Cooley & Kohls: Argasidae of N. America, etc. 123 



subparallel, apex pointed. Denticles apically 3 / 3 , then 2 / 2 , those of the mar- 

 ginal files largest; those of the median files very small and not easily seen even 

 when mounted in balsam. Length of hypostome, 0.12. 



HOSTS 



While A. coprophilus is known to be associated with bats, the species has 

 not been observed reeding on these animals. The junior author when at the 

 Picacho Mine tunnel in Arizona, having 'both living coprophilus and living 

 bats, attempted to feed the ticks on bats confined in a bag but was not success- 

 ful. While the ticks in all stages may be found in abundance on the bat guano, 

 they are at times numerous on the walls of the retreat. In one instance, a 

 female was found laying eggs in a crevice near where the bats were hanging. 



The type specimens were found in a carload of bat guano in October 1934, 

 originating at Linares (Nuevo Leon), Mexico, and held in quarantine at 

 Metamoros, Mexico; also in bat guano, May 29, 1931, at Tucson, Arizona, 

 by Dr. L. P. Wehrle. 



DISTRIBUTION 



In addition to the localities noted above, the species has been collected as 

 follows: 



Arizona. — 16083 and 16156, bat guano, September and October, 1939, 

 mine tunnel, Picacho Mountain, Pinal County, several hundred nymphs and 

 adults (Philip, 1940); 17863, 17866, locality as above, May 23, 1940, several 

 hundred nymphs and adults. 



Texas.— 17258, bat guano, September 14, 1940, Ney Cave, Hondo, Medi- 

 na County, several nymphs and adults; 17261, bat cave, September 16, 1940, 

 Concan, Uvalde County, numerous nymphs and adults. 



Mexico. — "Cueva de la Chepa" harboring numerous bats (Leptonycteris 

 nivalis and Pteronotus davyi julvus), near Tuxtla Gutierrez, Chipas, October, 

 1940 (Mazzotti, 1940) ; abandoned mine harboring numerous bats, 5 kilo- 

 meters west of Coquimatlan, Colima, November, 1940 (Mazzotti, 1941). 



Antricola marginatus (Banks), 1910 



Plate 14, Figs. 56 and 57 

 1910. Ornilhodorcs marginalus Banks, original description, p. 6, with figures. 



FEMALE 



Body.— Size 6.62 x 4.70. Banks (1910) gave the length as 5.0 to 8.0. 

 Color light tan. Shape in dorsal view sub-oval, widest at about the middle, 

 thence tapering to the anterior point which is 'bent ventrad; broadly rounded 

 posteriorly. Dorsal surface flattened or even depressed (f^d specimens would 

 probably show the surface about level with the margin). Margin with a con- 

 tinuous row of large tubercles which follows the entire periphery, each bearing 



