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ARGASINA. 
Fic. 1.—Rynchoprium spinosum, dorsal view ; 1a, ventral view ; 1b-17, details of same. 
Fic. 2.—Ornithodorus americanus, dorsal view ; 2a, ventral view ; 2b-27 detuils of same. 
Fic. 3.—Argas americanus, dorsal view ; 3a, ventral view ; 3b, side view of ventral portion ; 3c, larva, 
dorsal view ; 3d, larva, ventral view ; 3e-3k, details of same—all highly magnified (from Marx). 
