62 American Midland Naturalist Monograph No. 1 



Ornithodoros parkeri Cooley, 1936 

 Figs. 25, 26. 27. 28, 29, 30, 32 and 34 



1936. Ornithodoros parkeri Cooley, original description, pp. 431-433, with figures. 



1937. Ornithodoros rvheeleri Mclvor, original description, pp. 365-367, with figures. 



Sexes similar; nymphs and adults similar. 



ADULT 



Body. — Oval, a little broader posteriorly; hood visible from above. Size of 

 female 7.10 x 4.50 to 5.82 x 3.75. Size of male 5.75 x 4.00 to 5.0 x 3.25. 



Mammillae. — More numerous and smaller than in tnncata, a little larger 

 at the sides and largest of all at the posterior end, smallest in the mid-ventral 

 region. The individual mammillae smooth, convex on top and in the convexity 

 are usually present a few very small pits. Sides of the mammillae with radiat- 

 ing ridges. Mammillae more crowded together, less elevated and with the radi- 

 ating ridges at their bases less visible than in turicata. Interspersed with the 

 mammillae are smaller conical elevations, each with a hair arising from an 

 apical pit. Hairs sparse or absent on the ventral surface. 



Discs. — Discs distinct, small and depressed; absent on the ventral surface 

 except in the grooves where they are in lineal arrangement. 



Legs. — Long and moderate in size, a little heavier than in turicata, with 

 articles mildly flared distally. Surface of the legs smooth (without micro- 

 mammillae or granulations) . Short hairs moderate in number. Tarsi I, II and 

 III with moderate subapical dorsal protuberances; small or absent on tarsus 

 IV. Tarsus I with three or four dorsal humps; metatarsus with four dorsal 

 humps. Tarsus IV with no dorsal humps. Length of female tarsus I, 0.69; 

 metatarsus, 0.57. Length of female tarsus IV, 0.96; metatarsus, 1.11. Length 

 of male tarsus I, 0.6; metatarsus, 0.51; length of male tarsus IV, 0.75; meta- 

 tarsus, 0.81. 



Coxae. — Coxae prominent, progressively larger anteriorly. Coxae I and II 

 a little separated; all others contiguous. 



Hood. — Large, prominent, not continuous with the body wall of the 

 dorsum. 



Cheeks . — Absent. 



Capitulum. — Basis capituli about as wide as long, a little larger than in 

 turicata; surface irregular and with transverse wrinkles; with a group of hairs 

 on each side. Palpi moderately long, longer than the hood; all articles smooth. 

 Article 1 with a thin flange on the median side extending the full length of 

 the article and projecting over the basal portion of the hypostome. 



Hypostome. — Long, with sides about parallel, rounded apically. Denticles 

 in a 2 / 2 pattern covering about the distal half, and with teeth in lateral and 



