G. H. F. Nutt all 
137 
between 16 x 1‘2 and l - 4 x 1*2 mm. 1 , broadest at the anterior third, 
rounded laterally; cervical grooves shallow, divergent, and attaining 
the postero-lateral border, being more or less continuous with somewhat 
rugose depressed areas lying between the raised central field and the 
lateral ridges which accentuate the lateral grooves; postero-lateral 
borders slightly concave where the cervical grooves end, posterior 
margin rounded, moderately coarse punctations aggregated chiefly in 
the posterior part of the median field, finer punctations chiefly upon 
the lateral ridges, long fine caducent hairs retained chiefly upon the 
Fig. 4. Ixodes ricinoides n. sp. ? . Capitulum in dorsal and ventral aspects, coxae I-IV, 
anal groove, spiracle and tarsus 4. The hypostome to the right is drawn as it 
appeared when highly magnified. (N. Cunliffe, del.) 
antero-lateral borders and behind the emargination. Capitulum some¬ 
what triangular, about as broad as long, dorsal ridge slightly concave 
and terminating in small, trenchant cornua; sides converging anteriorly, 
rounded, or with slightly marked ridge; porose areas large, somewhat 
pear-shaped, forming flat, coarsely punctate depressions, the interval 
1 The scutum measured as follows in the 5 ? s: 
1. 1-6 x 1-2 mm. 4. 1'5 x 1-2 mm. 
2. 1-6 x 1-2 „ 5. 1-4 x 1-2 „ 
3. 1-5 x 1-2 „ 
Parasitology vi 
10 
