/. pratti and rubidus 175 



two humps behind, and III with one hump; venter punctate ; stigmal 

 plate twice as long as broad, finely granulate." 



Female (Fig. 168): Scutum 12 x 11 mm., but slightly longer 

 than broad, somewhat narrowly rounded behind, cervical grooves shallow, 

 extending rather more than half the length of the scutum, lateral 

 grooves bounded externally by a prominent dark ridge with a few fine 

 punctations; the area beween this ridge and the cervical groove is 

 strongly pitted with rather large, more or less confluent punctations ; 

 fine, discrete punctations over the rest of the scutum. Capitulum : 

 base broader than long, with slightly convex sides and fairly strong 

 cornua slightly curving inwards ; porose areas piriform, the broader end 

 internal, interval moderate, no auriculae 1 . Palps rather short and 

 broad, article 1 strongly prominent ventrally. Hypostome strong, well 

 covered with 2 [ 2 files of strong teeth, with no median unarmed area. 

 Venter: vulva facing the second intercoxal space ; anal grooves rounded 

 in front, diverging behind ; spiracle rather small, nearly circular. Legs : 

 coxa I with rather strong internal spur and a slight external spur ; a 

 faint indication of an external spur on coxae II-IV. Tarsus 4 tapering 

 abruptly. 



We have not seen the J 1 of this species, and therefore quote the 

 description given by Banks. The description of the $ is from a 

 specimen (N. 716) presented to us by the U.S. Department of Agri- 

 culture, Washington, D.C., and taken in Death Valley, California 

 (? host). Banks records it from Kerrville, Texas ; Sherwood, Texas 

 (on a prairie dog) ; and from Thomomys (a rodent) in Death Valley, 

 California. 



13. IXODES RUBIDUS Neumann, 1901. 



Figs. 169 and 170 (original). 

 Lit. : Neumann, 1901, p. 282 (no figure). 



Male : unknown. 



Female (Fig. 169; unfed): Scutum 14 x 1*3 mm., ovate, broadest 



at anterior third, glossy, hairless, convex, with lateral borders folded 



down, closely punctate and irregularly pitted ; the punctations larger 



and more confluent in front, discrete and uniform behind. Cervical 



grooves long, reaching the posterior border, gradually diverging ; no 



lateral grooves. Scapulae prominent. Dorsum with deep marginal 



grooves, ending where the genital grooves turn over the posterior border 



of the body ; well-marked furrows in continuation of cervical grooves. 



1 The presence of large auriculae is indicated in Banks' figure, which is very inaccurate. 

 We have not included the s in our key, Banks' description being insufficient. 



