RHIP ICEPHALUS FALCATUS Neumann, 1908, is a synonym of R. longus Neumann, 1907 (Zumpt 19428,1950A). R. falcatus was listed by King (1926) from the Sudan. Specimens in Sudan Government collections identified as this species by King refer actual ly to R. longus, R. supertritus, R. simus senegalensis, and R. sanguineus sanguineus. R. falcatus was originally rather vaguely described for the complex group in which it falls, and frequently the name has been used indiscriminately. RHIPICEPHALUS LUNULATUS Neumann, 1907. This name was used (Hoogstraal 19548) on the basis of Santos Dias' (1950D,1952C) assertion that this is a valid species, distinct from R. tricuspis Dönitz, 1906. Dr. G. Theiler, however, has studied this question so thoroughly (1955 correspondence) and con firmed her earlier findings (1947) so convincingly that R. lunulatus is herein used in synonymy under R. tricuspis. RHIPICEPHALUS MACROPIS Schulze, 1936 (C) is a synonym of R. san guineus sanguineus Latreille, 1806, according to Zumpt (1950A). The original specimens of R. macropis came from dogs in Port Sudan (Sudan) and Aden Arabia).

RHIPICEPHALUS PUNCTATISSIMUS Gerstacker, 1873, is a synonym of R. sanguineus sanguineus Latreille, 1806, according to Zumpt (1950A). R. punctatissimus was listed by King (1908, 1911) from the Sudan. Santos Dias (1952H,1953A,B) considers this to be a subspecies of R. sanguineus, and to be the same as R. sulcatus, but he has not examined type material or reared series.

(?) RHIPICEPHALUS SHIPLEYI Neumann, 1902. Type locality: "Soudan possibly meaning Anglo Egyptian Sudan (or "French Soudan'" i.e. French Equatorial Africa). Zumpt (1943A,1950A) has synonymized R. shipleyi under R. s. simus Koch, 1844.

RHIP ICEPHALUS SULCATUS Neumann, 1908. The material on which King's (1926) report of this species in the Sudan was based has pro ven upon comparison with Dr. Theiler's reared series of R. sulcatus and large numbers of other specimens to be heavily punctate individuals of R. s. sanguineus. R. sulcatus is known, however, by a few more recent specimens from the Sudan.

NAMES HEREIN CHANGED, SYNONYMIZED, OR PROPOSED

*AMBLYOMMA WERNERI WERNERI Schulze, 1932 (A) is synonymized under A. nuttalli Dönitz, 1909.

*APONOMMA HALLI Tendeiro, 1950, is synonymized under A. exornatum (Koch, 1844).

BOOPHILUS CONGOLENSIS Minning, 1934, is synonymized under B. annu latus (Koch, 1844).

HAEMAPHYSALIS LEACHII HUMEROSOIDES, a subspecies tentatively suggested by Theiler (1943B), is an elongate form of H. leachii leachii, so far as now demonstrable.

HAEMAPHYSALIS MUHSAMI Santos Dias, 1954 (E), is a subspecies of H. leachii.

***HYALOMMA SCUPENSE Schulze, 1919, appears from Soviet works to have distinct biological characteristics and minor morphological characteristics intergrading with H. detritum; it is therefore indicated as a "form" of yet unknown taxonomic status.

HYALOMMA IMPELTATUM Schulze and Schlottke, 1930, is considered to have priority over H. brumpti Delpy, 1946. H. erythraeum Tonelli Rondelli, 1932, is also considered to be a synonym of H. impeltatum.

HYALOMMA MARGINATUM Koch, 1844, is said by Pomerantzev (1950) to be a synonym of H. plumbeum (Panzer, 1795). This matter should be investigated by independent workers.

*The fact that these names have been modified or are considered synonyms has been mentioned in the preliminary publication on Sudan ticks (Hoogstraal 1954B), but the reasons for these changes are presented only in the present report.

**Non-Sudanese species.

HYALOMMA LEWISI Schulze, 1936, is a synonym of H. truncatum, not of H. excavatum as stated by Delpy (1949B).

**HY ALOMMA AEGYPTIUM PUNCTATA Schulze, 1919, is considered as a synonym of H. aegyptium.

**HYALOMMA ALBIPARMATUM Schulze and Schlottke, 1930, is raised from the status of a synonym of H. marginatum (= H. savignyi) (Delpy 1949B) and of H. truncatum (Feldman Muhs am 1954) to full species rank; H. impressum brunneiparmatum S. and S., 1930, is considered as a synonym of H. albiparmatum, not of H. truncatum as stated by Feldman Muhsam (1954).

**HY ALOMMA HUSSAINI Sharif, 1928, is treated as a valid species (not a synonym of H. excavatum cf. Delpy, 1949B) and most probably the proper type species of the subgenus Hyalommina, the previously designated type species of which (H. rhipi cephaloides Neumann, 1901) is no more than a misformed H. excavatum.

**HY ALOMMA TURANICUM Pomerantzev, 1946, is raised to full species rank and considered to be the same as H. rufipes glabrum Delpy, 1949.

HY ALOMMINA (Subgenus): See H. hussaini above.

MARGAROPUS REIDI SP. NOV. is described from males, females, and nymphs.

*RHIPICEPHALUS CUSPIDATUS Neumann, 1906, is shown to be actually different from the tick described and illustrated under this name by Zumpt (1950A) in his review of this genus.

RHIPICEPHALUS PSEUDOLONGUS Santos Dias, 1953 (D) is a synonym of R. Longus Neumann, 1907.

*The fact that these names have been modified or are considered synonyms has been mentioned in the preliminary publication on Sudan ticks (Hoogstraal 1954B), but the reasons for these changes are presented only in the present report.

**Non-Sudanese species.

Figures 4 and 5, d, dorsal and ventral views
Figures 6 and 7, o, dorsal and ventral views
KEY MORPHOLOGICAL CHARACTERS

HYPOTHETICAL σ and ticks, FAMILY IXODIDAE

(Characters used in keys in this report, except for self-explanatory terms, such as "caudal appendage" of certain Boophilus males. Additional characters used in fuller descriptions of individual species are explained where they first occur).

KEY TO FAMILIES AND GENERA OF ADULTS*

MALES AND FEMALES

A. Dorsum covered by leathery integument lacking scutum. Mouthparts ventral. Eyes absent, or present in lateral folds. Spiracular plates small, anterior of coxa IV. ("Soft ticks")..

B.

.FAMILY ARGASIDAE

Figures 8 to 63

.ARGAS

Figures 13 to 38

ORNITHODOROS

Figures 8 to 12, 39 to 63

Dorsum completely covered by scutum (08) or anteriorly covered by scutum (oo). Mouth parts anterior. Eyes absent, or present near lateral margin of scutum. Spiracular plates large, posterior of coxa IV. Hard ticks")......FAMILY IXODIDAE Figures 4 to 7, 64 to 316

*Characters in this key do not necessarily apply to species within the same genera from areas outside of the Sudan. Two other genera, Otobius (Argasidae) and Rhipicentor (Ixodidae), occur in the Ethiopian Faunal Region outside of the Sudan and are not listed in this key. A few other genera occur in other faunal regions. Another family, Nuttalliellidae, is known only from Southwest Africa.

**The peripheral differentiation of A. boueti and A. confusus is only slight and these species lack a lateral suture.