128 



Terminology 



Chelicerae = the "mandibles" or " pseudo-chelicerae " of some authors, paired 

 structures lying dorsally to the hypostome. The terminology usually 

 applied to the portions of the digit of the chelicerae appears to us wrong 

 and confusing, and we prefer to recognize (1) an "internal article," the 

 latter bearing a " dorsal process " which is a portion of it (not articulated), 

 and (2) an " external article " which articulates with the internal article 

 upon its outer side : 

 Internal article — "median apophysis" or "immovable finger" of some authors. 



Dorsal process =" internal apophysis" of some authors. 

 External article = " external apophysis" or "free" or "movable finger" of 

 some authors. 



We attach little importance to the description of the chelicerae in routine 

 systematic work. 



1. 



■2. 



EXTERNAL ARTICLE';— ... 



DORSAL PROCESS. 



FLEXOR TENDON.- 

 EXTBNSOR TENDON 



EXTERNAL ARTICLE 



Fig. 136,1. 



INTERNAL ARTICLE. 



Fig. 136 B. 



THE DIGIT. 



Fig. 136 A. Distal extremity of chelicera in dorsal aspect, showing articulation of digit 

 and the two tendons (black) which move it laterally. B. Digit with articles 

 separated. Illustrating the structures referred to in the descriptions. Haemaphysalis 

 punctata ? . (Nuttall, Cooper and Robinson, 1908, Figs. 7 and 8.) 



Palps : articulating antero-laterally upon the basis capituli. Frequently cultri- 

 form so that when apposed they protect the hypostome and chelicerae. 

 In ticks possessing long palps four palpal articles can usually be made 

 out very distinctly. These are numbered 1 to 4, beginning with the basal 

 article. In some ticks some of the articles, especially articles 2 and 3, 



