170 Genus Ixodes 



brownish yellow between the cervical grooves ; the latter shallow, 

 attaining the posterior quarter; lateral grooves indicated by straight, 

 nearly parallel raised margins which limit external declivities ; puncta- 

 tions deep, equal, numerous, absent on the cervical grooves, and anterior 

 border. Dorsum almost glabrous, showing a trace of a marginal groove. 

 Venter with more numerous hairs. Vulva between coxae IV ; sexual 

 grooves but slightly curved, diverging little. Anus rather near the 

 posterior border; anal grooves parallel. Spiracles large, rounded, 

 whitish, situated about midway along the body-length. Capitulum 

 long (G"9 mm.) ; base almost as broad as long, pentagonal ; slight 

 cornua, the anterior border narrowed, porose areas small, far apart ; 

 auricula forming a horn-like protrusion. Hypostome narrow, pointed in 

 front, bearing 3 1 3 files of 13-14 teeth, decreasing inward in each 

 transverse row, the internal files much separated from each other, 

 especially behind. 1 Palps long, narrow, article 1 prolonged into a ventral 

 retrograde spine ; article 2 longer than 3. Legs long. Coxae bear 

 some long hairs ; a moderate protuberance at the postero-external 

 angle ; a long spine at the postero-internal angle of coxae I. Tarsi 

 long on pairs 1 and IV, of ordinary size on pairs II and III, with 

 almost parallel borders; the dorsal border abruptly tapering near the 

 extremity; pads large, as long as the claws. 



Nymph : Body short oval, L. 1*8, W. 1*5 mm., whitish. Scutum of 

 the same form as in $ ; cervical and lateral grooves clearly defined. 

 Capitulum 07 mm. long, similar to that of ? ; base broader in front 

 than behind ; no ventral spine on the first palpal article. Legs similar ; 

 the spine on coxa I shorter. 



Larva : short oval, L. 1 mm. Scutum broader than long. Capitulum 

 similar to that of o, hypostome less pointed; spine on coxa I shorter. 



Neumann described this species as Ixodes spinosus from 4 $s, 7 os 

 and 3 larvae collected by Goeldi in Brazil from Dasyprocta aguti. 

 Subsequent examination of Koch's type of I. fuscipes (1 $ from Brazil) 

 convinced him that the two species were identical. He has kindly lent 

 us a $ from Goeldi's collection, and the above description has been 

 altered in a few unimportant respects from that of Neumann of 

 the $ of /. spinosus as the result of our study of this specimen. 

 (Fig. 163). We have also examined an older $ in the British Museum, 

 attributed by Neumann, probably correctly, to the same species, but it 

 has a distinctly longer scutum (Fig. 164). This specimen was found on 

 Felis pardalis, at Panama (Watson coll.). 



1 The dentition of the hypostome shown in Fig. 163 differs from that here described ; 

 the structure is doubtless variable. 



