592 MEDICAL ENTOMOLOGY 



FEMALES * 



1 . Anal groove prolonged behind the anus . . . . . . ... 2 



Anal groove forming a circle round the anus . _. . . rasus 



2. Anal groove with parallel or divergent arms . . . . 3 

 Anal groove with markedly convergent arms 41 



3. Coxa I with internal spur . . . . . . . . . . 4 



Coxa I without internal spur . . . . . . . . . .29 



4. Coxa I with a very long internal spur ........ 5 



Coxa I with a short internal spur . . 19 



5. Basis capituli with hump on ventral surface below each palp .... 6 

 Basis capituli without ventral hump . . . . . . . .15 



6. Coxa I without external spur .......... 7 



Coxa I with external spur .......... 9 



7. Scutum with lateral grooves .......... 8 



Scutum without lateral grooves ...... spinicoxalLs 



(Sumatra.) 



8. Porose areas large, somewhat near each other . . . ricinus 

 Porose areas small, widely separated ..... dentatus 



(United States.) 



9. Second article of palps much longer than the third . . . . . 10 

 Second and third articles of palps sub-equal . . . . , , 13 



10. Tarsi tapering, without dorsal protuberance . ...... 1 1 



Tarsi with dorsal protuberance near the extremity . . . fossulatlis. 



11. Ventral hump on basis capituli reduced to a tuberosity . . affinis. 



(Costa Rico ; United States.) 

 Ventral hump on basis capituli longer than broad 12 



12. External spur of coxa I as broad as it is long, hypostome with 



six rows of teeth ......... fuscipes. 



(Brazil.) 

 External spur of coxa I longer than broad, hypostome with 



eight rows of teeth bicornis. 



(Mexico.) 



13. First segment of palp prolonged ventrally to a point . . diversifossus. 



(New Mexico.) 



First segment of palp not prolonged . . , . . . , .14 



14. Scutum longer (1 '3 mm.) than broad (1'25 mm.) . . . boliviensLs. 

 Scutum much longer (1'4 mm.) than broad (0'9 mm.) . . acuminatus. 



15. Tarsi without dorsal hump near the extremity . . . . . . . 16 



Tarsi with dorsal hump near the extremity t cookei 



16. Coxa I with external spur much shorter than the internal . . . 17 

 Coxa I with external spur nearly as long as the internal . . acutitarsus. 



(India ; Japan ; Formosa.) 



17. Scutum oval 18 



Scutum sub-circular . sculptus. 



(California.) 



18. Scutum with very fine punctations, tarsi long and thin . . nigricans. 



(Madeira.) 

 Scutum with large punctations, tarsi short and humped . . rubidus. 



(Mexico.) 



* When the distribution is given for the male, it is not repeated for the female ; in the 

 case of species described in the text the distribution is given there. 



