A. vespertilionis 



37 



Nymph (Figs. 50-52) : Body nearly circular, 2 - 4 x 2'1 mm. 

 (3-7 x 3-8 mm. to 495 x 4"37 mm. according to Wheler, 1899, p. 12, 

 ? 2nd stage nymph. We have examined large nymphs from the Cape, 

 measuring 5'5 mm. in length). Integument finely creased in zig-zags in 

 young individuals, in polygonal design in the more aged ; margin 

 (Fig. 53) with irregular folds in young individuals, quadrangular areas 



Fig. 52. Argas vespertilionis. Nymph's intestinal caeca. 

 After George, 1875, pi. II, fig. 2. 



Fig. 53. 



Fig. 54. 



Fig. 56. 



Argas vespertilionis. Nymph. 

 Fig. 53. Slightly schematic figure of part of ventral surface and margin, x 300. 

 Fig. 54. Capitulum, ventral aspect, x 65. 

 Fig. 55. Hypostome, x 585. 

 Fig. 56. Digit, x 665. 



(Neumann, 1896, figs. 23, 24, 25 a and b.) 



in others, radiating, having very short hairs ; numerous small slight 

 depressions dorsally and ventrally, arranged similarly to the discs in 

 A. persicus. Venter: spiracles reniform (34^. w.), less than half the 

 width of the anal ring (130 x 90 /*). Capitulum (Fig. 54) anterior, the 

 three distal articles of the palp together with the tips of the chelicerae 

 and hypostome visible dorsally (in younger nymphs) ; hypostome (Fig. 

 55) slightly indented, 2 1 2 rows of 5 or 6 teeth ; digit, see Fig. 56 ; 



