CO LEO P TERA . S7 



FF. Metasternum without an antecoxal piece. 

 G. Legs fitted for swimming. 



H. With only two eyes. p. 523 DYTISCIDTE. 



HH. With four eyes, two above and two below, p. 



525 GYRINID^E. 



GG. Legs fitted for walking, p. 537 RHYSSODID.E. 



DD. Ventral part of the first segment of the abdomen visible 

 for its en i ire breadth. 



E. Antennae with a lamellate club (Fig. 74, 8, page 60). 

 F. Plates composing club of antennae not capable of close 

 apposition, and usually not flattened, p. 554. 



LUCANID^E. 

 FF. Plates composing club of antennae capable of close 



apposition, and flattened, p. 556 SCARAB^ID^E. 



EE. Antennae either clubbed or not, but when clubbed not 

 lamellate. 



F. Elytra short, leaving the greater part of the abdomen 

 exposed ; the suture between the elytra when closed 

 straight; wings present, and when not in use folded 

 beneath the short elytra; the dorsal part of the abdom- 

 inal segments entirely horny. 

 G. Abdomen flexible, and with seven or eight segments 



visible below, p. 532 STAPHYLINID^E. 



GG. Abdomen not flexible, and with only five or six 



ventral segments visible, p. 531 PSELAPHIDjE. 



FF. Elytra usually long, covering the greater part of the 

 abdomen ; when short the wings are wanting, or if pres- 

 ent are not folded under the short elytra when at rest; 

 the dorsal part of the abdominal segments partly mem- 

 branous. 

 G. Hind tarsi five-jointed. 



H. Antennae elbowed, and clavate. 



I. Elytra truncate behind, leaving two segments of 

 the abdomen uncovered, p. 541 HISTERID^E. 



II. Elytra entire, p. 553 PTINID.E. 



HH. Antennae rarely elbowed, and then not clavate. 



I. Maxillary palpi as long as or longer than the 

 antennae, p. 527 HYDROPHlLlDjE. 



II. Maxillary palpi much shorter than the antennae. 

 ]. Tarsal claws very large ; the first three abdom- 

 inal segments grown together on the ventral 

 side. p. 543 PARNID^E. 



