CERATIXODES PUTUS 595 



First article of palp not prolonged. Scutum pubescent with numerous 

 fine punctations. Pre-genital plate one-third longer than broad. Hypos- 

 tome with six to eight rows of marginal teeth united by crenulations. 

 Length 2'5 mm. ; width 1'5 mm. (Neumann) 



Female- (fig. 2.) Scutum longer than broad ; cervical grooves super- 

 ficial ; lateral grooves short. Basis capituli with slight hump behind 

 each palp. Porose areas large and pyriform in shape. Hypostome 

 lanceolate, with six rows of teeth. Length 3'5 to 10 mm. ; width 3*75 

 to 7 mm. (Neumann) 



This species is found throughout Europe ; it also occurs in Asia 

 Minor, Japan, China, Caucasus, Algeria, Madeira and the United States. 

 It has been found on a large number of different animals and on man. 

 In Europe it is said to transmit Piroplasma bigeminum. 



Ixodes angustus, Neumann. Male. (Plate LXXVI, fig. 3.) Anal 

 groove with slightly divergent posterior arms. Coxa I bidentate, internal 

 spur well developed, external small ; there are small spurs on the remain- 

 ing coxae. Tarsi moderately long; tarus IV tapering obliquely. First 

 segment of palp not prolonged. Scutum convex with many fine puncta- 

 tions. Hypostome small with three rows of sub-equal teeth. 



Female, (fig. 4.) Anal groove with slightly divergent posterior arms. 

 Coxa I with two short flat spurs, remaining coxae with similar external 

 spurs. Tarsi long and tapering, and without dorsal humps. First 

 segment of palp not prolonged. Basis capituli smooth on ventral surface ; 

 porose areas large and sub-triangular. Scutum longer than broad, sub-oval. 

 Cervical grooves superficial, lateral grooves marked with numerous 

 unequal punctations. Hypostome straight, with four rows of teeth. 



Ixodes angustus is found in the United States, Canada and the Argen- 

 tine Republic ; it is common on the squirrel, Sciurus httdsonitis douglasi. 



SUB-GENUS CERATIXODES, NEUMANN. 



Palps convex on their internal surfaces, third segment conical in the 

 male ; the fourth in the male is inserted near the proximal end of the 

 third, while in the female it is inserted near the distal extremity. 

 (Neumann) 



Ceratixodes putus, Cambridge. Male- (Plate LXXVI, fig. 6.) Anal 

 groove with parallel arms ; coxae without spurs. First segment of palp 

 not prolonged. Scutum glabrous with straight marginal fold ; cervical 

 grooves long and rather deep, punctations numerous. Posterior marginal 

 fold divided into five festoons, bordered with long hairs, the external 



