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American Midland Naturalist Monograph No. 1 



but lacking a dorsal plate. Leg I distant from the insertion of the mouth parts. 

 Legs II, III, and IV separated by about the same distance as that from leg I 

 to the mouth parts. 



Basis capituli long with a knob on each side and with two horns on the 

 posterior corners. Mouth parts very long and slender; mounted in balsam, 

 articulation between palpal articles 1 and 2 not visible. 



Hypostome long and narrow, denticles 2 / 2 ; principal denticles in the lateral 

 files relatively long and sharp, except at the base where they are rounded and 



Fig. 48. Ornithodoros viguerasi Cooley and Kohls. A, Capitulum of adult, ventral 

 view. B, Intercoxal area and coxae of nymph. C. Capitulum of larva, ventral view. 

 D, Leg I of nymph. E, Leg IV of nymph. 



