Pachybrachis, Chevrolat, 1836

Barney, Robert J., 2017, Definition and Revision of theLuridusSpecies-Group of North AmericanPachybrachisChevrolat (Coleoptera: Chrysomelidae: Cryptocephalinae), The Coleopterists Bulletin 71 (1), pp. 1-45 : 3-4

KEY TO MALES OF THE LURIDUS SPECIES- GROUP OF PACHYBRACHIS

1. Wholly or in great part black .................... 2

1′. Yellow or testaceous with black or brown markings .................................................... 5

2. Pronotum black, margined with yellowish white; face yellow with black median line extending down from vertex between eyes, forming distinctive paired, yellow, inverted triangular maculae; eyes widely separated (IOD = 0.32–0.43 mm); median lobe in en-face view with apicolateral margins (ALM) gently curved to rounded terminus; orificial space (OS) circular, basal plates sclerotized; beard with long setae visible from ALM to terminus; in lateral view, shaft inflated but truncated ( Fig. 7)............... ................ 7. P. confusus Bowditch (in part)

2′. Prothorax or elytra margined with red; eyes not widely separated (IOD = 0.13–0.30 mm); median lobe not as above...........................3

3. Elytra entirely black to mottled with yellowish white; pronotum with anterior median line and sides red or reddish yellow ( Figs. 5, 10A, D) .............. 5. P. luridus (Fabricius) (in part)

3′. Elytra orange-red with wide, black sutural stripe not reaching apex; pronotum white with broadly diffuse black M, varying to completely black with white margins; Florida ................................... P. discoideus Bowditch