28 IXODOIDEA, OR TICKS, OF THE UNITED STATES, 



Male. — Body very slender, more than twice as long as broad, dark 

 brown, and very hairy; a deeply impressed lateral and posterior 

 groove; surface densely punctate. Capitulum not broader behind 

 than long in middle, sides parallel, posterior angles not prolonged; 

 palpi short, but longer than width of capitulum, the third joint a 

 little longer than broad, legs rather short, coxaj I with a very long, 

 slender spine behind, II with two humps behind, and III with one 

 hump; venter punctate; stigmal plate (PL IV, fig. -t) twice as long 

 as broad, finely granulate. 



Length, 2 mm. 



A pair from Kerrville, Tex., May; one female from Sherwood, 

 Tex., on a prairie dog (F. C. Pratt), and two females from Walker 

 Pass, Death Valley, California, from Thomomys (Fisher). 



This species differs from Ixodes dioersifosstis by the shorter tarsi I, 

 by the absence of large pits on posterior part of the shield, by shorter 

 spine on coxa I, by shorter palpi, and has several minor differences. 

 Nymphs, probably of this species, are from Kerrville on skunk, and 

 from Del Rio on rock squirrel; the stigmal plate is elliptical, and of 

 peculiar sculpture, as figured (PI. IV, fig. 3). 



Ixodes dentatus Xeumann. (PI. IX, fig. 3.) 



Female. — Shield, capitulum, and legs dark red-broAvn; abdomen 

 nearly black. Capitulum (PI. IV, fig. C; PI. IX, fig. 3) small, hind 

 angles rather prominent; porose areas broader than long, nearly their 

 width apart; shield (PI. IV, fig. 6; PL IX, fig. 3) only a little longer 

 than broad, broad behind, lateral cariucB distinct, reaching the hind 

 margin, the middle area behind densely, finely punctate, elsewhere 

 with few punctures. Abdomen (engorged female) elongate, striate 

 and punctate, with many very short hairs; stigmal plate circular, its 

 surface minutely granulate, the stigma nearly central. The under 

 side of the rostrum shows a stout recurved tooth each side, just 

 behind the bases of palpi ( PL IV, fig. 6 ; PL IX, fig. 7) . Coxse I with 

 a long basal spine behind, and a small apical tubercle, and similar 

 one on coxse II, others unarmed (PL IV, fig. G) ; legs short, finely 

 haired. 



Length of female shield, 1 imn. 



Described from the type specimen in the Marx collection, taken 

 from a rabbit in Maryland; the palpi are broken off. This is the 

 only specimen I have seen; it is very distinct, not only by the teeth 

 on the rostrum, but also by the shape of the shield. 



Ixodes cookei Packard. (PL IX, fig. 4.) 



Female. — Shield yellow-brown, legs and palpi somewhat paler, 

 abdomen gray-brown. Capitulum (PL III, fig. 4; PL IX, fig. 4) 

 rather broad, triangular, the hind angles moderately prominent, the 



