A review of the Geomydoecus texanus complex (Mallophaga: Trichodectidae) from Geomys and Pappogeomys (Rodentia: Geomyidae)

Geomydoecus texanus is redescribed and illustrated, with the nominate subspecies restricted to material from Geomys personatus. Five new species and subspecies of Geomydoecus are described: G. texanus tropicalis from Geomys tropicalis; G. ustulati ustulati from 5 subspecies of Pappogeomys castanops (type-host: P. c. ustulatus) ; G. u. clarkii from 2 subspecies of P. castanops (type-host : P. c. clarkii) ; G. tamaulipensis from P. c. tamaulipensis; G. subnubili from 9 subspecies of P. castanops (type-host: P. c. subnubilus). Distinctions between these taxa are shown using qualitative and quantitative characters, and principal components analysis of quantitative characters. A key is given for identifying these 6 taxa.