1	Eyes absent. Known only from a cave in Ecuador	Troglochares
–	Eyes present	2
2	Eyes completely divided into dorsal and ventral sections by a lateral projection of frons. Size small (<3 mm)	Quadriops
–	Eyes not divided into dorsal and ventral sections by frons. Size variable	3
3	Labrum concealed by clypeus, elytral margins broadly explanate. Body extremely dorsoventrally compressed	Helobata
–	Labrum not concealed by clypeus elytral margins not or at most weakly explanate. Body form variable but rarely dorsoventrally compressed	4
4	Elytra with distinctly impressed sutural striae. Only Neotropical region	Chasmogenus
–	Elytra without sutural striae. Both Neotropical and Nearctic	5
5	Prosternum with strongly elevated median carina	Crucisternum
–	Prosternum without median carina; at most tectiform medially	6
6	Metafemora entire glabrous. Size small (<3 mm)	Tobochares
–	Metafemora pubescent at least on basal half or anterior third. Size variable	7
7	Fifth ventrite entire, without apical emargination or truncation. Antennae with nine antennomeres. Maxillary palps shorter than the width of the head	Radicitus
–	Fifth ventrite with apical emargination or truncation. Antennae with eight or nine antennomeres. Maxillary palps variable in length	8
8	Elytral systematic punctures very distinct, distinctly larger than surrounding ground punctation. Antennae with nine antennomeres	Katasophistes
–	Elytral systematic punctures indistinct, usually blending with surrounding ground punctation. Antennae with eight or nine antennomeres	9
9	Antennae with nine antennomeres. Size variable, but rarely less than 4 mm. Extremely common and widespread throughout the New World	Helochares
–	Antennae with eight antennomeres. Rare and only known from the Guiana Shield region of South America. Size very small (< 3 mm)	10
10	Body form circular, rounded. Size very small (1.9-2.3 mm)	Globulosis
–	Body form ovoid, parallel sided. Size exceedingly small (1.1–1.5 mm)	Nanosaphes