Epimetopus costatus (LeConte), 1874

Perkins, Philip D., 2012, 3531, Zootaxa 3531, pp. 1-95 : 38-39

Epimetopus costatus (LeConte), 1874

Figs. 67 (habitus), 71 (aedeagus), 140 (map)

Sepidulum costatum LeConte, 1874: 48 .

Epimetopus costatus (LeConte) : Schwarz & Barber 1917: 132 (key).

Epimetopus costatus (LeConte) : Perkins 1979: 320 (lectotype design., desc., fig.). New collection record: USA: Texas, [no other locality data] (1 FMNH) .

Differential diagnosis. The habitus of E. costatus ( Fig. 67) is very similar to that of several other members of the Costatus group; reliable determinations will be based on examination of the aedeagus. The aedeagus ( Fig. 71) has a very distinctive median lobe, which is markedly widened at the distal one-third. It is nearest in form to the aedeagus of E. arizonicus ( Fig. 70), but that species has a much narrower and longer median lobe, which extends further beyond the slightly differently shaped parameres. Externally ( Figs. 66, 67), the two species differ in color, E. costatus is reddish and E. arizonicus is brown, and E. costatus has the non-carinate elytral intervals smoother.

Distribution. Currently known from Texas and Arkansas ( Fig. 140).