Crotch.] 



78 



[ Feb. 7, 



— Labial palpi approximate at base 3 



2. Maxillary palpi elongate ; sub-aquatic Hydrophilidce. 



— Anterior angles of thorax produced under the head 



in front Leptinidce ■ 



3. Anterior coxae conical, prominent, contiguous, cavities 



generally open. 



Claws simple, ventral segments 6-7 (rarely 5) 4 



— Anterior coxa; ovate or globose, not prominent, very 



rarely contiguous, ventral segments 5, claws simple. 13 



— Anterior coxae transverse, separated, claws sometimes 



dentate, 2 ventral segments often connate 24 



4. Ventral segments 3, globose - Microsporidce. 



Ventral segments, 5-6 6 



Ventral segments, 7 , 5 



5. Elytra covering or nearly covering the abdomen Trichopterygidtt. 



Elytra short, dorsal segments corneous Staphylinidce. 



6. Elytra short, dorsal segments corneous, rigid Pselaphidce. 



Elytra long, 2 or 3 dorsal segments at most corneous. 7 



7. Posterior coxae contiguous 8 



Posterior coxaa separate 9 



«. Middle coxas oblique, simple Silphida . 



Middle coxae conical prominent Brathinidce. 



9. Tarsi 4-jointed, 3d joint minute 10 



Tarsi 4-jointed, filiform Iritomidce. 



Tarsi 5-jointed 11 



10. Wings fimbriate, size very small Corylophida. 



1st ventral segment elongate Endomych ida . 



11. Hind coxae flat 12 



Hind coxa: sulcate, sub-contiguous Dermestidce. 



12. Elytra entire, eyes coarsely granulate Scydmcenidm. 



Elytra truncate, 3 dorsal segments corneous ScapMdiidm. 



13. 



13. Hind coxae sulcate, front with an ocellus Dermestidce. 



Hind coxaj sulcate, front cavities closed Derodontidas 



Hind coxae flat or sub-prominent 14 



14. Ventral segments free 15 



Ventral segments 1-3 connate 22 



15. Tarsi 3-jointed, anterior cavities closed Latridiidce. 



Tarsi 4-jointed 10 



Tarsi 5-jointed or 5, 5, 4 17 



16. Tarsi filiform, cavities open, ventral segments equal Tritomidm. 



— Tarsi simple, cavities closed, 1st ventral segment 



longer Cioiche. 



— Tarsi bilobed, cavities open, 1st segment longer Endomyehidm. 



17. Claws simple 18 



Claws dentate, 4th joint of tarsi small PTialacridm. 



