418 



BUREAU OF ANIMAL INDUSTRY. 



.1. — Female. 



1. Palpi flat dorsally , sides straigh t or co7ivex _ 2 



Palpi short, thick, angular, second and third articles each drawn out laterally 



to a sharp point {Boophilus) , 12 



2. Scutum broiun or brovmish „ 3 



Scutum ivhite (ZanyAhsir) R. pulcliellus. 



3. Abdomen of uniform color 4 



Abdomen with white lines and ])olvts (Zanzibar) R. perpulcher. 



4. Scutum elongate oval 5 



Scutum short oval or as broad as long 8 



5. Scutum decidedly emarginate in front 6 



Scutum slightly emarginate in front (Zanzibar) E. brevicollis. 



6. Scutum with unequal {large and small) punctations (Europe, Asia, Africa, Austra- 



lia, Philippines, Central America) R. sanguineus. 



Scutum with equal punctations 7 



7. Punctations linearly arranged, feiv in number (Sumatra) R. paulopunctatus. 



Punctations numerous (Africa) R. punctatissimus. 



8. Anal valve not bordered tvith white 9 



Anal valve bordered with white (Egypt) D. rutilus. 



9. Scutum tvith distinct punctations 10 



Scutum rough (shagreened) 11 



10. Punctations equal, close together (Europe, Africa, West Indies) R. bursa. 



Punctations unequal, separated (Africa) R. simus. 



11. Scutum not rough on margins; eyes light (South Africa) R. capensis. 



Scutum rough (shagreened) on entire surface; eyes dark (South Africa) R. Evertsi. 



12. Scutum elongate, sides convergent back of the eyes (see p. 420).. R. annulatus. 

 Scutum oval, sides not convergent back of the eyes (Africa) (see p. 433) . R. decoloratus. 



B.—Male. 



13. Palpi flat, sides straight or convex 14 



Palpi short, thick, angular; second and third joints each drawn out laterally 



into a sharp point (see Boophilus, p. 419) R. annulatus. 



14. Scutum of uniform color 15 



Scutum black and white (Zanzibar) R. pulchellus. 



1 5. Marginal groove of shield single 16 



Marginal groove of shield double (China) R. carinatus. 



1<). Scutum ivith numerous punctations 17 



Scutum with few large 2^unctations linearly arranged 22 



17. Punctations unequal {large and small) 18 



Punctations equal or nearly so 19 



18. Punctations distributed regidarly (Europe, Asia, Africa, Australia, Central 



America) R- sanguineus. 



Punctations distributed irregularly (Africa) - R- punctatissimus. 



19. Punctations separated {distant).. 20 



Punctations contiguous, making scutum rough {shagreened) 21 



20. Punctations fine, covering entire surface (Europe, Africa, West Indies)... R. bursa. 

 Punctations deep, absent from rnarghi and marginal shields (Nubia) . . R. cornpositus. 



21. Postero-marginal festoons with white border (South Africa) R. capensis. 



Postero-marginal festoons of uniform color, only slightly distinct (South 



Africa) R- Evertsi. 



22. Scutum {of young specimens) cover entire dorsal surface (Africa) R. simus'. 



Scutum {of young specimens) absent from the margin (Sumatra). R. paulopunctatus. 



