176 



Genus Ixodes 



Venter : vulva between coxae III ; genital grooves parallel at first, 

 curving outwards behind coxae IV, then nearly parallel but slightly 

 divergent to posterior border. Anal grooves ogival in front of anus. 

 Spiracle large, nearly circular, with eccentric macula. Capitulum: 

 (08 mm. I.), base pentagonal, about as broad as long ; cornua indistinct, 

 posterior border concave ; porose areas medium, slightly broader than 

 long, near posterior border, interval almost equal to their length. 

 Palps medium, article 2 half as long again as article 3, their convex 

 inner border somewhat beaded. Hypostome 2 1 2, about 6 teeth per 

 file. Legs long, coxa I with long slender internal spine and short 

 external spur ; a small external spur on coxae II-IV. Tarsi strongly 

 humped. 



Fig- 169. Pig. 170. 



Fig. 169. I. rubidus ? (type, unfed) : dorsum, part of venter, spiracle and tarsus 4. 



(Neumann, coll. 713. Original, G. H. F. N. del.) 

 Fig. 170. J. rubidus o (type, partly fed) : capitulum and scutum ; capitulum in ventral 



aspect with coxae, spiracle and tarsus 4. Same origin as ? previously figured. 



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



Nymph (Fig. 170): found in company with this ?, agrees with it 

 fairly well except that the scutum (06 x - 5 mm.) differs in shape; the 

 internal spur on coxa I is nearly absent and the basis capituli bears 

 auriculae. 



Our description is based upon the examination of one ? and of 

 one of three o s collected by A. Duges off Bassaris astuta at Guanajuato, 

 Mexico (Types, No. 713 in Neumann coll.). 



