The following new synonymies within the genus Loxandrus are proposed: L. parvicollis Casey, 1918 and L. concinnus Casey, 1918 with L. celeris (Dejean, 1828); L. crenulatus Chaudoir, 1868 with L. crenatus LeConte, 1852; L. calathinus LeConte, 1878 and L. cursitans Casey, 1918 with L. agilis (Dejean, 1828); L. suturalis Casey, 1918 with L. cervicalis Casey, 1918; L. comptus Casey, 1918, L. contumax Casey, 1918 and L. breviusculus Casey, 1924 with L. floridanus LeConte, 1878; L. aduncus Allen, 1972 with L. parvulus Chaudoir, 1868; L. minutus Allen, 1972 with L. pusillus LeConte, 1852; L. vitiosus Allen, 1972 with L. vulneratus Casey, 1918; L. fulgens Casey, 1918 with L. brevicollis (LeConte, 1848); L. ludovicianus Casey, 1918 with L. collucens Casey, 1918; L. limatus Casey, 1918 with L. rectus (Say, 1823); L. reflexus LeConte, 1878 and L. lateralis Casey, 1918 with L. saphyrinus (Chaudoir, 1843). Syntypes of Loxandrus accelerans Casey, 1918, L. collucens Casey, 1918, L. piceolus Chaudoir, 1868