0. megnini 75 



the dorsal border, between coxae III and IV ; stigmal plates covered by 

 numerous hairs. Capitulum (Fig. 108) subterminal in first-stage nymphs, 

 inferior in later stage nymphs, elongate, base as long as palps ; about 

 375 fM long (from base of palps to tip of hypostome) ; chelicerae (see 

 Fig. 104 .4) ; hypostome lanceolate, dentition 4 | 4, with 7 to 9 teeth per 

 file ; palps thick (articles 1 to 4 measure 140, 125, 110, 180 fi) ; second 

 article 110 fi broad; simple hairs, not very numerous, on articles 2 — 4, 

 six to eight short terminal bristles; some short thick hairs, symmetrically 

 placed, on basis capituli. Legs long and strong ; coxae very short, but 

 broad, distant from median line, almost marginal ; other articles cylin- 

 drical, relatively short compared with their diameter ; terminal portion 

 of tarsi elongate, claws strong, pulvillum absent, hairs sparsely distri- 

 buted on all articles. Size : 3 to 4 mm. long, when unfed, to 8'5 mm., 

 when maturer and gorged, the latter 5'5 mm. wide (Neumann). 



The foregoing description of the adult is partly based on that of 

 Neumann (1896, pp. 43, 44), that of the nymph on the descriptions of 

 Neumann (ibid., pp. 42-43), and Salmon and Stiles (1901, pp. 409-410). 

 According to Hooker (1908, p. 40 et seq.) there is but one nymphal 

 stage. The full-sized nymphs we have seen conform to the adults in 

 general appearance but differ in having no sexual aperture and having 

 the hypostome armed as in Fig. 108. We have verified the descriptions 

 by the examination of specimens in our possession, and have added 

 matter of our own. 



Larva 1 (Figs. 109-110) : hexapod, elongate oval, with long terminal 

 capitulum, measuring 061 mm. from tip of hypostome to posterior ex- 

 tremity. Integument finely striated with symmetrically arranged pits, 

 from which bristle-like hairs issue. Capitulum : hypostome 2 | 2, almost 

 as long as palps; palps: articles 2 and 3 equal, 1 and 4 short; large pits 

 in inter-coxal spaces 1 and 2. Legs : pulvillum small (see Fig. 111). 



Gorged larvae attain 4x2 mm. (Salmon and Stiles' " pupa-like 

 stage," see Fig. 112); they appear as "rounded white pyriform struc- 

 tures with one end elongate," the "distended smooth hexapod skin 

 with terminal capitulum " contains the spinose nymph " with subter- 

 minal capitulum, and with well-developed claws on the tarsi, and four 

 rows of denticles on each half of the hypostome." (Condensed and 

 modified from Salmon and Stiles, 1901, pp. 410-411.) This is obviously 

 the stage which Townsend (1893, p. 49) interpreted as an egg. 



"This tick is remarkable for the difference in appearance between 



1 Also described by Stiles and Hassall, 1901. 



