ee. With anal groove contouring anus behind, or groove faint or obsolete.
f. With short palpi ([fig. 149]).
g. Without eyes, inornate, with posterior marginal festoons; male without ventral plates. Numerous species. H. chordeilis and leporis-palustris from the United States. Hæmaphysalis Koch.
gg. With eyes.
h. Anal groove distinct; posterior marginal festoons present.
i. Base of the capitulum ([fig. 150c]) rectangular dorsally; usually ornate. Dermacentor Koch.
j. Adults with four longitudinal rows of large denticles on each half of hypostome; stigmal plate nearly circular, without dorso-lateral prolongation, goblets very large, attaining 43µ to 115µ in diameter; not over 40 per plate, each plate surrounded by an elevated row of regularly arranged supporting cells; white rust wanting; base of capitulum distinctly broader than long, its postero-lateral angles prolonged slightly, if at all; coxæ T with short spurs; trochanter I with small dorso-terminal blade. Texas, Arizona, etc. D. nitens
jj. Adults with three longitudinal rows of large denticles on each half of hypostome; goblet cells always more than 40 per plate; whitish rust usually present.
k. Dorso-lateral prolongation of stigmal plate small or absent; plates of the adults distinctly longer than broad; goblet cells large, usually 30µ to 85µ in diameter, appearing as very coarse punctations on untreated specimens, but on specimens treated with caustic potash they appear very distinct in outline; base of capitulum distinctly (usually about twice) broader than long, the postero-lateral angles distinctly produced caudad; spurs of coxæ I long, lateral spur slightly longer than median; trochanter I with dorso-terminal spur. D. albipictus, (= variegatus), salmoni, nigrolineatus.
kk. Dorso-lateral prolongation of stigmal plate distinct.