50 American Midland Naturalist Monograph No. 1 



Ornithodoros nicollei Mooser, 1932 



Plate 6, Figs. 19 and 22 



1932. Ornithodorus nicollei Mooser, original description, pp. 127-131, with figures. 

 1936. Ornithodorus nicollei Mooser: Brumpt, pp. 1210-1211. 

 Sexes similar; adults and nymphs similar. 



adult 



Body. — Broadly rounded at both ends, hood barely visible from above. 

 Size of female, 7.0 x 4.9 to 10.3 x 6.1; male, 5.0 x 3.5 to 7.10 x 4.2. 



Mammillae. — Numerous, moderate in size and on the dorsum about the 

 same in size throughout; smaller on the venter except at posterior end. Indi- 

 vidual mammillae sub-oval, conical, with their tops convex, smooth, and each 

 with a few small pits; sides with radiating striae which reach nearly to the 

 tops. Interspersed among the mammillae on both dorsal and ventral surfaces 

 are conical elevations which are truncated and each bears ' hair. 



Discs. — Small, depressed and not conspicuous; absent or obscure on venter. 



Legs. — Moderate in length and size, with the articles flared distally. All 

 tarsi with a conspicuous subapical dorsal protuberance and all except IV with 

 a prominent dorsal hump near the proximal end. Length of female tarsus I, 

 0.66; metatarsus, 0.57; length of tarsus IV, 0.72; metatarsus, 0.96. 



Coxae. — Coxae I and II slightly separated, all other contiguous. 



Hood. — Moderate, not continuous with the anterior extension of the 

 dorsal body wall. 



Camerostome. — Shallow. 



Cheeks . — Absent. 



Capitulum. — Basis capituli wider than long, narrower in front; surface 

 irregular, and with a group of short, heavy spines on each side behind. Palpi 

 large, article 1 tumescent with a knife-edge flange overlying the base of the 

 hypostome and with a row of spines on the median side. 



Hypostome. — Large and long, sides parallel, apex rounded; denticles in a 

 - ,'.) arrangement, all of about equal size and confined to about three-fifths of 

 the apical portion. Corona with numerous small denticles. Length, 0.6. 



Folds. — Coxal and supracoxal folds present. 



Grooves. — Dorso-ventral groove pronounced and visible in dorsal view. 

 Preanal, transverse postanal, and median postanal grooves pronounced; median 

 postanal groove continuous from near the anus to near the posterior margin. 



Sexual opening. — Placed at the level of the intervals between coxae I 

 and II. 



Eyes. — Absent. 



Anus. — In an oval pattern. 



