6 LAMELLICORNIA — COPRIDAii. 



Female without prominence on front of thorax. L. 2h — 41. 

 Common. 0. fracticornis, Preys. 



2, Sides of thorax rounded throughout ; anterior 

 angles blunt. 



Head and thorax black, with slight bronze reflection ; 

 elytra yellow, sprinkled with a network of black. Head 

 rounded, slightly emarginate in front ; thorax punctured 

 closely in front, gradually more diffusely behind ; elytra 

 with very feeble punctured striae, interstices flat, diffusely 

 and finely granulate. Male with a thin upright horn on 

 forehead, vertex of head not produced into a plate ; female 

 with two strong transverse ridges on forehead, thorax with 

 a prominence in front. L. 2 J — 4 1. Common. 



0. nitchicornis, Lin. 

 -B. Forehead with a straight transverse ridge in male; 



length 2 — 2^ lines. 



Dull black, head and thorax often slightly bronze ; 

 upper-side with short gray bristles. Head rounded, slightly 

 emarginate in front; thorax finely punctured and granu- 

 late ; elytra with very feeble notched striae, interstices flat 

 diffusely punctured and granulate. Female with two trans- 

 verse ridges, the front one bent. Common. 0. ovahts,Lin. 



APHOnilDAB, 



A. La brum and mandibles entirely hidden in mouth. 



a. Head flat ; at least part of eyes uncovered when head 



is retracted. 

 Molar tooth of mandibles composed of horny plates ; 

 lobes of maxillae membranous. Posterior coxae somewhat 

 dilated ; posterior tibiae with a ring of bristles at apex. 



Aphodius, 111. 

 h. Head convex; eyes wholly hidden when head is 



retracted. 

 Molar tooth on mandibles solid. 



I, Elytra entirely covering abdomen. 



Thorax without transverse furrows. Lobes of maxillae 

 membranous. Posterior coxae as in ApJwdius. 



Ammoecius, Muls. 



II, Half of last abdominal segment not covered by 

 elytra. 



