612 MEDICAL ENTOMOLOGY 



parasites of wild animals ; some are found on domestic animals and 

 several species occur on birds, and a few on reptiles. Except for 

 Amblyomma hebraeum the other species are of little or no practical 

 importance. 



Donitz has pointed out that the males of Amblyomma often have 

 small ventral plates in front of the festoons. These plates, however, 

 differ from those of Hyalomma and Rhipicephahis in that they are 

 deeply embedded in the integument and are quite immovable ; Donitz 

 believes that they are not homologous with the true anal plates of the 

 two genera mentioned above. 



Neumann gives the following key for the determination of the species : 



NEUMANN'S KEY TO THE SPECIES OF AMBLYOMMA 



MALES 



1. Eyes flat, not prominent ........... 2 



Eyes spherical ............. 53 



2. Scutum with marginal groove completely contouring the 



posterior border ............ 3 



Scutum with no marginal groove or an incomplete one ..... 20 



3. Coxa I without long sub-equal, conical, contiguous spurs . , 4 

 Coxa I with two very long, sub-equal, conical, and contiguous 



spurs '......, 19 



4. Coxa I with two spurs or simple tuberosities ....... . . . 5 



Coxa I with one long spur maculatum 



(United States; California; Texas; Tennesse ; Mexico; Brazil; Peru; Paraguay; 



Uruguay ; Argentine Republic ; Chili ; Patagonia.) 



5. Coxa IV with a spur as long or nearly as long as the coxa .... 6 

 Coxa IV with spur much shorter than that article ...... 8 



6. Scutum without punctations on the triangular projections, 



shallow and radiating in posterior half cajennense. 



(Central and South America ; Cuba ; Jamaica.) 

 Scutum with punctations distributed over its entire surface .... 7 



7. Coxa IV with a spur slightly longer than the coxa ; capitulum 



long with short base americanum. 



(United States ; Guatemala; Brazil.) 

 Coxa IV with a spur twice as long as the coxa ; capitulum 



short with long base neumanni. 



(Argentine; Patagonia.) 



8. Coxa IV with a spur half the length of the coxa ...... 9 



Coxa IV with a very short spur . . . . . . . . .10 



9. Coxa I with two strong equal spurs ...... coelebs. 



(Bolivia.) 



Coxa 1 with an external spur double the length of the internal crenatum. 



(Cape of Good Hope ; Liberia ; South India.) 



