1. Elytra shining, not reticulate, distinctly punctate (Fig. 3); length to width ratio of fourth antennomere in either the male or the female greater than 5.0x.............................................. 2

— Elytra reticulate, at best vaguely punctate (Fig. 1-2, 4); length to width ratio of fourth antennomere in either the male or the female less than 5.0x.................................................... 3

2(1). Each elytron with forked costa behind humerus (Fig. 3), with distinct sulcus behind humerus between costa; mesosternum black; first tarsomere of male protarsi enlarged, but not wider than third tarsomere; aedeagus as in Fig. 29, 36............................ H. sulcatipennis Jacoby

— Each elytron with five vague to distinct costae; mesosternum yellow-orange; first tarsomere of male protarsi enlarged, wider than third tarsomere............................ H. tenuicornis Jacoby

3(1). Pronotum flat, without obvious depressions, ridges or callosities, widest basally, lateral margins tapering to anterior margin (Fig. 19); sternum entirely orange; aedeagus as in Fig. 25, 32................................................................................................................. H. barri Gilbert sp. nov.

— Pronotum slightly convex, with obvious depressions, ridges or callosities, widest at middle; sternum not entirely orange; mesosternum orange to black.................................................................... 4

4(3). First tarsomere of male prothoracic leg not wider than third tarsomere; aedeagus as in Fig. 28, 35........................................................................................................ H. intermedius (Jacoby) First tarsomere of male prothoracic leg enlarged, as wide as or wider than third tarsomere...................................................................................................................................... 5

5(4). Size larger, 4.6 to 6.5 mm long; both sexes with stout antennomeres (fourth antennomere approximately 2.4x longer than wide); aedeagus as in Fig. 27, 34...... H. elongatus (Jacoby)

— Size smaller, 3.5 to 5.6 mm long; antennae slender in both sexes, more so in the female (fourth antennomere 3.7x - 4.3x longer than wide) than male (2.8x – 3.6x longer than wide)............ 6

6(5). Size generally smaller, 3.5 to 4.7 mm long; antennomeres 2-3 subequal in length; elytra impunctate; aedeagus as in Fig. 30, 37.............................................. H. smithi Gilbert sp. nov.

— Size generally larger, 4.2 to 5.6 mm long; antennomere 3 distinctly longer than 2; elytra indistinctly punctate........................................................................................................................................ 7

7(6). Vertex with “v-shaped” ridge; postclypeus abruptly elevated into anterolateral ridge; pronotal posterolateral angles acute, distinct; aedeagus as in Fig. 31, 38.................................................................................................................................................... H. sydneyae Gilbert sp. nov.

— Vertex without “v-shaped” ridge; postclypeus not elevated into anterolateral ridge; pronotal posterolateral angles indistinct to absent; aedeagus as in Fig. 26, 33........................................................................................................................................ H. corrugatus Gilbert sp. nov.