Fiaterial referred to as R. sulcatiis by Enigk and Grittner 

 (1953), in their remarks on tlie breeding and biology of ticks, 

 should be re-examined for identity. 



IDEOTIFICATION 



The diagnosis presented below is modified from Theiler and 

 Robinson (1953B). 



Male ; Size small, averaging 2.5 mm. long and about 1.5 ram. 

 wide (Neumann's specimens from 2.9 mm. to 3.4- mm. long and from 

 1.5 mm. to 1.8 mm. wide). Scutxim narrow anteriorly, widening 

 posterior of level of eyes, surface slightly convex, shiny. 

 Lateral grooves discrete and pronounced, may contain large punc- 

 tations; in some specimens extended to incli^ie penultimate fes- 

 toon. Posteromedian and psiramedian grooves widely elongate, 

 wrinkled. Punctations deep, medium to large size, dense, some 

 confluent; fewer laterally but some on festoons, scapulae, and 

 lateral folds. Eyes flat, may be bounded by a few large puncta- 

 tions. Coxa I may have a dorsal, unpointed hump. Basis capituli 

 one and a half to two times as wide as long, with pronovinced 

 lateral angles at anterior third of length (Neumann's original, 

 frequently reproduced illustration of this species shows the 

 basis capitiili extremely wide and pointed, most probably the 

 artist's impression, dravm foreshortened, gained from a downward- 

 pointing capitulum). Adanal shields typically like those of large 

 R. s. sanguineus but in some specimens they may be more elongately 

 roiinded and the inner margin emarginate (as is common in smaller 

 R. s. sanguineus); an approach to the sickleshape is seen in a 

 "smaTl Sudan male. 



Female ; Medium size, unengorged about 3.00 ram. long and 

 1.75 mm. wide (Nevunann; 3.0 ram. x 1.5 mm.). Scutum flat, shiny, 

 rich brown, emargination wide; as broad as long or slightly 

 longer than broad, but appearing long due to the pronounced 

 lateral grooves and the somewhat tapering, sinuous posterior 

 margin (Neumann; 1.5 mm. x 1.25 mm.). Cervical pits short, 

 deep; cervical grooves short and inconspicuous. Lateral grooves 

 pronounced, with external ridge, and picked out with irregular 

 punctations which may be confluent. Eyes large, flat, flush 

 with s-urface, may be bounded dorsally by a few large confluent 



_ 765 - 



