390 



BUREAU OF ANIMAL INDUSTRY. 



important character for classifying ticks. Thus, in the Texas fever 

 tick {BoojphUus annulatui)^ found in the United States, and in the cor- 

 responding tick {B. australis) found in Cuba, Porto Rico, certain parts 

 of South America, India, and Australia, there are eight rows — four 



Fig. 54.— Outline drawing of dorsal and ventral views of one-half of capitulum of male Boophilm^ 

 annulatus. Note the following parts: Base with p. I., posterior lateral projection; palpi, I, 3, U, 

 first, second, third, and fourth palpal articles; digit of mandibles; sheath of mandibles; four rows 

 of denticles on hypostome. The neck and front part of the body are also shown; scutum, with a. L, 

 antero-lateral projections, and a. m., antero-median projections; c, anterior projection of coxa I. 

 Greatly enlarged. Original. 



rows on each half. In BoopMlus decoloratus, of South Africa, there 

 are six rows — three rows on each half. Now and then a tick is met 

 with which varies slightly from the general rule, thus resulting in some 

 difficulty in determination. Quite recently, in a sending of ticks from 



Cuba, all the males corresponded with the 

 males of B. australis^ but one individual pre- 

 sented six rows of denticles instead of eight. 



(3) The mandibles (chelicerse, or jaws) are 

 two in number, representing a pair of elon- 

 gate structures (fig. 56), one of which is 

 situated on each side of the median line, both 

 lying dorsal (figs. 53-55) of the hypostome. 

 The}^ may be seen either in dorsal or in 

 ventral view of the capitulum, and occasion- 

 ally appear as if they were a part of the 

 hypostome, thus leading to confusion. A slight pressure, however, 

 usually separates them more distinctly from the hypostome. The 

 proximal half ov third is swollen to contain the muscular insertions. 

 The distal half oy two-thirds is flat and narrow and terminated anteri- 



FiG. 55.— Transverse section 

 through the mouth parts of Kya- 

 lomma xgyplium: p, palpi; m, 

 mandibles; h, hypostome with 

 denticles. After Neumann, 

 1892a, p. 93, fig. 54. 



