Generic characters. 1 Head Pnirontis stali 2 Head Pygolampis spurca 3 Pronotum lateral view Ocrioessa cornutulus 4 Pronotum lateral view Stenopoda guaranitica 5 Pronotum dorsal view Ocrioessa cornutulus 6 Scutellum lateral view Seridentus maculosus 7 Head and pronotum lateral view Seridentus maculosus 8 Pronotum lateral view Ctenotrachelus sp. (Ad pu: adpressed pubescence; Ap scu: apex of scutellum; Pr tu: pronotal tubercles; Sc exp: expansions of scapus; I: first labial segment; II: second labial segment; III: third labial segment).