18 IXODOIDEA, OR TICKS, OF THE UNITED STATES. 



Ornithodoros turicata Duges. 



Color light brown, legs paler. Body broadly rounded in front and 

 behind, only slightly constricted behind leg III, the sides being nearly 

 parallel. Surface of body (PI. I, fig. 13) covered with many small 

 subequal, subconical granules. Impressions on dorsum small and in- 

 distinct, usually a curved one in front, subparallel to anterior mar- 

 gin, and some in pairs behind; on venter is a distinct median groove 

 behind from anus, a curved transverse one half-way from anus to tij:), 

 and subcoxal ones extending obli(iuely outward behind hind coxa'. 

 No eyes. Palpi (PL I, fig. 14) rather slender; legs (PL I, figs. 15, 16) 

 moderately long, the hind legs about as long as width of body. Tibia', 

 metatarsi, and tarsi I, II, and III with three tubercles above on each, 

 those on the tarsi most distinct ; hind legs without any definite tuber- 

 cles, the tarsi being very slender; all legs with a few scattered hairs; 

 all tibia? and metatarsi more than twice as long as broad. 



Length of swollen female, 6 to 7 mm, 



I have seen specimens of this species from Keene, Kissimmee, and 

 Crescent City, Fla. (in gopher holes) ; Burnet and Brownwood, Tex.; 

 Las Cruces, N. Mex. ; Phoenix, Ariz, (on cattle), and San Diego, Cal. 

 (on cattle). 



The first description of this species was by Duges, in 187G, in the 

 newspaper El Repertorio del Guanajuato, and later (1883) in La 

 Naturaleza. Megnin, in 1885, gave a fuller description with figures, 

 based on specimens sent him by Duges. One of his figures shows the 

 hind tarsi with a subterminal hump, not found in my specimens. In 

 the National collection is a vial from Doctor Duges labeled "6^. turi- 

 cata^ cotype." In this vial are 10 specimens, 7 of 6^. niegnini and 3 of 

 O. turicata as I have identified it, Avithout a hump on the hind tarsus. 

 I therefore suspect that Megnin incorrectly delineated this appendage. 



This species was taken from hogs in Mexico, and also in Texas, and, 

 like the other species, will attack man. 



Ornithodoros coriaceus Koch. 



Color dark brown to black, legs paler. Anterior margin of the body 

 rather cone-shaped in middle, broadly rounded behind, sides sub- 

 parallel, only slightly constricted behind legs III. The body is cov- 

 ered by small, rather elongate granules, usually of a yelloAvish color, 

 in striking contrast to the dark skin; venter with granules on the 

 posterior part, less distinct in front. There are some fine hairs, at 

 least near the margin of body. On the dorsum are several depressed 

 areas where the granules are few or absent. Venter with a median 

 groove from anus behind, and from in front of anus one extends 

 obliquely down on the sides. Behind leg I is a smooth rounded spot 

 or eye, and behind leg II is another, rather smaller, eye. The rostrum 

 is usually depressed into a cavity, so as to be barely visible. The 



