of this tick more accurate data concerning its hosts and biology are bound to result. Hosts of the immature stages are unknown, except for a single nymph (J. B. Walker, correspondence) from an African civet in Tanganyika. Domestic animals: Cattle (Sudan and Walker's Kenya records, above). Dog (Santos Dias 1953B). Wild animals: Bushbuck and giraffe (Zumpt 1943B). Roan antelope (Zumpt 1943B, Hoogstraal 1954C). Nyasaland warthog (Theiler 1947). Buffalo, nyala, and South African bushbuck (Santos Dias 1950B,1953B). Impala, sable antelope, suni antelope, reedbuck, greater kudu, Cape duiker, Zambesi eland, wart hog, and buffalo (Santos Dias 1953B). Kudu (Walker's Kenya record above). Theiler's (unpublished) host records (number of hosts, if more than one, indicated in parenthesis) are: from Mkuzi Game Reserve, Zululand, impala, nyala bushbuck (3), reedbuck (2), duiker (4), steenbuck, warthog, and bushpig; from Ubombo Flats, Natal, nyala bushbuck. In Miss Walker's collections (corres pondence) from large numbers of game animals from Tanganyika, 19 males from two buffalos are represented. BIOLOGY This species is now being reared at Onderstepoort (Theiler, correspondence). Unstudied. DISEASE RELATIONS REMARKS The Sudan material recorded above was compared by Dr. G. Theiler with type material in Dr. F. Zumpt's collection. IDENTIFICATION Male: A distinct, long dorsal process of coxa I associates this species with the R. appendiculatus group of Zumpt (19420) but peculiar scutal characters place it with the R. aurantiacus group (1943B) to which it is referred, not, however, for reasons of indicating phylogenetic relationships but rather for the sake of convenience. Lateral grooves are indicated by a row of some what dense and regular punctations, though shallow lateral grooves as such may be present just anterior of the proximal festoons. Posteromedian grooves are shagreened, distinct, long, and narrow; paramedian grooves are shorter and wider, also shagreened. Punc tations are of medium size, fairly superficial, and moderately dense; some fine interstitials may be apparent, especially lat erally. The basis capituli is strongly angled laterally in small specimens (2.2 mm. long; 1.3 mm. wide) but more blunt and elon gate in large specimens (4.7 mm. long; 2.6 mm. wide) (as in R. appendiculatus). It should be noted that in the specimen illus trated (Figure 281), the basis capituli is exceptionally short and wide. The adanal shields (Figure 282) are most characteristic though in some individuals the width of the posterior section is not so great as in the specimen illustrated. The body greatly bulges posteriorly upon engorgement and the median festoon pro trudes. Long, pale hairs are especially conspicuous on numerous specimens in the present collection and should receive further study. Female: The elongately ovoid scutum of this small species lacks lateral grooves and has punctations like those of the male; punctations are rare laterally anterior of the flat eyes and on the scapulae; cervical grooves are faintly indicated if at all. The basis capituli appears to be more consistently sharply angled than that of the male, but this might be a variable character. Figures 285 and 286, o, dorsal and ventral views Figures 287 and 288, o, dorsal and ventral views RHIPICEPHALUS PRAVUS PLATE LXXX - 673 RHIPICEPHALUS PRAVUS Donitz, 1910(B) (R. NEAVI Warburton, 1912, R. NEAVI PUNCTATUS Warburton, 1912; and others) Atelerix pruneri oweni Mar Dec Feb Feb Dec Aug domestic cattle domestic cattle Poelagus marjorita oweni Torit 58 58 Lodwara domestic cattle Sep 1 8 Goniryo domestic cattle *Unfed adults taken leaving host after molting. Mar R. pravus is known only from Eastern and Torit Districts of Equatoria Province. Although absent or rare west of Torit District, apparent ecological preferences indicate that it may be expected to occur in Upper Nile Province, to the north of eastern Equatoria. Some of the above-mentioned collections have already been quoted by Theiler and Robinson (1953B) and Walker (1956). Except for a few Kapoeta specimens, none from the Sudan have been found in Sudan Government collections or in British Museum (Natural History). DISTRIBUTION The drier areas of East Africa appear to be the center of distribution of R. pravus, which also extends into Central and Southern Africa and may range just inside the borders of West Africa. This species is often common in the localized areas where it occurs. WEST AFRICA: NIGERIA (As R. neavi punctatus: Gambles 1951. Walker 1956). CENTRAL AFRICA: CAMEROONS (Unsworth 1952). BELGIAN CONGO and RUANDA URUNDI (Theiler and Robinson 1953B,1954, and Walker 1956 presume that R. pravus is the actual identity of the "R. |