144 ARTHROPOD A. 



BRACHELYTRA. Elytra very short, not covering the abdomen. 

 Antennse short, never clubbed. Two anal appendages. Voracious 

 animal-feeders, occasionally living on decaying vegetable matter 

 or carrion. Larva resembling the imago. 



In Staphylinidae the abdomen is free and at the tip furnished 

 with vesicular papillas connected with glands secreting a dis- 

 agreeable fluid. Some species reside in ants' nests; Velleius dila- 

 tatus in the nests of hornets. Pselaphidae are trimerous, have 

 the abdomen fixed, and without anal appendages. They live in 

 moss, and many in ants' nests. In Articerus each antenna con- 

 sists of a single joint. 



Lathrobium. Atemeles. 



Micropeplus. Oxyporus. Aleochara. 



Anthobium. Astrapaeus. Oxypoda. 



Homalium. Quedius. Homalota. 



Lesteva. Velleius. Myrmedonia. 



Anthophagus. Philonthus. Autalia. 

 Micralymma. Ocypus. 



Piestus. Staphylmus. Pselaphidce. 



Syntomium. Xantholinus. Claviger. 



Oxytelus. Othms. Articerus. 



Bledms. Mycetoporus. Euplectus. 



Osorius. Tachmus. Bryaxis. 

 Platystethus. Conosoma = Co- Amaurops. 



Stenus. nurus. Pselaphus. 



Psederus. Hypocyptus. Chennium. 



Sunius. Diglossa. Ctenistes. 



Lithocharis. Dmarda. Tjrua. 



Stilicus. Lomechusa. Faronus. 



Spirachtha. 



PALPICORNIA. Maxillary palpi elongate. Antennas short, 

 generally club-shaped. Mostly aquatic ; in the perfect state 

 herbivorous. 



In some of the Hydrophilidas the palpi are longer than the 

 antennas. Sphaeridiidas are mostly found in excrementitious 

 matter. 



Sphoeridiid<B. Hydrochus. Laccobius. 



Cercyon. . Hydnena. Hydrobius. 



Sph^riduim. Helophorus. Eygmodus. 



Spercheus. Hydrous. 



Globaria. Hydrophilus. 



HydnptiRd*. Berosus. Philhydrus. 



Ochthebius. Limnebius. Tropisternus. 



