162 
Psyche 
[June 
dibles darkest. Head oval, about one-fourth wider than long, with 
a single ocellus very near outer apical angle of the head at the base 
of mandible. Labrum simple, a little wider than long. Antennal 
fossa located near the outer, apical angle of the head at the base 
of the mandible. Antenna three-segmented; first segment about as 
wide as long; second segment about one-fourth wider than first 
and twice as long, widest near apical fourth, with a large acorn-like 
seta at obliquely truncate component of apex, about as long as 
third segment; third segment less than one-third as long as second 
segment and a little more than one-third as wide. Mandibles stout 
at base, arcuate, with two teeth at apex in dorsal view. Maxillary 
palpus three-segmented; first segment longest, about three times as 
long as wide; second segment about as wide as first and almost half 
as long; third segment a little longer than second but only about 
half as wide, apex pointed. Lacinia gradually, irregularly narrowed 
to apex, with a series of stout setae internally in apical half and a 
single large seta in the middle on the outer edge. Labial palpus 
two-segmented, segments of about equal length, first segment wider 
than second. Pronotum about as wide as head but a little shorter, 
with two setae at anterior margin and two in each lateral series. 
Mesonotum and metanotum each about as wide as pronotum but 
a little shorter, each with four transversely arranged discal setae 
and with one large seta and two small setae in the lateral series. 
Abdomen with nine segments, first segment about as wide as meta- 
notum but not quite as long, segments progressively slightly in- 
creasing in width and length through eighth which is slightly wider 
and about as long as metanotum; each with four setae along the 
posterior margin and three in the lateral series. Pseudopod short 
and stout. Urogomphus one-segmented, cylindrical, about four 
times as long as wide, tapered to apex. 
Five specimens taken from field-manure in company with adults 
at Calexico, Imperial county, California, 21 October 1974, E. F. 
Legner collector. 
This species is similar to Paulian’s (1941) description and illus- 
tration of P. americanus, except that the acorn-like seta at the apex 
of the second antennal segment is as large as the third antennal 
segment whereas in P. americanus it is only half as long. 
