NORTH AMERICAN COLEOl'TERA. 215 



5. --Fixed spur of % hiud tibia very short or absent (fig. 16) 6. 



Fixed spur at least moderately loiitj 7. 



6. — AnteiiuiE lOjointed Group IV, ephilida. 



Auteiinaj 9-joiiited Group V, longitarsis. 



7. — Hind tibia? % with a siuuation of the apex at the base of fixed spur (fij;. 



13-14) 8. 



Hind tibipe % squarely truncate (fig. 9-10) 9. 



8. — Clypeus entire, deeply concave, the margin widely reflexed ; antennse 



9-jointed Gioup VI, dispar. 



Clypeus more or less euiarginate, feebly concave ; antenna; 10-jointed. 



Group VII, congTua. 

 9. — First joint of bind tarsus in both sexes with an abruptly formed process on 



the outer side (fig. 15). Group VIII, calceata. 



First joint of hind tarsus of normal form 10. 



10. — AntenniE 10-jointed. 



Body above glabrous Group IX, fusca. 



Body above pubescent Group XI, ilicis. 



Antennfe 9-jointed ; body sometimes hairy Group X, balia. 



11. — Anterior tibise normally tridentate 12. 



Anterior tibise bidentate, the apical tooth more prolonged (fig. fi). 



Group XVIII, maculicoUls. 



12. — Antennfe lO-jointed 13. 



AntenufE 9-jointed Group XV, quercus. 



13. — Body more or less hairy 14. 



Body glabrous 15. 



14. — Clypeus more or less emargiiiate, not coarctate at base. 



Group XII. crenulata. 

 Clypeus entire, rather deeply concave, the base coarctate (fig. 2). 



Group XVI. tristis. 

 15. — Form moderately robust, margin of thorax entire. .Group XIII, submucida. 

 Form elongate, parallel, margin of thorax rather strongly crenate. 



Group XIV, ig-nava. 

 Form ovate, claws of male dissimilar on the diffierent tarsi, the two claws 

 of the middle tarsi very unlike ; claws of female normal (figs. 42-45). 



Group XVII, heterodoxa. 



Group I, lanceolata. 



Body short, robust, parallel S or ovate 9 > clothed with scales 

 partly concealing the surface, the male winged, female apterous. 

 Thorax not narrowed behind, the margin more or less crenate. Legs 

 shorter and stouter in the female, the hind tarsi not longer than the 

 tibise. Spurs of hind til)i;e slender and moderately long, free in both 

 sexes. Ventral segments of male carinate along the median line. 

 Antenna? 10-jointed. Tarsal claws toothed near the base. 



This group contains but one well-known species originally described 

 as iMelolontha by Say, and afterwards made the type of Tostegoptera 



