Geographical variation in Pachybrachis nigricornis (Coleoptera: Chrysomelidae).
By Balsbaugh Jr, E.U. and W.L. Tucker.
JSTOR
Balsbaugh Jr, E.U. and W.L. Tucker. 1976. Geographical variation in
Pachybrachis nigricornis (Coleoptera: Chrysomelidae). The Coleopterists Bulletin 30(2): 117–131.