1	All legs including coxae yellow	H. flavipes
–	Coxae and femora light brown to brown	2
2	Head with one or more stout cheek setae (Fig. 13); antennal segment VIII only weakly narrowed to base; pelta with posterolateral corners clearly curving away from anterior margin of tergite II (Fig. 16); antennal segment IV usually sharply bicoloured with basal third yellow and slender, at least 1.8 times as long as wide (Fig. 14)	3
–	Head with cheek setae weak and not prominent (Fig. 7); antennal segment VIII strongly narrowed to base, sometimes with distinct pedicel; pelta with posterolateral corners either confluent with anterior margin of tergite II (Figs 9, 10), or only very weakly curving away (Figs 18, 21); antennal segment IV either uniformly brown (Figs 12, 20), or if weakly bicoloured and increasingly pale toward almost yellow pedicel then scarcely 1.6 times as long as wide (Fig. 19)	5
3	Tergites III–IV with posteroangular setae at least 0.6 as long as median length of tergite; female with tergite IX setal pair S3 as long and slender as S1	H. dubius
–	Tergites III–IV with posteroangular setae less than 0.3 as long as median length of tergite (Fig. 23); female with tergite IX setal pair S3 no more than 0.6 as long as S1	4
4	Female with tergites VI–VIII lateral setae no more 0.3 as long as median length of these tergites (Fig. 24)	H. lanaiensis
–	Female with tergites VI–VIII lateral setae more than 0.6 as long as median length of these tergites	H. perkinsi
5	Female with pronotal anteroangular setae scarcely 0.5 as long as width of fore tibia; male sternite VIII apparently with no pore plate	H. laticornis
–	Female with pronotal anteroangular setae at least 1.5 times as long as width of fore tibia; male sternite VIII with transverse pore plate	6
6	Posterolateral corners of pelta rounded but close to anterior margin of tergite II (Fig. 18); pore plate on sternite VIII of male large, occupying about half of sternite area; female with antennal segment IV paler on basal third (Fig. 19); tergites II–VII of macropterae each with two pairs of curved or sigmoid wing-retaining setae	H. flavitibia
–	Posterolateral corners of pelta drawn out along anterior margin of tergite II (Figs 3, 9, 10); pore plate on sternite VIII of male slender and transverse; female with antennal segment IV brown (Fig. 12); tergites III–VII of macropterae each with only posterior pair of wing-retaining setae curved or sigmoid [large male with tubercles behind eyes (Fig. 1), and fore tibia with tubercle at inner apex]	H. magnaccai sp. n.