236 Genus Ixodes 



as long as broad, tapering much behind, whitish. Capitulum short 

 (0 - 6 mm.), its base quadrangular, scarcely broader than long. (Digit, see 

 footnote 1 .) Hypostome (Fig. 230) short and broad, with some blunt 

 denticles in front, then 2 1 2 files of 5-6 blunt teeth. Palps as in $ but 

 shorter, scarcely twice as long as broad. Legs with coxae contiguous, 

 with spur slightly stouter than in $ ; legs thicker, with shorter articles, 

 more enlarged distally. 



Female (Fig. 231, unfed): Body flat, oval, yellowish, 3"2 x 17 

 mm., a complete marginal groove limiting a marginal fold of equal width 

 throughout. When fully gorged, the body is oval, broader behind, con- 

 tracted on a line with the spiracles, the largest specimen 15x11 mm., 

 and 9 mm. thick. Integument finely striated, with short hairs, few and 

 scattered. Scutum reddish yellow, almost oval, slightly longer (2'3 mm.) 

 than broad (2 mm.), flat in the median field, the sides convex ; cervical 

 grooves convergent, short and superficial ; lateral grooves clearly marked, 

 attaining the posterior border, accentuated by an external ridge ; 

 punctations very numerous, subequal, confluent in places. Dorsum : 

 grooves normal. Venter : vulva behind the level of coxae III (variable). 

 Sexual grooves very divergent, then curving toward each other at 

 the level of the anus, ending on the posterior border. Anus rather 

 posterior, in an elongate depression ; anal grooves parallel, then 

 convergent behind, where they unite in a point on the median line. 

 Spiracles very small, circular, reddish, placed toward the middle of the 

 length, distant from coxae IV. Capitulum long (1'3 mm.), reddish yellow ; 

 base short, pentagonal, broader than long, posterior border fairly straight, 

 lateral borders sub-parallel, then convergent in a cone anteriorly ; porose 

 areas deep, oval, elongate in the direction of the axis ; auricula forming 

 a retrograde horn. (Digit, see footnote 2 .) Hypostome (Fig. 231) long, 

 narrow, lanceolate, numerous small sharp teeth, followed by 3 | 3 files of 

 12-13 stout teeth, increasing 3 in size from within outward in each trans- 

 verse series, the median files far apart. Palps much longer than hypo- 

 stome ; article 1 thick, salient outward near the base ; article 2 at least 

 twice as long as 3, the whole palp cultriform, broadened dorsally, concave 



1 Digit 160 /t long; dorsal process (?) ; external article 4-toothed, the two anterior teeth 

 very small, the others strong. 



a Digit 210 /i long; dorsal process a longitudinal crescent, with retrograde teeth, 

 prolonged down to the lower third of the digit by its shaft of insertion ; external article 

 elongate, with five teeth of increasing size. 



3 Neumann states they diminish outwardly, but this does not agree with the figures 

 nor with our specimens. 



