Scarabaeidae of Nebraska 63 



17. Yellow hairs rather thickly and evenly distributed over the sur- 

 face of the elytra (p. 191) Ochodaeus 



Yellow hairs arranged in very definite, single, longitudinal rows 



on the elytra (p. 198) Glaresis 



18. Inner margins of elytra straight beyond the scutellum, and 

 capable of being in contact nearly or quite to the apex 19 



Inner margins of elytra curved, not capable of contact beyond 

 the middle; the tips widely separated (p. 197) Aniphicoma 



19. Hind tarsi with a single large claw (p. 227) Hoplia 



Hind tarsi with two claws 20 



20. Hind coxae dilated into plates which usually cover all of the 

 first and half of the second abdominal segments; the widest 

 portion of the coxal plates about twice the width of the hind 

 femora (p. 203) Serica 



Hind coxal plates but little dilated, the widest portion never 

 twice the width of the femora, and first abdominal segment 

 never covered at the middle by the coxal plates 21 



21. Abdomen with the sixth ventral segment much reduced in size, 

 often entirely covered by the fifth segment, in which case the 

 abdomen appears to have only five ventral segments 22 



Abdomen with the sixth ventral segment clearly visible, not re- 

 duced in size 23 



22. Tarsal claws simple, not toothed on the inner edge; antennae 

 9-segmented (p. 211) Diazus 



Tarsal claws cleft at the tip, or toothed on the inner edge; an- 

 tennae 10-segmented (p. 207) Diplotaxis 



23. Labium developed into a large concave plate concealing the 



other mouth parts, and usually the antennae as well 



(p. 241) Cremastochihis 



Labium of the usual form, not entirely covering the other mouth 

 parts, and never concealing the antennae 24 



24. Antennal club composed of five or six plates (p. 224) Polyphylla 



Antennal club composed of only three plates 25 



25. Pronotum relatively large and broad, distinctly wider than long 29 



Pronotum relatively smaller, but little, and sometimes not at all 

 wider than long 26 



169 



