The click beetle genus Limonius is revised for North America and forty-seven species are recognized: L. aeger LeConte, L. aurifer LeConte, L. auripilis (Say), L. basilaris (Say), L. beutenmuelleri Van Dyke, L. bicolor Van Dyke, L. californicus (Mannerheim), L. canus LeConte, L. clypeatus Motschulsky, L. confusus LeConte, L. consimilis Walker, L. cribriceps Van Dyke, L. crotchii Horn, L. definitus Ziegler, L. ectypus (Say), L. flavomarginatus Knull, L. fulvipilis Candeze, L. griseus (Beauvois), L. huguenini Van Dyke, L. humidus Lane, L. jonesi Lane, L. lanchesteri Lane, L. lanei Van Dyke, L. meridianus Knull, L. mirus LeConte, L. nebulosus Van Dyke, L. nimbatus (Say), L. nitidulus Horn, L. olentangyi Knull, L. ornatulus LeConte, L. pappi Becker, L. pectoralis LeConte, L. pictus Van Dyke, L. plebejus (Say), L. quercinus (Say), L. rectangularis Fall, L. sinuifrons Fall, L. stigma (Herbst), L. subauratus LeConte, L. ursinus Van Dyke, L. venablesi Wickham, two new species are described, L. kondratieffi n.sp., L. norahae n. sp., and nine new synonyms are recognized. Limonius insperatus Brown is designated as a synonym of L. aeger LeConte, L. dubitans LeConte is designated as a synonym of L. agonus (Say), L. shircki Lane and L. snakensis Lane are designated as synonyms of L. crotchii Horn, L. infuscatus Motschulsky is designated as a synonym of L. ectypus (Say), L. seminudus Van Dyke is designated as a synonym of L. fulvipilis Candeze, L. maculicollis Motschulsky is designated as a synonym of L. ornatulus LeConte, L. arizonicus Van Dyke is designated as a synonym of L. sinuifrons Fall, L. anceps LeConte is designated as a synonym of Limonius subauratus LeConte, and L. agonus (Say) is recognized as a valid species. Neotypes were designated for L. agonus and L. ectypus. Limonius debilis Dejean is considered a Nomen dubium.