Diagnostic characters plate 2. A Tarsal claws bifid or appendiculate B Frons with deep transverse sulcus. C Head forming straight angle with respect to pronotum D Head strongly directed downward, forming 45º angle with respect to pronotum E Posterior margin of pronotum broadly expanded, forming distinct scutellar lobe with angular corners (drawn after Monrós 1953a) F Pronotum margined at base, not crenulate G Pronotum not margined at base, crenulate.