7Q 



1873.] ' u [Crotch. 



18. Antennas 10-jointed, cavities closed Rhizophagidce. 



Antennae 11-jointed 19 



19. Tarsi deeply bilobed, maxillary palpi securiform. ... Erotylidce. 



Tarsi lobed beneath, 4th joint smaller Telmatophilidce. 



Tarsi simple 20 



20. Antennae moniliform, segments equal Cucvjidce. 



Antennas clavate, 1st segment elongate 21 



21. Anterior coxal cavities open Atomariidce. 



Anterior cavities closed Bitomida. 



22. Tarsi 4 jointed Cotydiida . 



Tarsi 5-jointed, coxae all distant Elmidce. 



24. 



24. Ventral segments 1-3 connate 25 



Ventral segments free 28 



25. Hind coxae sub-contiguous 26 



Hind coxae separated Elm idee. 



26. Tarsi 4.jointed, legs fossorial Heteroceridce. 



Tarsi 5-jointed, hind coxae sulcate 27 



27. Ventral segments 6-7, antennae filiform Psephenidce. 



Ventral segments 5, legs retractile Cistelida . 



Ventral segments 5, antennae irregular Parnidm. 



28. Tarsi 3-jointed, elytra short, truncate Micropeplidee. 



Tarsi 4-jointed, antenna} 9-jointed Georyssidie. 



Tarsi 4-jointed, claws dentate Coccinellidce. 



Tarsi 5-jointed, antennas 10-jointed RhizopTiagidm. 



Tarsi 5-jointed, antennas 11-jointed 29 



29. Hind coxae sub-quadrate, not reaching the margin, 



elytra trucate, 2 dorsal segments corneous llisterid(p. 



Hind coxae transverse reaching the margin 30 



30. Tarsi generally dilated, 4th joint small Nitidulidce. 



Tarsi simple, 1st joint short Trogositidce. 



The family Othniidce is referred as a distinct family to the Heteramera 

 near Lagriidce. 



Hydrophilid.e. 



Anterior coxae prominent, couical, sub-contiguous, cavities open or 

 closed. 



Posterior coxae flat, nearly contiguous, reaching the margin. 



Ventral segments 5 (occasionally 7). 



Tarsi 5-jointed, posterior legs often fimbriate, claws generally dilate 

 at base. Evidently allied to SilpTiidm by the coxae and increased number 

 of segments in some species ; the mentum is large, quadrate, labial palpi 

 distant at base, maxillary palpi elongate ; antennae 6-9 jointed, side 

 pieces of mesosternum not divided. 



Leptisid.e. 



Anterior coxae oval, not prominent, cavities open, no trochantin. 



Posterior coxae flat. 



Ventral segments 6. 



Tarsi 5-jointed, 4th oblique beneath, with a brush of hairs. 



