242 Genus Ixodes 



40. IXODES ORNITHORHYNCHI Lucas, 1845. 



Figs. 236-238 (Fig. 236 original). 



Lit. and Icon. : Lucas, 1845, p. 58, PI. I, Figs. 3, 3 a, 3 b, ? dorsum and venter. 

 Pagenstecher, 1861, p. 40, PI. II, Fig. 25, hypostome and digit (nymphs). 

 Neumann, 1899, pp. 142-144, Figs. 18, 19 (reproduced). 



Male : unknown. 



Female (Fig. 236, gorged) : Body long and narrow, with lateral 

 borders almost straight and parallel, attaining 7x4 mm., body, capitu- 

 lum and legs earthy yellow. Scutum considerably shorter than broad 

 (1*2x1*9 mm.), only slightly emarginate ; antero- and postero-lateral 

 borders very divergent, slightly convex, posterior angle very broad and 

 rounded ; cervical grooves shallow, divergent, broad, disappearing an- 

 teriorly; very many very fine equal punctations; no lateral grooves. 

 Integument very finely wrinkled, covered by fine short hairs. Dorsum : 

 a complete marginal groove only visible in the unfed tick close to the 

 border (Fig. 236). Venter : vulva narrow, facing the second intercoxal 

 space; sexual grooves very long, sinuous, only slightly divergent, 

 attaining the posterior border; anus situated far behind, anal grooves 

 slightly or not divergent. Spiracles large, almost circular, milky white. 

 Capitulum short, with pentagonal or subtriangular base at least twice 

 as broad as long; porose areas very large, rounded. (Digit, see Fig. 238 C.) 

 Hypostome (Fig. 238 H) short, bearing 3 1 3 files of 7-8 teeth. Palps 

 thick, with base distant from the hypostome ; article 2 about twice as 

 long as 3. Legs long, grouped in the anterior third of the body in 

 gorged specimens. Coxae elongate, unarmed, punctate, flat, trenchant 

 at the posterior border; legs long, relatively narrow, haired. Tarsus 

 1 (Fig. 237) thrice as long as broad, cylindrical, slightly humped near 

 the tip, with obsolete pseudo-articulation ; tarsus 4 four times as long 

 as broad ; the basal pseudo-article broader than the distal, which tapers 

 dorsally. Claws short, pad two-thirds the length of the claws. 



Nymph {Ixodes ornithorhynchi Pagenstecher) : resembles $ . Body 

 relatively broader (3 x 1*5 mm.), oval, the colour varying from brownish 

 yellow to earthy yellow. Capitulum with base relatively shorter and 

 broader, without porose areas. Digit 85 //. long, as in $. Hypostome 

 with 2 | 2 files of 5 teeth. 



Neumann was the first to describe the species adequately from 

 (a) six $8, from the Paris Museum, of which five were from the 

 Ornithorhynchus(Luca& coll.),and one from the Marianne Islands, collected 





