. Cattle ticks (Ixodoidea) of the United States. Ixodidae; Ticks. 408 BUREAU OF ANIMAL INDUSTRY. The Spinose Ear Tick (Ornithodoros Megnini)? (Figures 65-67, 82-108.) Specific diagnosis.—Ornithodoros: Adult.—Body phial-shaped; sHghtly attenu- ated anteriorly, broadest at legs II, slightly constricted near legs IV, broadly rounded posteriorly; color brown to violet or black. On the surface, symmetrical depressions, one arciform, longitudinal, from each side of the projection corre- sponding to the capitulum; lateral and slightly anterior of this, an infundibuliform depression; in back, along th
. Cattle ticks (Ixodoidea) of the United States. Ixodidae; Ticks. 408 BUREAU OF ANIMAL INDUSTRY. The Spinose Ear Tick (Ornithodoros Megnini)? (Figures 65-67, 82-108.) Specific diagnosis.—Ornithodoros: Adult.—Body phial-shaped; sHghtly attenu- ated anteriorly, broadest at legs II, slightly constricted near legs IV, broadly rounded posteriorly; color brown to violet or black. On the surface, symmetrical depressions, one arciform, longitudinal, from each side of the projection corre- sponding to the capitulum; lateral and slightly anterior of this, an infundibuliform depression; in back, along the lateral border, a longitudinal groove of variable length, sometimes interrupted; a median groove occupying the greater length of the posterior half. Ventral surface: Preanal groove absent, replaced by a first postanal groove at a tangent to the anal slit, straight and joining the coxal groove; the true postanal groove near posterior border; a broad anal groove terminating at this postanal groove. Subcoxal and coxal folds broad, well marked, the latter not passing coxae II, and the coxal groove passing between coxae I and II, extending backward to the second post- anal groove and disappearing on the sides near the posterior angle of the body. Stigmata circular, 250 jii in diameter, stigmal pore semilunar. Anal valve broader than long (150 to 200 ju by 200 to 250 ju), each lip provided with short hairs. Eyes absent. Tegument slightly rough (shagreened), forming an irregular mosaic, strewn with numerous fine, short hairs. Reticulate fossettes occupy the ventral and dorsal depressions; others scattered here and there. On the ventral surface between the two postanal grooves, extremely small and hard spines. Capitulum very small and short; 150 ju from base of palpi to extremity of hypostome. Maxillae slender, 490 m long, digit 75 m, stalk slightly and insensibly swollen proximally. Internal apophysis of digit thick, provided with four teeth, two terminal nearly perpendicular to
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherwashi, bookyear1902
