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6(5). Tarsus 5-segmented . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Omaliinae

Tarsus 2- or 3-segmented . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Leptotyphlinae

7(5). Abdomen with complete second sternite (seven sternites can be counted) . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Oxytelinae

Second sternite absent or rudimentary (six sternites can be counted) . . . . . . . . . . . . ... 8

8 (7). Anterior margin of labrum with two long anteriorly directed processes which are setose

within. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . Megalopsidiinae

Labrum without such processes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

9(8). Antenna 10-segmented , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Hypocyphtinae

Antenna II-segmented . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

10(9). Last segment of maxillary palpus longer than penultimate, slightly arenate, with an

oblique, elongate, concave truncation of distinctive texture at apex . . . . . . .Pinophilinae

Last segment of maxillary palpus not so formed. . . . . . . . . . . . . . . . . . . . . . . . . . . .11

11 (10). Metasternum with expanded plate covering part of posterior femur .. ...Trichopseniinae

Metasternum without such plates; femur exposed. . . . . . . . . . . . . . . .. . . . . . . . . . .12

12(11). First segment of maxillary palpus elongate, at least one-half as long as second . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . Euaesthetinae

First segment of maxillary palpus short, never more than one-third as long as second. . 13

13(12). Abdomen without paratergites (without double margin) . . . . . . . . . . . . . . . . . . .. . . . 14

Abdomen with paratergites (with prominent double margin) . . . . . . . . . . . . .. . . . . ..15

14(13). Hypomeron not visible from the side . . . . . . . . Sepedophilus Gistel (Tachyporinae)

Hypomeron visible from the side at least in part. . . . . . . . . . . . . . . . . . . . . . . . . . . .16

15(13). Anterior coxae small, globular, without a transverse or diagonal sulcus on anterior face .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . Lispininae

Anterior coxae large, elongate, with a transverse or diagonal sulcus on anterior face . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . .Osoriinae

16(14). Anterior coxae small, globular. .. . .. . . . . . . . . . . . . . . . . . . . . . . . . . .. . . .Piestinae

Anterior coxae large, elongate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

17 (16). Elytra long, completely covering first tergite. . . . . . . . . . . . . . . . . . . . . . .Proteininae

Elytra not completely covering first tergite . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . .18

18 (17) . Each basal abdominal tergite with a diagonal impressed line from near the middle front

margin to each apical angle; pronotum and elytra costate . . . . . . . . . .Pseudopsinae

Abdomen without such lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

19(18). Head constricted behind eyes to form a distinct neck that is clearly visible from above . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Sides of head converging uninterruptedly to base, not constricted to form a neck that is

clearly visible from above. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . 26

20 (19). Small sclerite (neck plate) present at anterior margin of prosternum. . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..Xantholininae

Neck plate absent. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

21 (20) . Last segment of maxillary pal pus less than one-half as long as penultimate, usually

little longer than width of penultimate, usually subulate or papilliform. . . . . . . . . . 22

Last segment of maxillary palpus at least one-half as long as penultimate, subulate

only in Heterothrops. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23