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