6 Family Argasidae 



The following species have been suppressed : 



americanus, chinche, mauritianus, miniatus, radiatus, sanchezi = 

 A. persicuB ; columbae, magnus, marginatus - A. reflexus (including 

 var. magnus) ; kochi = A. transgariepinus ; decussata, elliptica, fischeri, 

 inermis, longimana, pipistrellae, pulchella = A. Jvespertilionis ; strogu- 

 loides Gervais, 1844, p. 231, is a purely nominal species (Nn., 1896, 

 p. 25). A./orskali Audouin, 1827, p. 430, figured as a hexapod larva in 

 Savigny, 1826, PI. IX, Fig. 13 (1 and 2 g.) ; mentioned in Duges, 1834, 

 p. 32 ; called Hyalomma Forskaelii (Aud.) by C. L. Koch, 1844, p. 222 ; 

 possibly H. aegyptium according to Nn., 1896, p. 24, and 1901, p. 255. 



Explanation of terms and signs used in the following diagnoses. 



L. = the extreme length of the tick. 



W. = its width at the widest part. 



(I. and w. refer to length and width of various structures.) 

 Dorsum = the whole dorsal surface of the body. 



Mammillae = minute hemispherical or conical protuberances into which the 

 integument is generally raised. 



Discs=the foveolae, patellae, scutella, pits of other authors, see Figs. 6, 7, 23. 

 Venter = the whole ventral surface of the body. 



spiracle = the "peritreme" or "stigmal plate" of some authors. 



vulva = the genital orifice of the female. 



grooves = linear depressions. In Fig. 1 note pre-anal groove, post-anal groove 

 and post-anal median groove. 



folds = prominent integumental ridges. In Fig. 1 note supra-coxal and coxal 

 folds. 



camerostome = the cavity in which the capitulum lies. 



hood— the projection of the integument forming the walls of the camerostome. 

 Capitulum = the "rostrum," " head " or " false head " of various authors (Fig. 2). 



basis capituli or shortly 6ase = the basal ring, etc., of most authors. 



hypostome = the "maxilla," "radula," "labium," or " Unterkiefer " of various 

 authors. The dentition is indicated by figures on either side of a vertical 

 line. Thus 3 1 3 means three longitudinal files of teeth on each half of the 

 hypostome. 



chelicerae = thc "mandibles" or " pseudo-chelicerae " of some authors. The 

 terminology usually applied to the portions of the digit of the chelicerae 

 appears to us wrong and confusing, and we prefer to recognise (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. 



1. internal article = " median apophysis" or "immovable finger" of some 



authors. 

 dorsal process^" internal apophysis" of some authors. 



2. external article = " external apophysis" or "free" or "movable finger" of 



some authors. 



