16 IXODOIDEA^ OR TICKS, OF THE UNITED STATES, 



seen by the figures (PL I, figs. 3, 4). The joints appear somewhat 

 more roughened than in .1. viiniatus, and the tibia and metatarsus of 

 leg I are distinctly swollen below before the tip. There are fewer . 

 smooth spots on the dorsum of the body, and they are wider apart; 

 on the anterior part are three pairs of smooth spots, and a row each 

 side of them of four; outside of these roAvs the spots are irregular. 



The skin, is as densely Avrinkled as in A. miniatm. 



Length of swollen female, 5 to 7 mm. 



Three specimens from Tucson, Ariz. ; two were from a cavity in 

 Cereus giganteus, which was used, perhaps, by a bird. 



Argas refiexus Fabricius. 



This is the pigeon tick of Europe. I have not seen it from this 

 country, but Prof. H. Osborn, in Bulletin No. 5, of this office, page 

 25G, says : " It is common, I believe, as far north as St. Louis." Sev- 

 eral pigeon raisers have informed me that they do not know it, but 

 Thomas Wright, of Massachusetts, claims he has seen it in that State. 

 The species is more ovate in form than our A. 7niniatus, and the color 

 is grayer. , 



Genus ORNITHODOROS Koch. 



Body depressed, oval or elongate, sides subparallel, margin of 

 body rounded, not acute; palpi hidden under a median anterior 

 process. Skin usually with many irregular tubercles or granules. 

 Eyes sometimes present. 



Type. — O. savignyi Audouin. 



A few sj^ecies of this genus occur in all tropical countries, four of 

 them in the southern United States. Their bite is so very painful 

 that wherever they occur the inhabitants have given them common 

 names. Three of our species have received common names in Mexico. 



0. megnini is known as " garrapata," a term also applied to various 

 other ticks; O. turicata as " turicata," and O. talaje as " talaxi." Dr. 

 Jesus Aleman (quoted by Duges and Megnin) gives a long account 

 of the inflammation and disorders consequent to the bite of O. turi- 

 cata^ and Salle has written of the pain due to the bite of O. talaje. 



Our four species may be separated as follows : 



Table of the Species. 



1. Body provided with many short stiff bristles, hind tarsi scarcely three 



times as long as broad at base, with one subterminal hump above, 

 anterior tarsi also with one subterminal hump ; body rounded in 



front ; no eyes megnini. 



Body without bristles, but covered with rounded tubercles or granules; 

 hind tarsi more slender ,^,„_,,_,,,^ ^ 2 



