2 LAMELLICORNIA. 



B S, Ventral segments of abdomen freely articu- 

 lated ; posterior tibiae with two apical spines. 



Intermediate legs placed near each other. Eyes round 

 or only slightly narrowed ; antennae with nine joints ; 

 scutellum distinct; anterior tarsi distinct. Aphodiidae. 



2. Epimera of metathorax free ; antennae with 

 eleven joints. 

 Intermediate legs usually placed near each other. Eyes 

 wholly or partly divided; scutellum usually moderately 

 large ; apex of abdomen often covered by elytra. Ventral 

 segments of abdomen freely articulated ; posterior tibiae 

 with two apical spines. Geotrtipidae. 



II, Abdomen with five ventral segments. 



Intermediate legs placed near each other. Eyes some- 

 times partly divided ; scutellum rather small ; apex of 

 abdomen covered by elytra. Epimera of metathorax 

 hidden ; ventral segments of abdomen slightly moveable ; 

 posterior tibiae with two apical spines. Antennae with 

 ten joints. Trogidae. 



6. Second to sixth pairs of spiraclesp laced in ventral 

 abdominal segments. 



Ligula soldered to mentum. Abdomen with six ventral 

 segments, penultimate dorsal and ventral segments soldered 

 together. Club of antennae with from three to seven 

 joints, inner-side of plates bare ; last pair of spiracles un- 

 covered. 



I, Penultimate spiracles placed in the same line with 

 the front ones. 



Clypeus generally distinct from foreliead ; labrum usually 

 prominent, horny ; ligula sometimes membranous. Antennae 

 with from seven to ten joints, club often stronger in male. 



Melolonthidae. 



II, Penultimate spiracles placed more outward than 

 front ones. 



1, Tarsal claws unequal. 

 Clypeus generally distinct from the forehead ; labrum 

 usually prominent ; ligula homy. Antennae with nine or 

 ten joints, club three-jointed, alike in both sexes. 



II a t did a e. 



