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The Bulletin 
duration as the period of activity. These alternate periods of activity 
and relaxation seem to follow each other in fairly regular succession 
over long periods of time. I do not mean to imply by the above state¬ 
ments that there is any accurate mechanism which regulates the periods 
of relaxation with those of activity, but repeated observations showed 
that it took a much more violent stimulus to cause activity in a pupa 
that had recently relaxed than it did in a pupa that had been relaxed 
for some time. And apparently the longer the period of relaxation, 
the smaller the stimulus required to produce activity. 
4 5 6 7 8 9 101112 
Figure 58. Curve to show duration of pupal stage. Dotted line (....) 
females. Dashed line (-) males. Solid line (-) totals. 
DESCRIPTION OF THE ADULT 
The following description of the adult is summarized from Blatcliley 
and Leng (1916), our most recent authorities on this group: 
Tibite all broadly rounded at outer apical angle. Third joint of 
hind tarsi feebly dilated. Third joint of other tarsi not dilated, entirely 
glabrous beneath. Elytral intervals all flat, no single one of them in 
part or wholly distinctly elevated above the others. Beak curved, 
slender. Front tibhe straight. Thorax with distinct smooth spaces. 
Median thoracic smooth area dilated at middle. Surface densely coated. 
Oval robust. Black, densely clothed with a brownish or olivaceous 
clayey coating; antennas and tarsi reddish-brown. Beak two-thirds the 
