LUCANUS. 3 



2, Tarsal claws equal. 



Clypeus not separate from forehead ; labrum hidden ; 

 mandibles hidden, membranons part much developed ; 

 lig'ula horny. Antennae with ten joints, club three-jointed, 

 generally alike in both sexes. Elytra not reflexed at sides. 



Cetoniidae. 



LUCAWmAE. 



A, Eyes partly divided. 



a, liabrum deflexed ; eyes divided about half through. 



Outer lobe of maxillae much longer than inner, latter 

 without horny hook in either sex ; ligula split ; mentum 

 broad. Male with head large and mandibles very strongly 

 developed. Luc anus, Lin. 



b, Labrum prominent ; eyes almost entirely divided. 



Lobes of maxillae about equal in length, inner one with 

 a horny hook in female ; ligula split ; mentum broad. 



Dorcus, Mc.L. 

 JB, Eyes entire. 



Labrum hidden ; maxillae with only one lobe ; ligula 

 entire, small; mentum narrow. Sinode^idron, Hellw. 



Lucamis, 



Black, elytra chestnut-brown. Club of antennae with 

 four plates ; posterior tibiae with three teeth. Male with 

 head as broad as, or broader than thorax ; mandibles as long 

 or nearly as long as elytra, strongly toothed. Female with 

 head much narrower than thorax ; mandibles small, with 

 two rather blunt teeth in middle. L. (without mandibles) 

 1 — 2 inches. Common. L. cervus, Lin. 



Dorcus. 



Black, dull. Elytra very closely punctured, slightly 

 wrinkled ; posterior tibiae with a little tooth near middle. 

 Male with head as broad as thorax, latter finely and rather 

 diffusely punctured, labrum truncate and mandibles shorter 

 than head. Female with head narrower than thorax, latter 

 very closely punctured ; labrum emarginate and mandibles 

 small. L. 7 — 10 1. Common. D. parallelo'jjipe,dtis,lAi\. 



