Aulexis nigricollis is a species of beetle in the leaf beetle family (Chrysomelidae), native to Borneo (Sarawak). The scientific name of the species was published in 1863 by Joseph Sugar Baly.
Elongate, parallel, rufo-fuscous, subnitidous, covered with long silky subdepressed fulvous hairs; thorax and upper portion of head black, sides of the former armed with three acute teeth; antennae and legs fulvous.