156 
Psyche 
[December 
NOTES ON NORTH AMERICAN NITIDULIDAE, III: 
PHENOLIA, SORONIA, LOBIOPA, AMPHOTIS 
By C. T. Parsons 
Biological Laboratories, Harvard University 
Erichson, who erected the genera Phenolia, Soronia, 
Lobiopa, and Amphotis, in 1843, had a clearer idea of their 
relationships than subsequent workers. For instance, 
Reitter placed Phenolia, and Lobiopa in Soronia; whereas 
Horn suppressed Amphotis as well as Lobiopa but resur- 
rected Phenolia. Later Sharp and then Grouvelle, without 
giving reasons, raised them all to the good standing they 
have had subsequently. Since all of the writers have made 
mistakes in their diagnoses and since their descriptions have 
been incomplete, the genera are here redescribed. 
1. Front lobed over the insertion of the antennae 2. 
Front not lobed over the insertion of the antennae 
Phenolia Er. 
2. Antennal grooves parallel 3. 
Antennal grooves strongly convergent posteriorly 
Soronia Er. 
3. Mentum not emarginate anteriorly Lobiopa Er. 
Mentum emarginate anteriorly Amphotis Er. 
Phenolia Erichson 
Phenolia Erichson, 1843, in Germar, Zeitschr. Ent., 4 : 299. 
Soronia (pars) Reitter, 1873, Syst. Eintheil, Nitid., p. 47. 
The front not lobed over the insertion of the antennae; 
eye facets about as in Lobiopa, coarser than in Soronia and 
Amphotis; mandibles bidentate at tip; antennal grooves 
parallel; labrum feebly bilobed; labial palpi incrassate; 
mentum distinctly pentagonal ; prosternum behind the 
coxae expanded and deflexed; elytra feebly costate; epi- 
