23793
These include members of the Histeridae and Silphidae , preying on the larvae of coprophagous and necrophagous insects .
 Histeridae, Silphidae
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Histeridae, Silphidae