Pachybrachis, CHEVROLAT, CHEVROLAT

Barney, Robert J., 2024, Redescriptions and Figures of the Pachybrachis Chevrolat (Coleoptera: Chrysomelidae: Cryptocephalinae) of Arizona, Including New State Records, Plant Associations, and Description of a New Species: The Tibial Spur Species, The Coleopterists Bulletin 78 (1), pp. 61-68 : 62

KEY TO MALES OF THE TIBIAL SPUR GROUP OF ARIZONA PACHYBRACHIS

1. Eyes moderately separated, IOD = 0.23– 0.27 mm ( Fig. 1 ) ...... 1. P. coronado Barney , new species

1′. Eyes very narrowly separated, IOD = 0.06– 0.12 mm ..................................................... 2

2. Aedeagal median lobe narrowed at base before rounded keel, POL extended and triangular ( Fig. 2 ) .............. 2. P. texanus Bowditch

2′. Aedeagal median lobe not narrowed at base, with obvious rear-facing projection, POL rounded and scoop-like ( Fig. 3 ) .................... ........................................ 3. P. uncinatus Fall

Figures

Fig. 1. Pachybrachis coronado, new species, Santa Cruz County, Arizona, holotype. A) Dorsal habitus, B) Lateral habitus, C) Face, D) Pygidium, E) Median lobe of aedeagus, lateral view, F) Median lobe of aedeagus, en-face view.

Fig. 2. Pachybrachis texanus, Brownsville, Texas, lectotype. A) Dorsal habitus, B) Lateral habitus, C) Face, D) Pygidium, E) Median lobe of aedeagus, lateral view, F) Median lobe of aedeagus, en-face view.

Fig. 3. Pachybrachis uncinatus, Arizona, lectotype. A) Dorsal habitus, B) Lateral habitus, C) Face, D) Pygidium, E) Median lobe of aedeagus, lateral view, F) Median lobe of aedeagus, en-face view.