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Top
Row: Ixodes scapularis (dammini), the deer tick which
transmits Lyme disease. Left to right: nymph, adult male,
adult female, engorged adult female. Nymphs are most
common May through July. Adults appear in the fall and early
spring.
Bottom
Row: Dermacentor variabilis, the American dog tick,
which is not thought to transmit Lyme
disease. Left to right: adult male, adult female, engorged
adult female. Adults are most common in May, June, and July.
Note that the adult dog ticks are somewhat larger than adult
deer ticks, and have characteristic white markings on the dorsal
(top) side.
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