56 



Genus Omithodoros 



faces of articles 1, 2, 3 ; hypostome spatulate, emarginate at the tip, 

 extending as far as the middle of article 3 of the palp; a corona followed 

 by a few large teeth, 2 | 2, about 3 teeth per file, then a few squamous 

 teeth ; only the distal third toothed. Legs (Figs. 58 (p. 40) and 83) 

 longer and thinner than in 0. savignyi ; coxae I and II separated, II — 

 IV contiguous, diminishing posteriorly. Tarsi as in Fig. 58. Closely 

 allied to 0. savignyi. 



83. 



Fig. 84. 



Fig. 



Fig. 83. 0. coriaceus $ . Living specimen, lateral aspect (same specimen as in fig. 81), 

 shows size and position of eyes and spiracles. Original, N. and W. 1 



Fig. 84. 0. coriaceus <? , x 8. Venter. (The eyes are hidden by the legs, see fig. 1, p. 7.) 

 Original, N. and W. 



C. L. Koch (1844 and 1847) describes this species as follows : " Shaped 

 like the sole of a shoe, thick margined, roughly shagreened, yellowish 

 earthy colour, spotted rusty red, legs toothed dorsally. Length 93 mm. 

 Body about twice as long as wide, width fairly uniform, indented on the 

 sides, pointed above the mouthparts, rounded posteriorly, a thick turned 

 up border all around 2 ; the whole surface, above and below, thickly 

 granulated like fish skin (shagreen), the granules flat above, consequently, 

 the whole leathery ; on the back unequal folds and grooves. Beneath 

 in the front of the body a deep groove running to the stigmata and on 

 the inner protrusion the rather large round quite clearly marked eyes. The 

 coxae gradually thicken towards the distal extremity and are somewhat 

 bent; the other articles somewhat compressed and clearly notched or 



1 This figure was drawn several days after feeding and the body has shrunk somewhat, 

 especially in front. Immediately after feeding the body, viewed in profile, appears much 

 more rounded behind, and the anterior margin is almost obliterated. 



5 This applies to an unfed specimen. 



