KEY TO SUDAN SPECIES OF RHIPICEPHALUS MALES 1. Eyes convex or hemispherical, distinctly furrowed laterally or protruding from a depression ("orbited"). Coxa I with distinct dorsal projection...... ...2 *R. simpsoni (R. simus group), a small parasite of canerats only, typically bears this projection but this projection is so small and frequently so reduced that it is not considered distinct enough to include in this section. - 586 11 4. Lateral grooves faint, absent, or indicated only by a row of puncta tions. (Rare species)*..... Lateral grooves distinct as such.. 5. Scutal punctations in more or less Scutal punctations scattered, not 6. Posteromedian and paramedian grooves ..5 ..8 ..6 7 ..R. LONGICOXATUS Figures 273 and 274 .R. BEQUAERTI Figures 249 and 250 .R. ARNOLDI Figure 245 ..R. MUHLENSI Figures 281 and 282 *R. distinctus atypically may have apparently shallow lateral grooves due to the size and depth of the row of large punctations in its bed. 11. Scutal punctations either excessively 12. Scutal punctations not in these patterns, Scutum impunctate or with excessively Scutum with more, larger, and deeper ..12 ....16 ..R. SIMPSONI Figures 297 and 298 .13 *The linear punctation pattern of heavily punctate specimens of R. s. sanguineus in southern Sudan may be somewhat obscured by dense, moderately large interstitial punctations, but can be discerned by turning the specimen obliquely to the source of the light. 13. Posteromedian and paramedian grooves pronounced, deep, and wide*. Interstitial punctations varying from faint to large and numerous enough to some.. what obscure basic pattern of four rows of larger punctations. (Common, widely distributed in Sudan).... Posteromedian and paramedian grooves 14. Adanal shields elongately triangular Adanal shields either distinctly sickle ....R. S. SANGUINEUS Figures 289 and 290, 293 and 294. .14 ...R. S. SIMUS Figures 301 and 302 ..15 *This character is constant in this variable species in all but a very few individuals obviously misformed in several characters. |