212 



Genus Ixodes 



Female (Figs. 206, 207) : unfed, 21 mm. I., may attain 8x5 mm. 

 Scutum : 1 x 09 to 1*1 x 1 mm., cordiform, scarcely longer than broad, 

 broadest much in front of the middle, postero-lateral borders straight 

 or somewhat concave ; cervical grooves shallow, wavy, reaching the 



Fig. 20G. Fig. 207. 



Fig. 206. I. canituga ? : capitulum and scutum ; capitulum in ventral aspect. Found 



on dog, Tynron, Scotland, by J. McMonnies, vn. 1908. (N. 447. Original, 



G. H. F. N. and E. W. del.) 

 Fig. 207. I. canisuga ? (replete) : venter, spiracle, tarsus 4. Same specimen as in 



Fig. 206. (Original, G. H. F. N. del.) 



posterior border, lateral grooves short, the ridge external to them 

 terminating just beyond the lateral angles; punctations large and 

 confluent in the lateral fields, giving a rugose effect, moderate and more 

 discrete in the median field ; emargination moderate ; scapular angles 

 blunt. Dorsum only slightly punctate, with very short, white hairs. 

 Venter : vulva facing the second intercoxal space ; genital grooves nearly 

 parallel at first, then separating, and terminating parallel to one another. 

 Anal grooves rounded or slightly ogival in front (often discontinuous), 

 with parallel sides. Spiracle sub-circular, but with major axis transverse. 

 Capitulum : base rectangular dorsally, twice as broad as long ; no 

 coruua; slight auricular ridges ventrally ; porose areas large, deep, oval, 

 the interval less than their diameter. Palps short, broad, article 2 about 

 equal in length to article 3 (asymmetry in Fig. 206). Hypostome 2 | 2, 



