382 MISCELLANEA ENTOMOLOGICA, 



convenience to those interested in the subject, and who are perhaps 

 far removed from access to books, to make the monograph complete, 

 by including the descriptions of all the species. 



Lacordaire in his " Genres des Coleopteres " places Diphucephala 

 in his Sub-Tribe Sericides which he characterizes thus : — " Melo- 

 lonthidce having the labium soldered to the mentum, mandibles 

 prolonged on their internal face into a large thin plate. Labrum 

 none or not separable from the clypeus. Abdominal segments not 

 soldered together." 



The Sub-Tribe (Sericides) is represented in Australia by three 

 very distinct and characteristic groups. 1. The Phyllotocides, a 

 group which I monographed in the Transactions of the Ent. Soc. of 

 New South Wales in the year 1863. 2. The Diphucephalides the 

 group now under consideration and 3. The Mcechidiides, which 

 includes all insects referable to the genus Mcechidius of W. S. 

 Macleay. 



The second of these groups is thus characterized by Lacordaire: — 

 " Labium corneous, soldered to the mentum. Outer lobe of the 

 maxillae toothed. Clypeus double. Posterior coxse narrow. 

 Metasternum cut squarely behind." 



The following is a translation of Lacordaire's definition of the 



Genus, Diphucephala. 



Mentum flat or convex, narrowed at the base, slightly rounded, 

 truncate or slightly emarginate in front. 



Maxillce robust, the external lobe armed with 5 or 6 teeth. 



Palpi very short, the last joint of the labial obconic, that of the 

 maxillary oval, more or less thick. 



Head moderately long, flat ; clypeus large ; nearly square, 

 separated from the forehead by a fine suture, varying in the sexes, 

 emarginate in front. 



Eyes moderate. 



Antennce short, of eight joints : 1st long, swelled at the apex, 

 2nd nearly as long, obconic, 3rd short, 4th elongate and compressed, 

 5th very short, the three last forming an oblong mass in the males, 

 oval in the females. 



