Bayesian analysis of 164 sequences, 404–654 bp in length, of the mitochondrial gene COI with posterior probabilities and Garli maximum likelihood bootstrap values above each branch. Included are 9 Phlaeopterus ingroup species and 1 Unamis and 6 Lesteva outgroup species Topology is a Bayesian 50% majority rule consensus phylogram. One intermixed clade of the species P. castaneus + P. loganensis is indicated at (a), with (a’) indicating the subspecies P. castaneus castaneus and (a’’) indicating the subspecies P. castaneus cascadiensis. Taxon names in blue are species with maximum body sizes over 8 mm; names in red are species with maximum body sizes 6.5 to 7.9 mm with wide bodies; names in black are species with maximum body sizes below 5 mm; the name in green is for P. elongatus with a maximum body size of 6.4 mm, with an elongate body.