142 



ARTHROPODA. 



CLAVICORNIA. Antennae clubbed at the end, the club 2-5- 

 joiuted. In the larval and perfect stages living mostly on dead 

 animal matter, several in flowers, or in fungi. 



The first three families in the following list are aquatic, except 

 the species of Sostea. The majority are known as the " Necro- 

 phaga." Platypsylla is a remarkable form, a parasite on the 

 Canadian beaver, for which Westwood has proposed a special 

 order Achrioptera. Le Conte indicates its affinity to several 

 families of this group. Paussidae are an isolated family; the 

 joints of the antennae vary from two to ten, all, except the first 

 two when more are present, curiously enlarged. 



Heteroceridce. 

 Heterocerus. 



Parnidfg. 

 Macronychus. 

 Elmis. 



Sostea. 



Georyssus. 



Thorictida. 

 Thorictus. 



Chelonarium. 



Byrrhus. 



Nosodendron. 



Anthrenus. 



Trogoderma. 



Dermestes. 



Attagenus. 



Byturus. 



Cryptophagide 

 Mycetophagus. 

 Corticaria. 



Monotoma. 



Lathridius. 



Atomaria. 



Cryptophagus. 



Antherophagus. 



Elacatis=0thnius. 



Cucujida. 

 Silvanus. 

 Brontes. 

 Inopeplus=Ino. 

 Hemipeplus = 

 Ochrosanis. 



