Opinions from H. M. A. Rice 1959
- 'Mycetophaetus intermedius is recombined as Plecia intermedia'
- 'Penthetria belongs to Bibionidae'
- 'Penthetria angustipennis is recombined as Plecia angustipennis'
- 'Penthetria avunculus is a subjective synonym of Plecia curtula'
- 'Penthetria avus is recombined as Plecia avus'
- 'Penthetria brevipes is a subjective synonym of Plecia pulla'
- 'Penthetria canadensis is recombined as Plecia canadensis'
- 'Penthetria curtula is recombined as Plecia curtula'
- 'Penthetria dilatata is recombined as Plecia dilatata'
- 'Penthetria elatior is recombined as Plecia elatior'
- 'Penthetria falcatula is a subjective synonym of Plecia transitoria'
- 'Penthetria fragmentum is a subjective synonym of Plecia transitoria'
- 'Penthetria fryi belongs to Penthetria'
- 'Penthetria lambei is a subjective synonym of Plecia pictipennis'
- 'Penthetria nana is recombined as Plecia nana'
- 'Penthetria ovalis is a subjective synonym of Plecia pictipennis'
- 'Penthetria pictipennis is recombined as Plecia pictipennis'
- 'Penthetria platyptera is recombined as Plecia platyptera'
- 'Penthetria pulchra is recombined as Plecia pulchra'
- 'Penthetria pulla is recombined as Plecia pulla'
- 'Penthetria reducta is recombined as Plecia reducta'
- 'Penthetria separanda is a subjective synonym of Plecia pictipennis'
- 'Penthetria similkameena is recombined as Plecia similkameena'
- 'Penthetria transitoria is recombined as Plecia transitoria'
- 'Penthetria whipsawensis belongs to Penthetria'
- 'Plecia belongs to Bibionidae'
- 'Plecia cairnesi belongs to Plecia'
- 'Plecia kelownaensis belongs to Plecia'
- 'Plecia minutula belongs to Plecia'
- 'Plecia tulameenensis belongs to Plecia'