114 
Psyche 
[December 
NOTES ON NORTH AMERICAN NITIDULIDAE : 
POCADIUS 
By C. T. Parsons. 
Biological Laboratories, Harvard University 
In addition to the four species of Pocadius treated below 
there are known seven from Asia, two from Brazil, and one 
each from Argentina, Cuba, Europe, and Africa. 
Since helvolus extends southward into Mexico and Cuba, 
and basalts and niger n. sp. are found in Arizona and New 
Mexico, these species are probably of Neotropical origin. 
The California fulvipennis , although described from “Mex- 
ico,” is related to the European ferrugineus in the shape 
and punctation of the elytra, profile of the prosternum, and 
characters of the female genitalia and is probably of Asi- 
atic origin. 
Helvolus , niger n. sp. and basalts are rather closely re- 
lated and quite distinct from fulvipennis. In the use of the 
following key, figures 1-4 should be consulted. 
1. Prosternum in profile strongly arcuate fulvipennis Er. 
Prosternum in profile moderately arcuate or nearly 
plane 2. 
2. Prosternum behind the coxa plane, not deflexed 
basalis Schaef. 
Prosternum behind the coxa more or less deflexed 3. 
3. Pronotum black with hind angles obtusely rounded 
niger n. sp. 
Pronotum testaceous to piceous with hind angles acutely 
rounded helvolus Er. 
Pocadius fulvipennis Erichson 
Pocadius fulvipennis Erichson, 1843, in Germar, Zeitschr. 
Ent., 4: 319. 
