Natural history observations are presented for 15 species of leaf-mining chrysomelid beetles, including previously unrecorded details of mine characteristics as well as oviposition and feeding habits of adults. New larval host records include Ceanothus velutinus Douglas ex Hook. (Rhamnaceae) for Baliosus californicus (Horn); Betula lenta L. (Betulaceae), Castanea dentata (Marshall) Borkh., and Quercus velutina Lam. (Fagaceae) for Baliosus nervosus (Panzer); Abutilon Mill. (Malvaceae) for Stenopodius texanus Schaeffer; Ambrosia artemisiifolia L. (Asteraceae) for Sumitrosis inaequalis (Weber); Celastrus orbiculatus Thunb. (Celastraceae) for Sumitrosis rosea (Weber); and Fallopia scandens (L.) Holub (Polygonaceae) for Mantura floridana Crotch.