Rostrum terminal. Dorsal shield present. Sexual dimorphism marked |
Family Ixodidæ | Anal groove surrounding anus in front. | Prostriata Ixodinæ | Inornate, without eyes and without festoons. Spiracles round or oval. Palps of variable form. Tarsi without spurs. Sexual dimorphism pronounced. In the ♂ the venter is covered by non-salient plates; one pregenital, one median, one anal, two adanal, and two epimeral plates. Parasitic on Ungulata, carnivora, rodents, marsupials (kangaroo), bats, and birds. | 1. Genus Ixodes. | ||||
Anal groove containing anus behind. | Metastriata | (a) Brevirostrata. Rostrum short. Inornate, without eyes but with festoons. Usually with short conical palps, whose second articles project laterally. Small size and slightly chitinized. Sexual dimorphism slight. The ♂ shows no ventral plates or shields. |
2. Genus Hæmaphysalis. | ||||||
Usually ornate, with eyes and festoons. Short, broad, or moderate palps, and basis capituli rectangular dorsally. Spiracles sub-oval or comma-shaped. | 3. Genus Dermacentor. | ||||||||
Inornate, with eyes and festoons. Short palps, with basis capituli hexagonal dorsally with prominent lateral angles. The ♂ resembles Rhipicephalus dorsally, Dermacentor ventrally. Spiracles sub-triangular or comma-shaped. | 4. Genus Rhipicentor. | ||||||||
Usually inornate, with eyes and festoons. Short palps, and basis capituli usually hexagonal dorsally. The ♂ possesses a pair of adanal shields and usually a pair of accessory adanal shields. Spiracles bluntly or elongate comma-shaped. | 5. Genus. Rhipicephalus. | ||||||||
Inornate, with eyes, but indistinct festoons. Short palps, and capitulum intermediate between that of Rhipicephalus and Boophilus. Highly chitinized. The ♀ with very small scutum. The ♂ with a median plate prolonged into two spines projecting beyond and to either side of the anus. Anal groove obsolete. Spiracles rounded or short, oval in both sexes. | 6. Genus Margaropua. | ||||||||
Inornate, with eyes, but indistinct festoons. Very short compressed palps ridged dorsally and laterally. Basis capituli hexagonal dorsally. Slightly chitinized. Unfed adults of small size. The ♀ with small scutum. The ♂ with adanal and accessory adanal shields. Spiracles rounded or oval in both sexes. No anal groove. | 7. Genus Boophilus. | ||||||||
(b) Longirostrata. Rostrum long. Ornamentation absent or present, at times confined to the legs; with eyes, with or without festoons. Long palps. Basis capituli subtriangular dorsally. The ♀ approaching Amblyomma. The ♂ with a pair of adanal shields, and with or without accessory adanal shields, and two posterior abdominal protrusions capped by chitinized points. Spiracles comma-shaped. |
8. Genus Hyalomma. | ||||||||
Generally ornate, with eyes and with festoons. Long palps, of which the second article is especially long. Basis capituli of variable form. The ♂ without adanal shields, but small ventral plaques are occasionally present close to the festoons. Spiracles subtriangular or comma shaped. Sub-genus Aponomma. Devoid of eyes, or in which the eyes are poorly developed. Body frequently very broad. Occur almost exclusively on reptilia. |
9. Genus Amblyomma. | ||||||||
Rostrum concealed by overlapping cephalothorax. Dorsal shield absent. Sexual dimorphism slight. |
Family Argasidæ | Body usually flat with thin edges. Ventral grooves absent or very shallow. Eyes absent. | Genus Argas. | ||||||
Body with thick edges. Ventral grooves present. Eyes sometimes present. | Genus Ornithodoros. |
Page:Tropical Diseases.djvu/288
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