The purpose of this study is to present an analysis and key to the larvae of the nine species of Ixodes known to occur in Utah. These are I. kingi, I. muris, I. texanus, I. pacificus, I. spinipalpis, I. marmotae, I. ochotonoe, I angustus, and I. sculptus. Larvae from the first five of these nine species used in this study were reared in the laboratory by worked cited in the secion on Analysis of Species. those of the remaining four were identified on the basis of their presence with identifiable numphal and adult forms. Host specificity, although certainly variable with some forms, also proved helpful in larval identification.