brown tick. Most of the west bank of Equatoria Province is probably suitable for this tick.

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