DIAPERINI NORTH OF MEXICO- 



Figure 3. — Phylogenetic tree of the North American species of Plaiydema: A, apical sclerite 

 composed of two parameres (see plate 4); AA, apical sclerite composed of a single piece 

 (see plate 5); B, head with distinct longitudinal frontal impression or horned; BB, head 

 lacking frontal impression; C, frons with horns in male, tubercles in female; CC, frons with 

 longitudinal impression only; D, antennae bicolored; DD, antennae unicolorous; E, 

 elytra bicolored; EE, elytra unicolorous. 



