Key to the world genera in the Hylastini

1 Procoxae widely separated; elytral scale-like setae absent; elytral sides broadening posteriorly....... Scierus LeConte, 1876

- Procoxae subcontiguous; elytral scale-like setae present; elytral sides nearly parallel............................... 2

2 Surface of elytral disc densely covered by cup-shaped setae; odd numbered interstriae distinctly costate, especially at declivity; pronotal disc surface between large punctures abundantly, minutely punctate (Fig. 4 a); anterior margin of mesoventrite pointed, distinctly extending anteriorly (Fig. 2 a)........................................ Pachysquamus new genus

- Surface of elytral disc sparsely or densely covered by recumbent, hair-like setae; odd numbered interstriae evenly convex; pronotal disc surface between large punctures impunctate or with medium-sized punctures; anterior margin of mesoventrite slightly rounded or straight, extending anteriorly slightly or not (Figs. 2 b, c)....................................... 3

3 Third tarsal segment 1.3–1.7× width of second, fifth broadening apically (Fig. 1 a); pronotal disc with equal or greater number of smaller than larger punctures (Fig. 4 c); prothorax averaging as long as wide (0.9–1.1); mid-frontal transverse impression usually distinct, without inflated area below (Fig. 5 a)..................................... Hylurgops LeConte, 1876

- Third tarsal segment 1.0–1.1× width of second, fifth not broadening apically (Fig.1 b); pronotal disc lacking or with lesser number of smaller than larger punctures (Fig. 4 b); prothorax averaging 1.2× longer than wide [1.0 (in H. salebrosus) to 1.3×]; mid-frontal transverse impression absent or indistinct, if present, inflated area below (Fig. 5 b)...... Hylastes Erichson, 1836