conclusion, satisfactory to myself, as to their generic position. 

 After much study of Dr. Marx's classificatory paper above men- 

 tioiTed, I conclude that the chances are most in favor of their ht- 

 longing to the genus .^l/X'JS, in whicli case they may perhaps be 

 the species described by Packard as Aroas aincricana, of which I 

 have no description. 1 am not at all sure of this generic conclu- 

 sion, however, as the figure of A. rcffiwus (the dove tick) in the 

 Standard Natural History shows the body produced anterit)rly 

 far over the head, and the palpi nearly twice as long as the ros- 

 trum. I therefore give the following description of the important 

 characters of this tick, which is made wholly from the specimens 

 above mentioned as taken in March, 1891, all of them being 

 secured from the ears of the same animal, a small bronco. This 

 animal had, shortly previous to that time, been brought in off the 

 range near the foot of the Organ Mountains. 



Description of adult. — Capitulum not apparent, minute, rudi- 

 mentary, concealed within a circular oval hollow or cavity with 

 raised edges, into which the mouth parts are sunken at base. This 

 oval hollow which contains the capitulum, is situated well below 

 the dorsal surface of the body, and at a considerable distance from 

 the anterior edge of the body. The palpi are not excavated longi- 

 tudinally on the inside, and are not approximated to the sides of 

 the rostrum, except of course at the base. They are but slightly 

 longer than the rostrum, 4-jointed, sub-cylindrical, a little more 

 than three times as long as wide ; the first three joints are nearly 

 ecjual, and cylindrical, while the fourth is hardly as long as the 

 third, not as stout, narrowing on a|)ex, and probably not retractile. 

 Rostrum can hardly be called either long or short, being about 

 twice as long as its width at base. Eyes absent. Anterior border 

 of body projected in a roundetl angle (not in a beak-like promi- 

 nence) immediately over the capitular hollow, the palpi and ros- 

 trum projecting forward sufficiently to be seen from above. Spir- 

 acle showing as a small round conical tubercle on side considerably 

 dorsal of last pair of legs, and just anterior to middle of lateral 

 constriction of body. 



The bod}' is coriaceous, leaden gray or bluish in color, with a 

 creamy colored area on ventral surface near base of abdomen, and 

 legs cream colored ; full round, oval in outline from above, about 

 half as thick as wide, and covered with little short spines which 

 give way on posterior half or more to hairs. A little behind the 

 middle the body is constricted at the sides. In alcoholic distended 

 specimens the dorsum has two short longitudinal depressions ante- 



