64 R. W. Dawson 



26. Elytra short, truncate, their length about equalling their com- 

 bined width (p. 244) Trichius 



Elytra much longer, not truncate, length distinctly greater than 

 their combined width 27 



27. Elytra with numerous, very distinct, longitudinal grooves 

 (p. 230) Strigoderma 



Elytra not distinctly, longitudinally grooved 28 



28. Pronotum long and narrow, one and one-half times as long as its 

 basal width (p. 227) Macrodactylus 



Pronotum much shorter, but little if any longer than wide 

 (p. 225) Dichelonyx 



29. Terminal portion of elytra with a very narrow membranous 

 edge (p. 228) Anomala 



Terminal portion of elytra not having a membranous edge 30 



30. Tarsal claws, especially the front ones, alike in size and shape 34 



Tarsal claws, especially the front ones, unequal, decidedly so in 

 most males, but often only slightly so in the females 31 



31. Pronotum with a narrow, but distinct rim or margin at the 

 base 33 



Pronotum not distinctly margined at the base 32 



32. Front and clypeus separated by a ridge or keel; larger, black- 

 ish or dark grown species (p. 235) Ligyrodes 



Front and clypeus separated by an obscure suture; smaller, 

 pallid or yellowish species (p. 232) Cyclocephala 



33. Clypeus separated from the front by a distinct suture 



(p. 231) Cotalpa 



Clypeal suture nearly or quite obsolete (p. 231) Pelidnota 



34. Epimera of mesothorax visible from above, at the base of the 

 elytra 39 



Epimera of mesothorax not visible from above 35 



35. Front tibiae with five teeth on the outer edge (p. 244) Valgus 



Front tibiae with only three teeth on the outer edge 36 



36. Clypeus separated from the front by a ridge or keel 38 



170 



