478 



BUEEAU OF ANIMAL INDUSTEY. 



very evident, however, that the name americanus has been used to cover a number 

 of perfectly distinct species. In estabUshing the synonymy it is impossible in all cases 

 to recognize with certainty the species which a given author has had under considera- 

 tion, and in this event one is compelled to base his action largely upon the technical 

 name adopted by the author in question. 



Genus Hyalomma^ Koch, 1844. 



Generic diagnosis. — Eyes present, occasionally hemispherical, brilliant, in a sub- 

 marginal orbit of the scutum; or flat, scarcely salient. Capitulum long, palpi valvate. 

 Anal groove semicircular, opening forward, uniting the sexual grooves, and followed 

 by a median ano-marginal groove. Body elongate oval. Color more or less deep 

 brown. 



Male. — With two pairs of ventral shields: two adanal, triangular, large; two lateral 

 of these, smaller, straight; further, frequently two accessory shields posterior of the 

 adanal. Stigmata comma-shaped, tail long. Scutum festooned on posterior margin. 

 Tarsi calcarate. 



Female. — Stigmata triangular; posterior margin festooned before replete stage. 

 Type species. — Ilyalomma cvgypthim (Linn^us). 



Neumann recognizes three species of this genus, none of which 

 appear to have been collected in North America. 



Key to the Species of the Genus Hyalomma. 



1. Eyes salient; coxx I incised 2 



Eyes flat; cox se I not incised; scutum ivitli numerous equal punctations; median 



border of adanal shield longer than posterior border; only the male 

 known 11. crassiiarsus. 



2. Scutum with numerous unequal p)unciations; median border of adanal shield 



longer than posterior border II. segypiium. 



Scutum with few, equal 2')unctations; median border of adanal shield shorter 



than posterior border II. afflne. 



BIBI^IOGFcAPHY. 



Agassiz, Louis. 



1846. — Nomenclatoris zoologici Index Universalis, continens nomina systematici 

 classium, ordinum, familiarum et generum animalium omnium, tam 

 viventium quam fossilium secundum ordinem alphabeticum unicum 

 disposita adjectis liomonymiis plantarum, nec non variis adnotationibus 

 et emendationibus, pp. viii + 393, 4°, Soloduri. 



^ Synonymy and Bibliography. 



1844: Ilyalomma Koch, i844, pp. 220-223.— Idem, 1847, pp. 13-15.— FtiRSTENBERG, 

 1861, p. 208.— Murray, 1877, pp. 187, 196-198.— Canestrini & Fanzago, 

 1877, pp. 178, 186-188.— Canestrini, 1890, pp. 476, 479, 482, 484, 486, 487, 

 488, 489, 490, 491, 492, 506.— Idem, 1892, p. 581.— Marx, 1892, pp. 233, 235.— 

 Eailliet, 1893, pp. 710-712.— Trouessart, 1892, p. 47.— Neumann, 1897, p. 

 325.— Idem, 1899, pp. 107, 108, 168, 283-294.— Ward, 1900a, pp. 204, 205.— 

 Idem, 1900b, pp. 436, 437.— Morgan, 1899, p. 138.— Salmon & Stiles, 1901, 

 pp. 477, 478. 



1863: Ixodes {Hyalomma) Koch in Gerstaecker, 1863, p. 344. 



