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Ornilhodoros eremicus Cooley and Kohls 40 Ornilhodoros coriaceus Koch 42 Ornilhodoros hermsi Wheeler, Herms, and Meyer Ornilhodoros nicollei Mooser Ornilhodoros cooleyi Mclvor 52 Ornilhodoros luricuta (Duges) Ornilhodoros parf(eri Cooley 62 Ornilhodoros vumalensis Cooley and Kohls 74 Ornilhodoros brodvi Matheson Ornilhodoros talaje (Guerin-Meneville) Ornilhodoros concanensis Cooley and Kohls Ornilhodoros stageri Cooley and Kohls "I Ornilhodoros dveri Cooley and Kohls Ornilhodoros amblus Chamberhn Ornilhodoros rudis Karsch 101 Ornilhodoros dunni Matheson Ornilhodoros viguerasi Cooley and Kohls Ornilhodoros azteci Matheson Genus Antricola Cooley and Kohls Key to Species of Antricola Antricola coprophilus (Mcintosh) Antricola marginatum (Banks) Plates 1 to 14 Classified List of Hosts 141 Geographical Distribution of Species 144 Bibliography 146 Index be long or very short. Fig. 52 H. Camerostome: The depression or cavity in which the capitulum lies, and usually less definite in much engorged specimens. Capitulum : The movable anterior portion of the body including the mouth parts. The "head" or "false head" of some authors. Cheeks: Paired flaps at the sides of the camerostome, which may be either fixed or movable; the "movable cheeks" of some writers. Fig. 1, C. Chelicerae: Paired mouth parts for piercing the skin, lying dorsally on the hypostome and completing the more or less cylindrical mouth parts that are inserted when the tick feeds. CLUBBED Hairs: Hairs which do not taper and are terminally enlarged. Color: The color is greatly affected by ingested blood. At first there is a reddish tinge resulting from the fresh haemoglobin but in a few hours this changes to dark gray. During the subsequent process of depletion the changing color of the blood gradually loses its effect and only the natural color of the body wall remains. Color is much affected when the specimen is placed in preserving fluid; also those preserved soon after feeding appear different from those preserved after having been depleted for weeks or months. Thus, since the color is not dependable, it is usually not mentioned in describing the Argasidae. Corona: The apical portion of the hypostome which is differentiated from the remainder by having very small denticles which may be numerous or few in number. Coxae : The sequence of the coxae from anterior to posterior is indicated in Roman numerals thus, I, II, III, and IV. Fig. 1, B. ADULT Body.-Usually oval, wider behind; sometimes almost elliptical. Margins composed of irregular quadrangular plates or cells which often have one or more circular pits. In some specimens a very small, short, fine hair is visible arising frcm some of the pits. Like reflexus this species varies greatly in size. Nuttall et al. give size ranging from 4.0 x 2.5 to 12.7 long. Specimens in the collections of the Rocky Mountain Laboratory show sizes within the range published. Integument.-Surface of dorsum and venter with numerous rounded or sinuous, shining wrinkles. In some specimens the sinuous elevations are unusually lo...

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