. Ectoparasites of the cottontail rabbit in Lee County, northern Illinois. Parasites. Fig. 2.—HaemaphysaUs leporis-patustris, continental rab- bit tick, unengorged adult female. This tick is a vector of tu- laremia. The characteristic of sharply pointed, lateral angles near the base of the mouthparts (one indicated by arrow) is distinctive of this tick in all stages. homa, Missouri, Iowa, Montana, and Minnesota, is not equally abundant on rabbits at all seasons, and, further- more, one or more of the stages are often rare to absent at certain seasons. Even in Florida the continental rabbit tic
. Ectoparasites of the cottontail rabbit in Lee County, northern Illinois. Parasites. Fig. 2.—HaemaphysaUs leporis-patustris, continental rab- bit tick, unengorged adult female. This tick is a vector of tu- laremia. The characteristic of sharply pointed, lateral angles near the base of the mouthparts (one indicated by arrow) is distinctive of this tick in all stages. homa, Missouri, Iowa, Montana, and Minnesota, is not equally abundant on rabbits at all seasons, and, further- more, one or more of the stages are often rare to absent at certain seasons. Even in Florida the continental rabbit tick is noticeably less abundant in winter (Ilixon in Eddy 1942). Apparently the more northerly the region the more markedly the populations of this tick fluctuate on rab- bits with the seasons. In Oklahoma (Eddy 1942) and in southern Missouri (Portman 1944), this tick occurs occasionally on rabbits even in midwinter. [3y contrast, in northern Missouri (Portman 1944), Iowa (Joyce & Eddy 1943), Montana (Cooley 1932), and Minnesota (Green et al. 1943), it becomes scarce on or entirely absent from rabbits during the coldest winter months. In Minnesota, Green et al. (1943) found that larvae of llaemaphysalis leporis-paiustris "suffer a relatively enormous loss as compared with the losses among older ticks, and that the total winter mortality can be ac- counted for largely on the basis of deaths of larval ; In Iowa, Joyce & Eddy (1943) reported an abrupt decrease to very few larvae on rabbits in November, an absence of larvae in December, and a low prevalence of larvae on rabbits in April, May, and June. Apparently in Iowa, as in Minnesota, many unfed larvae fail to survive the winter. Hooker el al. (1912) observed that under favorable conditions ticks in the larval stage could survive as longas258 days (about 8 months) without feeding. 'I'hey found, however, that most larvae survived for 2 to 7 months. In this study, we found that continental rabbit ticks cam
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