IXODES COOKET PACKARD. 29 



porose areas about one-fourth broader than long, one-half their 

 diameter apart; palpi short and broad, the last joint barely, if any, 

 longer than broad, and plainly shorter than second joint. Shield 

 (PL III, fig. 8) only a trifle longer than broad, somewhat narrowed 

 behind, widest part plainly in front of the middle, its surface densely 

 and rather coarsely punctate, the lateral carinas moderately distinct, 

 running out slightly behind the widest part. Abdomen punctate and 

 with extremely short hairs ; in engorged specimens elongate ; the anal 

 furrows subjjarallel behind; the stigmal plate (PI. Ill, fig. 7; PI. IX, 

 fig. 4) large, elliptical, the surface granulate and the st4gma situated 

 before the middle ; coxae with a small apical tooth behind, and coxa I 

 (PL III, fig. 6) with a long stout spine at base; legs rather long and 

 large, tarsi suddenly narrowed before tip, tarsus I (PL III, fig. 5) 

 but little longer than the metatarsus. 



Length of female shield, 1.5 mm. 



Male. — Yellow-brown, the palpi very short, the apical joint fully 

 as long as second ; shield nearly one and two-thirds times longer than 

 broad, broadly rounded behind, rather densely and evenly punc- 

 tate, showing three shallow furrows, the median one not reaching as 

 far forward as the sublateral pair; stigmal plate large and like that 

 of the female ; the coxse armed the same, but the basal spine on coxa I 

 has a more slender point. 



Length of male, 3.3 mm. 



This species is common on small mammals in the Eastern States, as 

 far west as the Eockies. I have seen it from Norway, Me. ; Salem, Am- 

 herst, and Sherborne, Mass. ; Washington Hollow, Manlius, Albany, 

 Catskills, Crane Point, and Rensselaer and Greene counties, New 

 York; Pine County, New Jersey; Plummers Island, Maryland; 

 Washington, D. C. ; Agricultural College, Michigan ; Iowa ; St. An- 

 thony Park, Minn.; Brookings, S. Dak.; Denver, Colo.; Kansas; 

 Kerrville, Tex., and Guelph, Ontario, Canada. The known hosts in- 

 clude fox, mink, weasel, skunk, pocket gopher, striped gopher, porcu- 

 pine, woodchuck, raccoon, dog, cat, and robin. I have examined 

 Packard's type of this species, now in the Museum of Comparative 

 Zoology, and typical specimens of Ixodes hexagomis var. longispino- 

 sus of Neumann which are identical with Packard's form. I consider 

 Fitch's /. criiciarliis to be the same ; Fitch gave three descriptions of 

 this species — two from specimens from human beings, the other from 

 a specimen from mink ; they evidently apply to this species ; all were 

 from New York. In both cases on human beings the bite was very 

 severe, and medical attention was necessary in one case. 



Ixodes angustus Neumann. 



Female. — Shield pale brownish yellow ; legs very pale yellowish ; 

 abdomen yellowish gray. Capitulum (PL IV, fig. 2) small, triangu- 



