Cooley & Kohls: Argasidae of N. America, etc. 109 



blunt, those of the median files small and short. Posthypostomal hairs very 

 small and short. Length about 0.27. 



It is notable that while the large, fed larva measures 2.64 in length, the 

 adult measures only 3.12. 



HOST AND DISTRIBUTION 



This species is known only from a bat cave, Cueva Somorrostro, Jamaica, 

 Cuba, inhabited by Phyllonycteris poeyi Gundlach. One adult and several 

 nymphs were collected from the walls of the cave; three nymphs and four 

 larvae were from a bat. The collections were made in September, October, 

 and November, 1940. 



Ornithodoros azteci Matheson, 1935 



Plate 12, Figs. 49 and 50 



1935. Ornithodorus azteci Matheson, original description, pp. 349-351, with figures. 

 1941. Ornithodoros anduzei Matheson, original description p. 3. 



Sexes similar; adults and nymphs similar. 



ADULT 



Body. — Pyriform, broadly rounded behind and pointed in front, narrow- 

 ing gradually from behind the third pair of legs. Size 4.5 x 3.0. 



Mammillae. — Large and distinct in the marginal areas, small and not well 

 formed in the median area. Individual large mammillae subhemispherical, 

 with the surfaces of the sides irregular and with a few faint, radial striae; 

 usually with a crater and a short hair on top. On the venter mammillae faint 

 or absent except in the peripheral areas; short hairs more abundant in the 

 posterior area. 



Discs. — Round or oval, faint, superficial, moderate in size, and evident 

 only as modifications of the surface of the integument. 



Legs. — Moderate in length and size; surface faintly micromammillated or 

 granular, not shining. Hairs numerous, short except on the terminal articles 

 where they are longer on the ventral side. Subapical dorsal protuberance mod- 

 erate on tarsus IV, present but smaller on III. Dorsal humps absent on all 

 legs. Length of tarsus I, 0.60; metatarsus, 0.54. Length of tarsus IV, 0.78; 

 metatarsus, 0.66. 



Coxae. — Small, I and II separated, all others contiguous. Surfaces micro- 

 mammillated or granular. 



Hood. — Absent or negligible. 



Cheeks. — Large, reniform with the convex side attached and with the 

 anterior end free. 



Camerostome. — Well formed and together with the cheeks and the over- 

 hanging anterior projection of the dorsal body wall forming protection for the 

 mouth parts. 



Capitulum. — Basis capituli about as wide as long; surface irregular, micro- 

 mammillated or granulated. Palpi long, with article 1 very long, and with a 



