384 Psyche [September-December 
Range 
Mean 
Standard Deviation 
males 
females 
males 
females males 
females 
HW 
0.44-0.51 
0.44-0.54 
0.49 
0.50 
0.024 
0.034 
PW 
0.81-0.91 
0.80-0.91 
0.85 
0.88 
0.034 
0.054 
PL 
0.54-0.63 
0.54-0.64 
0.59 
0.60 
0.30 
0.047 
EL 
1.08-1.20 
1.10-1.28 
1.15 
1.12 
0.052 
0.071 
EW 
0.80-0.92 
0.84-0.99 
0.88 
0.90 
0.034 
0.045 
PW/PL 
1.41-1.58 
1.41-1.54 
1.48 
1.46 
0.05 
0.05 
EL/EW 
1.28-1.36 
1.29-1.38 
1.32 
1.34 
0.03 
0.03 
PW/HW 
1.72-1.86 
1.70-1.86 
1.77 
1.77 
0.05 
0.04 
EW/PL 
1.42-1.56 
1.45-1.60 
1.50 
1.51 
0.05 
0.06 
Table 
1. Variation 
in a sample of 
: a population 
of Catopo 
cerus 
ulkei 
topotypes from 
the District 
of Columbia. 
10 males 
and 10 
females. Measurements in millimeters. 
VI; IX smaller than X, larger than VII; IX and X broader than 
long; XI conical. 
Pronotum widest just behind middle; sides evenly arcuate; nar- 
rower at front than back; hind angles slightly obtuse; front angles 
rounded ; front margin slightly concave ; hind margin straight ; disc 
finely and sparsely punctulate; finely striolate. 
Elytra fused ; at base slightly wider than base of pronotum ; widest 
at middle ; sides slightly curved ; narrowing in apical third ; surface 
finely punctate, some punctures vaguely indicating striae; finely 
striolate; apical declivity smooth. 
Protibia widening to apex in distal 2/3; setose on apical half of 
inner margin; mesotibia gradually widening to apex in apical 2/3; 
inner margin setose in apical third, faintly sinuous; outer margin 
spinose; outer apical angle truncate. Metatibia gradually widening 
to apex; outer margin smooth; inner margin smooth to serate; outer 
apical angle slightly truncate. 
Male first four protarsomeres dilated and supplied with long 
lateral hairs; first three mesotarsomeres feebly dilated. Aedeagus in 
lateral view arcuate; ventral surface of anterior end projecting for- 
ward and curved downward ; tip dorsoventrally flattened and turned 
downward forming 8o°-ioo° angle with ventral surface of aedeagus; 
parameres long and thin, exceeding tip of aedeagus, hinged at aedea- 
gus base to ventrally deflected elongate basal pieces (figs. 4, 5). 
