Page images
PDF

possibility that this important species ma some day be introduced into the Sudan. This is the only Sudanese species in which the male scutal punctations are large, deep, dense and noncontiguous centrally, the margins are wide and glossy, and the posterior grooves are narrow. The dense, uiform female scutal punctation, the glossy, smooth scutal periphery, and the wide, regular scutal outline easily distinguishes this sex in the Sudan fauna.

[subsumed][subsumed][graphic][subsumed][graphic][graphic][merged small][merged small][merged small][merged small][merged small]
[merged small][graphic][merged small][graphic][merged small][merged small]

Bahr E1 Ghazal: GaluaL.Nyang Forest, 1% and 3199 from two warthogs, Fhacochoerus aethiopicus subsp., and 16' from ground, 21

and 23 February I§§f§, H. . e ; &i‘. 6&9, same locality and host species, 7 June 1953, E. M. Reid a it. These are the only specimens of this interesting West rican tick from the Sudan.

[graphic]

DISTR IBUT ION

This West African warthog and aard..vark parasite ranges eastward as far as the western part of southern Sudan.

WEST AFRICA: FRHCH WEST AFRICA (Neumann 1905,1911. Theiler 191.7. NousseIot 1951 ,l953B. Specimens from Fort Foureau and French Sudan, collected by Rageau and Rousselot, are present in the Theiler collection. It seems likely that the "R. com anatus" reported by Fiasson (19433) from wild pigs refers aEtuHI§ to N. cus idatus. Pcxrrucmz cumin (As R. sp.: Tendeiro 191.8. As E. 'E1'a"€-eusg a us: Tendeiro 1951A,n,1952L',1953,195z.).

[merged small][graphic][merged small]

Note: Stella (1940) listed E. cus idatus from the Harrar area Fipfithiopia. Pending further inve&IgatIon, this record is considered questionable.

[graphic][merged small]

HOSTS

Warthogs, Phacochoerus aethio icus subsp. (Neumann 1906,1911, and Sudan records a$ve,. A~ afer senegalensis (Rousselot 1951 ,1953B , Tendeiro 195$ .

[graphic]

BIOLOGY

It seems strange that this large tick from zmich.-himted warthogs should not have been more often reported from West Africa, though misidentification of specimens may account for this situa

tion.

DISEASE RHATIONS

Ten of the above..mentioned -Sudanese female specimens were inoculated into mice and guineapigs in the Cairo laboratories of Naval Medical Research Unit No. 3, for attempted isolation of viruses or rickettsiae. The host animals produced no sign

of infection .

It is claimed that specimens naturally infected with Q fever (Coxiella burnetii) occur in Portugese Guinea.

[graphic]

REMARKS

It was impossible to identify with certainty the Sudan specimens and some were sent to Dr. Theiler. She had received similar material from French West Africa (noted above) and found that it corresponded to Neumarm's (1906) description of R. cus

idatus but differed markedly from Zumpt's (19501) 1nte1-51-e'F'e_ £101‘! of this species. Thereupon she sent the French West

Africa specimens to Dr. D. R. Arthur for comparison with the

R. cus idatus type specimens in the British Museum (Natural History]. He found these to be the same. What the tick reported

by Zumpt (55. 213.) as 5. cuspidatus should be called is not known.

'R. cus idatus falls into the subgenus Rhi ice halus sensu strictu) o ump (l95OA) and not in Rhi ice hglus {H which he pIac§d the species attributed by him to @515 name.

IDENTIFICATION

Males are readily recognized by the unique internoposterior curved or straight, pointed projection of the adanal shields, which reach to the festoons. (Slight variations in these projections'have been illustrated by Tendeiro l95lE). The width of the adanal shields, which is almost half as great (at the posterior two_thirds) as the total length, is also distinctive as is the broadly triangular shape of the anterior two_thirds, the acutely rounded and posteriorly sloping posterior margin, and the concave emargination of the posterior half of the inner border. Accessory shields are absent. Dorsally, a small rounded (not pointed) dorsal projection of coxa I is visible. The scutum is remarkabl flat and broad, three.fourths as wide as its Iength' rom sea as £3 pdsterior margin; its surface is smooth except for twelve to twenty widely scattered, large, deep punctations, six or eight small, deep ones, and two short, posterior rows of three or four adjacent, large, and deep punctations. Many specimens have one, two or three mild longitudinal depressions at one place or another on the scutal surface; these are obviously due to injury, crowding, malnutrition, or melting conditions. The deep lateral grooves, which are marked by a row of large, adjacent punctations, begin at the first festoon and extend to the level of coxa III; thence they continue anteriorly as a curved row of four equidistantly spaced, large, deep punctations. The very deep cervical grooves are parallel or slightly convergent and short, reaching only the level of trochanter II. The impuctate basis capituli is three times as wide at its anterior third as its total width. Unfed specimens are reddish brown, engorged individuals are an intense black with reddish.brown legs. Overall length varies from 3.50 mm. to 4.90 m.; width from 1.98 mm. to 2.54 mm

Females unengorged average 4.40 mm. in overall length and 2.70 mm. in width; our largest engorged specimen is ll.0O m. long and 6.30 mm. wide. The scutum is distinctly wider than long; lateral margins diverge gradually to the midlength of the scutum from whence they rather abruptly converge as a straight or slightly

[graphic]
« PreviousContinue »