2 
Psyche 
[March 
Characters of the argentinicus species-group. — Antennae, legs, 
and body relatively slender for the genus, the abdomen of the male 
especially slender toward the base; body with a very limited amount 
of erect hair, the propodeum at most weakly hairy on the sides; pos- 
terior tibiae of female with a double row of strong serrations. Wings 
without a well-defined irregularity at the base of the first discoidal 
cell. Front and vertex unusually narrow for the genus; posterior 
margin of pronotum angulate; propodeum sloping smoothly, with 
or without rugae; apical tarsal segments of female bearing lateral 
spines; claws of female strongly dentate, the outer ray curved so as 
to be nearly parallel to the inner ray; claws of male slender, curved, 
deeply bifid. Females black, the antennae orange apically, the wings 
varying from yellowish brown to bright orange; males with a com- 
plex pattern of yellow, ferruginous, and fuscous, the wings hyaline, 
tinged with yellowish brown. 
Key to species of argentinicus group 
Females 
1. Front and vertex relatively broad, upper interocular distance sub- 
equal to or slightly exceeding length of third antennal segment; 
ocello-ocular line slightly exceeding postocellar line 
argentinicus ( Banks) 
Front and vertex unusually narrow, upper interocular distance 
much shorter than third antennal segment; ocelli rather large, 
postocellar line exceeding ocello-ocular line 2 
2. Wings orange, with a very narrow fuscous outer margin; at 
least the outer 7 antennal segments orange above 
long ulus (Banks) 
Wings translucent, lightly tinged with yellowish and with fus- 
cous; outer five antennal segments orange above 
vitreus (Fox) 
Males 
i. Ocelli unusually large, in a compact, elevated triangle, the lateral 
ocelli removed from the eye margins by at most about half 
their own greatest diameters; mesoscutum without paired 
streaks, sometimes with a median pale streak; inner margin of 
parameres with a long^ continuous series of pegs (Figs. 16, 
17) 2 
Ocelli of moderate size, the triangle not much elevated, the 
laterals removed from the eye margins by at least 0.8 X their 
