Pachyrhinus, Schonherr, 1823

Benzel, Joseph & Bright, Donald E., 2021, A revision of the genus Pachyrhinus Schӧnherr 1823 (Coleoptera: Curculionidae Entiminae) in the Nearctic Region, Zootaxa 4999 (6), pp. 501-533 : 531

Key to the Nearctic species of Pachyrhinus

1 Scales in mottled color pattern on elytral disc ( Figs. 11–12 ). Aedeagus highly arcuate with a tapered tip ( Figs. 75–77 ), spermatheca variable........................................................................................ 2

- Scales not in mottled pattern ( Fig. 10 ). Aedeagus feebly arcuate with a wide blunt tip ( Fig. 41–43 ), spermatheca C-shaped ( Fig. 44 ). Temperate North America................................................................... P. elegans

2 Scales 1.5X as long as wide, with blunt tips, teardrop shaped ( Fig. 8 ). Elongate interspersed scales on elytra bluntly tipped and recumbent to slightly appressed ( Fig. 97 ). Spermatheca comma-shaped ( Fig. 101 ). Western North America...... P. cinereus

- Scales 2.0 to 4.0X long as wide with tapered ends sometimes setose in form ( Fig. 7 ). Interspersed scales long, tightly appressed, elytral surface often setose ( Fig. 74 ), spermatheca C-shaped ( Fig. 78 ). California, Oregon, Washington and British Columbia .......................................................................................... P. californicus

Figures

FIGURES 10–15. Elytral Vestiture. 10. Pachyrhinus elegans. 11. Pachyrhinus californicus. 12. Pachyrhinus cinereus. 13. Pachyrhinus squamulosus. 14. Pachyrhinus lethierryi. 15. Polydrusus sericeus.

FIGURES 73–78. 73. Pachyrhinus californicus left elytron. 74. Stria. 75. Aedeagus, lateral view. 76. Dorsal view. 77. Ventral view. 78. Spermatheca.

FIGURES 39–44. Pachyrhinus elegans 39. Left elytron, dorsal view. 40. Stria and interstria. 41. Aedeagus, lateral view. 42. Aedeagus, ventral view. 43. Aedeagus, dorsal view. 44. Spermatheca.

FIGURES 6–9. Elytral Scales. 6. Pachyrhinus elegans. 7. Pachyrhinus californicus. 8. Pachyrhinus cinereus scale. 9. Polydrusus impressifrons Gyllenhall 1834.

FIGURES 96–101. 96. Pachyrhinus cinereus left elytron. 97. P. cinereus stria. 98. P. cinereus aedeagus lateral view. 99. Ventral view. 100. Dorsal view. 101. Spermatheca.