EXPLANATION OF PLATES. 
Figures 1, 2, 3, 4, 5, 14, 17, 18, 19 and 22 were made with the aid of a 
compound microscope and a camera lucida. Figures 17, 18 and 19 were 
made from balsam mounts with transmitted light, while the others were 
made with reflected light. Figures 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 20 
and 21 are from sketches, made from nature. Figures 23- 29 were 
photographed from nature with a micro-tessar lens. “All drawings and 
photographs were made by the author. 
PLATE I. 
Fig. 1. Adult male of Pityogenes hopkinsi Swaine showing the gen- 
eral appearance of the adult male. Especial attention is called to the 
rugosities on the prothorax and to the spines on the elytra. Magnified 
50 dia. from a specimen exactly 2 mm. in length. 
Fig. 2. Adult female of P. hopkinsi Swaine. Note the difference in 
the general shape and in the proportions of the various parts. ‘Lhe 
difference in the spines in the region of the elytral declivity is a 
secondary sexual characteristic of this species. Magnified 50 dia 
from a specimen 2.164 mm. in length. There is considerable variation 
in the size of the adults and this is especially true of the females. 
‘Specimens varying from 1.568 mm. to 2.18 mm. have been measured. 
The males appear to vary within much smaller limits. 
