468 



BUREAU OF ANIMAL INDUSTRY. 



Scutum covering the entire dorsal surface, except a narrow margin, lighter and ele- 

 vated in a swelling; pierced all over with punctiform depressions, in the center of 

 each of which a very short hair is inserted. The genital pore opposite the interc^oxal • 

 space between coxre II and III. Pregenital shield a little broader than long, nar-^ 

 rowed posteriorly into a narrow base, rectangular, anteriorly very much widened 

 and sinuous. Anal shield ogival, sides slightly divergent, almost twice as long as 

 broad. Epimeral shields reinforced laterally by chitinous plates," toward the median 

 line by punctations of the same kind bearing hairs. The entire ventral surface pro- 

 vided with fine hairs. Anus like that of the female. Capitulum 520 jn long (from 

 its dorsal border to the tip of the hypostome), at the base almost twice as broad as 

 long on its dorsal surface, which is almost rectangular, a little longer than broad on 

 its ventral surface, which is also almost rectangular. Mandibles with digit 165 // 

 long; sheath and denticles of mandibles as in male Ixodes ricinus. Hypostome 

 and palpi like those of male Ixodes ricinus, except that the lateral denticles of the 

 former are half as strong, the ventral crenulations more marked, each formed by 

 three denticles united at the extremities of their base. Legs like those of the female, 

 relatively longer and stronger, coxae nearly contiguous, the 

 retrograde spine of the first pair stronger, but a little less so 

 than that of the male of Ixodes ricinus. 



Female. — Like that of Ixodes ricinus, except for the fol- 

 lowing differences: Scutum less oval, more lozenge-shaped. 

 Fig. 229.— Tarsus IV of /. with lateral angles more pronounced, the sides a little exca- 

 hexagonus. X co^ After ^^leir posterior half, the posterior angle narrower; 



Neumann, from Railhet, , ^ ^. iT, ^ 



18'. 3, p. 710, fig. 485. punctations larger. In young specimens the dorsal surface 



has a marginal groove rather distant from the margin; this 

 presents posteriorly four small indentations formed by the prolonging of the ventral 

 grooves. Genital pore at height of last intercoxal space. Anus more anterior; ano- 

 marginal grooves longer, united in a point (ogival) anterior of the anus. Capitulum 

 shorter (700 ju); mandibles with digit 160// long; hypostome a little shorter, with lat- 

 eral denticles less salient, the median row very short, reduced to three. or four anterior 

 denticles; palpi shorter, the third article almost as long as the second. Legs rela- 

 tively shorter, thicker, especially the tarsi; coxae I with retrograde tooth less strong 

 shorter; tarsi thick, short, swollen toward the extremity, which is preceded by a 

 very salient gibbosity; pulvillum attains almost the middle of the length of the claws. 



As Neumann has all of our specimens of this form, we have taken 

 his diagnosis almost verbatim. This tick is reported both from the 

 United States and from Europe, and has been found on dogs, cattle, 



1890, pp. 481, 489, 498, 499, 500, Tav. xliii, fig. 2.— Batelli, 1891, pp. 78, 

 81, 98.— Railliet, 1893, pp. 709, 710, fig. 485.— Neumann, 1899a, pp. 109, 110, 

 111, 129-132, 156, 161, fig. 10.— Idem, 1899b, pp. 464-465.— Ward, 1900a, p. 

 204, fig. 1.— Idem, 1900b, p. 436, fig. 257.— Salmon & Stiles, 1901, pp. 467, 

 468, figs. 228-235. 



1815: Ixodes autumncdis Leach, 1815, p. 398; type host, Canis familiaris, England. — 

 Gervais & v^usr Beneden, 1859, p. 461. [See also Neumann, 1899, p. 129, as 

 syn. of /. hexagonus.'] 



1832: Ixodes erinacei Audouin, 1832, pp. 415-419, pi. xiv, fig. 2 a-u; type host, Erina- 

 cms.— Gervais, 1844, p. 242.— Hauler, 1882, pp. 310, 311.— Batelli, 1891, 

 p. 98. [See also Canestrini, 1890, p. 500, and Neumann, 1899, p. 129, as 

 syn. of I. hexagonus. — Murray, 1877, p. 190, renamed I. erinaceus.l 



1832: "J. reduvius Linnseus" of Audouin, 1832, p. 422, pi. xiv, fig. 4, [See also 

 Neumann, 1899, p. 129, as syn. of I. hexagonus.'] 



1837: Ixodes sexpunctatus Koch (1837), Heft 39, figs. 5, 6. — Idem, 1844, p. 233. — Idem, 



