Pachybrachis chaoticus, Fall, 1915

Barney, Robert J., 2021, Definition and Revision of the cylindricus Species-Group of North American Pachybrachis Chevrolat (Coleoptera: Chrysomelidae: Cryptocephalinae), Including Descriptions of Six New Species, The Coleopterists Bulletin 75 (4), pp. 723-748 : 724

3. Pronotal punctures sparse;elytral striae completely irregular ( Fig. 3 ) .................. 3. P. CHAotICUS Fall

3′. Pronotal punctures dense in dark areas; elytral striae semi-regular ......................................... 4

Figures

Fig. 3. Pachybrachis chaoticus, 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, G) Median lobe of aedeagus, sub view.