. Cattle ticks (Ixodoidea) of the United States. Ixodidae; Ticks. SEVENTEENTH ANNUAL REPORT. 407 Genus Ornithodoros ^ Koch, 1844. Generic diagnosis.—Argasidse: Body sometimes oval, lateral borders generally straight or almost straight and parallel, occasionally concave; anterior end more or less pointed, the sides diverging from here backward to the insertion of the II pair of legs; posterior end rounded. Hood recurved ven- trally, where it is hollowed out to form a so-called "camerostome" with thick edge. Margins of body thick, with undifferentiated tegument. Tegument mam- millated
. Cattle ticks (Ixodoidea) of the United States. Ixodidae; Ticks. SEVENTEENTH ANNUAL REPORT. 407 Genus Ornithodoros ^ Koch, 1844. Generic diagnosis.—Argasidse: Body sometimes oval, lateral borders generally straight or almost straight and parallel, occasionally concave; anterior end more or less pointed, the sides diverging from here backward to the insertion of the II pair of legs; posterior end rounded. Hood recurved ven- trally, where it is hollowed out to form a so-called "camerostome" with thick edge. Margins of body thick, with undifferentiated tegument. Tegument mam- millated with hemispherical elevations of various designs; on the dorsal surface variable depressions; on the ventral surface more or less constant folds and grooves; two paired longitudinal projecting folds (coxal folds) near median border of coxae, disappearing pos- terior of coxae IV; a pair of similar folds (supercoxal folds) above and lateral of coxae; one transverse preanal furrow; one transverse postanal fur- row; one longitudinal anal groove ex- tending from anus to postanal groove. Eyes present or absent. Type species.—0. Savignyi (Au- douin, 1827) Koch, Fig. 79.—Capitulum of larva of Argasminiatus. Ventral view. Greatly enlarged. Original. Neumann cites ten species for this genus. The best-known forms are— Ornithodoros Savignyi^ an African form which attacks man and animals and is alleged to produce quite serious effects. O. turicata^ an American form (South America, Mex- ico, southern United States) which attacks hogs and man, with alleged occasional fatal results. 0. Megnini. the spinose ear tick which attacks cattle, horses, asses, dogs, sheep, and man. Fig. 80.—Dor?al view of mandi- bles of same. Greatly enlarged. Original. ^Synonymy and Bibliogeaphy. 1844: Ornithodoros Koch, 1844, p. 219.—Idem, 1847, pp. 11-12.—FtiRSTENBERG, 1861, p. 208.—Canestrini, 1890, p. 531.—Idem, 1892, p. 582.—Trouessart, 1892, p. 47.—Neumann, 1896, pp. 3, 25-44.—Loun
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