MONOGRAPH OF WEST INDIAN STAPHYLINIDAE 175 



KEY TO WEST INDIAN SPECIES OF OSORIUS 



1. Anterior margin of clypeus creuulate tliroughout 2 



Anterior margin of clypeus not crenulate througliout 18 



2. Anterior angles of clypeus conspicuously produced 14. biarmatus 



Anterior angles of clypeus not produced 3 



3. Abdominal tergites impunctate on disk or with an occasional isolated 



puncture 4 



Abdominal tergites at least sparsely punctate 8 



4. Base of pronotum three-fourths or four-fifths as wide as apex 5 



Base of pronotum nine-tenths as wide as apex 6 



5. Anterior margin of clypeus slightly rounded 1. regulus 



Anterior margin of clypeus slightly emarginate 2. darlingtoni 



6. Eighth tergite alutaceous 7 



Eighth tergite not alutaceous, coriaceous 5. salutator 



7. Eighth tergite "longitudinally alutaceous" 4. fratellus 



Eighth tergite with a dense network of fine lines 3. crenulifrons 



8. Labrum with large smooth swollen area anteriorly, separated from alutaceous 



base by setigerous punctures 6. hirtilabris 



Labrum normal, flat, alutaceous, with marginal setae only 9 



9. At least basal tergites of abdomen distinctly alutaceous 10 



Abdominal tergites not more than faintly alutaceous 15 



10. Clypeus slightly emarginate in front 11. manni 



Clypeus slightly rounded or sinuate in front 11 



11. Anterior face of front tibia with setigerous punctures scattered 12 



Anterior face of front tibia with punctures in a single series 13 



12. Pronotum evenly narrowed posteriorly, very distinctly punctate- 8. cubensis 

 Pronotum suddenly narrowed behind middle; punctures minute and 



indlstiuct 9. strictus 



13. Pronotum feebly narrowed behind 14 



Pronotum strongly narrowed behind 17. turquinus 



14. Pronotum with moderate punctures 15. buscki 



Pronotum with sparse and fine punctulae 16. oriente 



15. Anterior face of front tibia with setigerous punctures scattered 16 



Anterior face of front tibia with punctures in a single series 17 



IG. Clypeus distinctly emarginate at middle, margin coarsely and irregiilarly 



creuate; 9M; mm. long 7. daemon 



Clypeus truncate and finely crenate ; 7^^ mm. long 10. socors 



17. Abdominal tergites very sparsely punctate; over 10 mm. long — 12. cautis 

 Abdominal tergites closely punctate ; less than 9 mm. long__ 13. mediocris 



18. Angles of clypeus produced in acute teeth at least one-fourth as long as 



distance between them 19 



Angles of clypeus not or finely or obtusely denticulate 20 



19. Abdominal tergites sparsely punctate; 'JVj mm. long 23. hubbardi 



Abdominal tergites closely punctate ; 6 mm. long 24. notmani 



20. Less than 10 mm. long 21 



Length 12 mm. or over 22. intermedius 



21. Length not over 3% mm 25 



Length more than 4 mm 22 



22. Entire dorsum distinctly alutaceous 20. schwarzl 



At most with head and pronotum strongly, elytra indistinctly, and disk of 



abdominal tergites vaguely alutaceous - — 23 



23. Clypeus broad, distinctly emarginate 24 



Clypeus narrow, not distinctly emarginate 21. haitiellus 



