COLEOPTERA, 511 



Q. Elytra covering the abdomen. 



p. 531 SCYDM/ENID^E. 



(^(^. Elytra not covering the entire 

 abdomen, p. 533. 



SCAPHIDIIDiE. 

 00. Posterior coxse approximate. 

 P. Antennae gradually thickened, or 

 clavate; posterior tarsi not wid- 

 ened, p. 529 SiLPHIDiE. 



PP. Antennae setaceous, filiform, 

 serrate, pectinate, or flabellate, 

 rarely with three somewhat larger 

 terminal segments, in which case 

 the tarsi are widened. 

 Q. Anterior coxae long, with dis- 

 tinct trochantins. 

 R. Abdomen with seven or eight 

 ventral segments, p. 550. 



Lampyrid^. 

 RR. Abdomen with only six 

 ventral segments, p. 552. 



MALACHIIDiE. 



QQ. Anterior coxae without tro- 

 chantins. p. 553..LYMEXYLIDiE. 

 ^'GG. Hind tarsi either only three-jointed or four-jointed, 

 but apparently three-jointed, the third segment being 

 small and concealed in a notch at the end of the sec- 

 ond segment. (See also GGG.) 

 H. Wings fringed with long hairs. 



I. Abdomen with six or seven ventral segments. 



'. Tarsi four-jointed, the third segment small and 

 concealed in a notch at the end of the second 



segment, p. 534 Corylophid^. 



JJ. Tarsi three-jointed. 



K. Antennae slender, verticillate, with long hair, 

 abdomen not prolonged, p. 533. 



Trichopterygid^. 



KK. Antennae short, not verticillate, abdomen 



prolonged, p. 533 HYDROSCAPHiDiE. 



II. Abdomen with only three ventral segments. 



p. 533 SPHiERIIDiE. 



'' HH. Wings not fringed with hairs. 



