one to twenty. The July-Aiigust figures probably represent the 

 peak reproductive season of A. variegatum . A single dry season 

 collection from Wau (February) , not Included in the breakdown above, 

 was exceptional in that eight females and 35 males were found on a 

 single cow. Nymphs were carefully searched for on many large cattle 

 herds in the Forest area in Febniary but fewer than a dozen were 

 found. This is in notable contrast to the invariable infestation 

 of tiang by nymphs in January and February. 



Other species common on cattle in this Province are B. deco_ 

 loratus and B. annulatus . In the dry season, B. decoloraTus" was 

 approximately ten times as common as B. annulaEus '^ during the 

 rains the ratio became more equalized~and in some collections B. 

 annulatus exceeded B. decoloratus in numbers. B. decoloratus Is 

 represented in all collections from this Province. Very light 

 infestations of H. rufipes are frequent but H. truncatum is rep. 

 resented by only seven adults in three collections. Exceptional 

 parasites of cattle are A. lepidum (three adults in two collec- 

 tions), R. s. siraus (six~adulls in two collections), and a single 

 female R. eT evertsi . This last named tick is so common on sheep, 

 goats, andequlnes in Bahr EL Ghazal that its almost con^jlete ab- 

 sence on cattle is striking; it is also common in Bquatoria Prov.. 

 ince collections from cattle. 



GOATS and SHEEP are infested chiefly by R. e. evertsi , most 

 collections containing only this species. Otler'ticks on "these 

 animals are A. variegatiun and B. decoloratus . 



UPPER NILE PROVINCE * 



Available data for this poorly explored Province refer chief- 

 ly to localities in the vicinity of Nile steamer wood stations and, 

 «Data for this Province are from several lots of specimens inT""" 

 Sudan Government and British Museum (Natural History) collections 

 and small amounts of material obtained by personnel of the Sudan 

 Veterinary Service and by the writer. In this report, some 

 references to Kenisa, on the Upper Nile_Bahr El Ghazal border, 

 are Included under the latter Province. 



- 817 - 



