206 



Genus Ixodes 



Female (gorged, Fig. 198): Body elongate oval, may attain L. 10 mm., 

 W. 65 mm. toward the posterior third, brick-red in specimens of small 

 size, maroon-red in others. Scutum a short oval, scarcely longer than 

 broad (16 x 14 mm.), with lateral borders at first slightly convex and 

 diverging, then rectilinear and converging to the rather narrow posterior 

 angle ; emargination slight, cervical grooves well marked, reaching 

 almost to the lateral borders at their re-entering angles ; lateral grooves 

 well marked up to the lateral border, numerous fine punctations, 

 slightly unequal, rarer in the lateral fields; surface glossy, glabrous, 

 maroon-brown. Dorsum with sparse hairs (caducent) ; punctations very 

 superficial ; three posterior grooves. Venter with similar punctations 

 and hairs; vulva between coxae IV 1 ; anus fairly anterior; anal grooves 

 long, parallel, united in a flat curve in front of the anus. Spiracles 

 small, circular, whitish. Capitulum - 85 mm. long; dorsal base sub- 

 rectangular, much wider than long ; porose areas piriform, oblique, 

 converging anteriorly, placed near the lateral borders and separated by 

 a space equal to their width ; auriculae slight and blunt. (Chelicera 

 with digit 140/4 long ; dorsal process long, parallel to the shaft ; external 

 article with 5 teeth growing progressively larger antero-posteriorly.) 



Fig. 198. I. rubicundus ? : capitulum (mutilated) aud scutum, spiracle, tarsus 4, anal 

 groove, coxae and base of capitulum, ventral aspect. From a gorged ? from Ovis aries, 

 Neumann coll. 1253. (Original, G. H. F. N. del.) 



Hypostome long, narrow, sublanceolate, dentition 3 j 3, the internal file 

 short, of 6 or 7 teeth, the median almost as long as the external ; the 

 latter extending from apex to base, with 15-16 teeth. Palps long, 

 fairly slender, concave externally, second article longer than third- 

 Legs tapering, brick-red ; coxae I, II and III flat, unarmed, posterior 

 border trenchant ; coxae IV more swollen, with a small tuberosity on 

 the external third of the posterior border. Tarsi long, slender, tapering 

 gradually. 



1 In tbe specimen examined by us the vulva is placed just behind coxae III. 



