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The genus Mar aro , closely related to Boo ‘lus and con. fined to Africa 5'5 fiasagascar, consists of o wo species, M. winthemi Karsch, 1879, of southern Africa and Madagascar, and H. reidi s . nov. of the Sudan. Earlier assertions that M. winthemi is a South American tick apparently are erroneous. —
Usual remarks in the introductory sections for each genus
treated in the present work are, in the case of Mar aro , incorporated into the text below and do not require repetigion here.
Illustrations of nymphal M. reidi sp. nov. and of M. winthami, together with a review of the latter species, are given-'in t5 APPENDIX, pages 896 to 905. The unexpected circumstance of the very recent acquisition of the new species necessitates this treat. ment.
ICE! TO THE GHTUS MAR.GAROPUS*
Six pairs of hair tufts a.nd ventral hook
on posterior body margin; a caudal pro
jection present when engorged. Ldanal
shields sharply pointed distally, acces
sory shields absent. Scutal outline
convex laterally and bluntly rounded
posteriorly. Free segmentsof leg IV
as wide as long. (South African winter
Figures 3.59 3155155: 363 130 367
‘The characters provided in the key, together with those in the generic key, are sufficient to comprise an adequate diagnosis for
each species in this genus.
Dense row of scattered hairs on posterior
body margin; hook lacking; caudal pro.
jection not known to be present. Adanal
shields bluntly pointed distally; acces..
sory shields present. Scutal outline
parallel laterally and gradually rounded
posteriorly. Intermediate segments of
leg IV slightly longer than wide.
(Sudanese giraffe REIDI Figures 236'an'<!"!3'7
Palpal segments 2 and 3 not separated by a slight constriction; basis capituli dorsally three times as wide as long; porose areas transversely oval. Scutum widest at level of eyes , rounded posteriorlyiI0000000IOIOOOOOOOOIOOOOIOOIOIOOOOOIOOOO0IOOOOOIMI Figures '36l_E"3'@ 368 to 372 Palpal segments 2 and 3 separated by a slight constriction; basis capituli dorsally twice as wide as long, porose areas vertically subtriangular. Scutum widest midway between sc apulae and eye leve1,b1unt1y pointed posteriorly.........................M. REIDI
Figures 236 and 237, 0‘, dorsal and ventral views Figures 238 and 239, 9, dorsal and ventral views
MARGARUPUS REIDI SP. NOV.
Bahr El Ghazal: All from Giraffa camelo ardalis subsp., E. T. M. Rad Ie 1. : Liednhom (south bank of Jur River); 1468", l , from muzz a, March 1955. One nymph, same locality, 8 March 195 . Twenty..four nymphs, Guar, Galual_Nyang Forest, 15 May 1953.
M. reidi sp. nov. is known only by the above specimens from the Sudan. It is related to the South African winter horse tick, M. winthemi, the range of which is charted by Theiler and Salisbury -(1936,. The small males may easily_have been overlooked by ear. lier collectors and the larger females may previously have been quickly identified as Boophilus by nonspecialists. More careful search should reveal t e wi er distribution of this interesting tick in the Sudan and possibly elsewhere in Africa. See M.
winthemi (page 900) .
The only known hosts are three specimens of the western Su..
danese form of giraffe, Giraffa camelo dalis subsp., the actual subspecific identity of wfich is consigered 5; Setzer (1956) to
be a moot subject that cannot presently be decided. See l_'I. winthemi (page 900).
Unstudied. See g. winthemi (page 900).
DISEASE REATION S
_l_4. winthemi and r_4. reidi sp. nov. are readily distinguished by key characters (pages 572 and 575).
The HOLOTYPE d‘ is deposited in the United States National Museum, number 2225. The ALLOTYPE Q is deposited in the same institution, together with one of the PARATYPB nymphs collected on 15 May 1953. The data for these specimens are presented a. bove. A single 6‘, Q, and nymph (15 May 1953) PARATYPE are depos_ ited in the Onderstepoort collection (Dr. G. Theiler), East African Veterinary Research Organization (Miss J . B. Walker), British Mu... seu (Natural History), Rocky Mountain Laboratory, and Chicago Natural History Museum. The remainder of the PARATYPB material is in the writer's collection.
MALE (Figures 236, 237, 31.2 to 31.6): Len h overall approx_ imately 3.0 mm. , width approximately 1.1. mm. 0 or (dry) dark reddish brown, legs yellowish; integument white, yellowish, or dark brown. Outline oval with integument bulging beyond scutum laterally and posteriorly, but lacking cauial protrusion (available specimens are moderately engorged).
Ca itulum: Basis ca ituli twice as wide as long; lateral margins markedly diverging anteriorly, basal margin slightly concave; dorsal surface bearing a horizontal row of twenty hairs at level of midlength; ventrally more elongate, length and width equal, lateral margins slightly concave, basal margin convex. Palpi comparatively short; overall length and width of each palpus approximately equal; segment 1 forming a short, wide pedicle for segment 2. Segment 2 subquadrate, approximately twice as wide as long; outer margin slightly expanded basally, inner margin