Cyphosterna Chevrolat, 1862

Figures 489–499. Cyphosterna atropurpureum (Chemsak and Noguera) comb. nov., dorsal and lateral images: 489–490) Male, 20.5 mm, La Paz, HND. Head: 491–493) Front vertical, subquadrate with a deep pit on each side above postclypeus (white arrow), genae subquadrate, prominent (red arrow), scape carinate (yellow arrow). Pronotum: 494) Disc moderately inflated, anterior half carinate in middle with callus on each side (yellow arrows), posterior half with an opaque, impunctate callus in middle and obliquely, elongate, coarsely punctate callus on each side (white arrows), sides tuberculate (red arrow) and laterally excavated above (green arrow). Thorax lateral image: 495) Pronotal disc with base behind lateral and median calli narrowly impressed (purple arrow), mesosternal process protuberant (blue arrow).Metatarsi:496) Metatarsomere 1 (T1) subequal (red brackets) to tarsomeres 2+3 (T2+3), T1/ T2+3: 1.0. Elytra dorsal and lateral images: 497) Apices obliquely sinuate truncate with outer angles obtusely dentate. 498–499) Each elytron with four prominent costae, a subsutural costa extending from base almost to apex (red arrow), submarginal costa starting behind humerus attaining apical 1/6 (blue arrow) with lateral branching costa starting on inside at apical 1/5 reaching basal ¼ (green arrow), and another costa between subsutural one and submarginal branch starting from basal 1/5 attaining apical 1/6 (yellow arrow).

Figures 478–488. Cyphosterna sinaloanum (Chemsak and Linsley) comb. nov., dorsal and lateral images: 478–479) Male, 22 mm, Chamela, Jalisco, MEX. 480–481) Female, 18 mm, Chamela, Jalisco, MEX. Head:482–484) Front subvertical, subquadrate, seamlessly fused with postclypeus, genae subquadrate, prominent (red arrow), scape carinate (yellow arrow). Pronotum: 485) Disc moderately inflated, excavated laterally (green arrow) and sides tuberculate (red arrow). Thorax lateral image:486) Pronotal disc with prominent dorsal callus, mesosternal process protuberant (blue arrow). Elytra: 487) Each elytron with prominent paired eburneous ridges, apices tapered, narrowly rounded (red arrows) with minute sutural spine (green arrow) and appressed silver pubescence (blue arrow). Metatarsi:488) Metatarsomeres narrow, elongate, tarsomere 1 (T1) longer (red brackets) than tarsomeres 2+3 (T2+3), T1/ T2+3: 1.2.

Figures 459–477. Cyphosterna quadrilineatum Chevrolat, dorsal and lateral image: 459–460) Male, 19 mm, 23 mi S Matias Romero, Oaxaca, MEX. 461–462) Female, 22 mm, 17 km N Ariaga, Chiapas, MEX. 463) Female, ventral image. 464) C. quadrilineatum syntype, Yucatan, MEX. (Bezark 2024, id: 6392). Head: 465–467) Front subvertical, subquadrate, seamlessly fused with postclypeus, genae subquadrate, prominent (red arrow). 467–468) Scape carinate (red arrow). Pronotum: 469, 471) Disc laterally excavated (green arrow) and sides tuberculate (red arrow). Thorax lateral images: 470, 472) Pronotal disc inflated with prominent dorsal callus, mesosternal process protuberant (red arrow). Elytra: 473–474) Each elytron with prominent paired eburneous ridges, apices emarginate (red arrows) with subsutural dentation (green arrow) and appressed silver pubescence (yellow arrow).475) Elytral apices of syntype (Bezark 2024, id: 6392). Metatarsi:476–477) Metatarsomeres narrow, elongate, tarsomere 1 (T1) longer (red brackets) than tarsomeres 2+3 (T2+3). 476) Male, T1/ T2+3: 1.4. 477) Female, T1/ T2+3: 1.3.