COLEOPTERA. 551 
are sluggish by day. On the other hand, a few species are 
very active in the brightest sunshine. 
The most common of these day-fliers are the soldier- 
beetles, Chauliognathus (Chaul-i-og'na-thus). These are very 
abundant in late summer and autumn on various flowers, but 
especially on those of the goldenrod. There are two very 
common species: the Pennsylvania Soldier-beetle, Chauliog - 
nathuspennsylvanicus (C. penn-syl-van'i-cus), which is yellow, 
with a black spot in the middle of the prothorax and one 
near the tip of each wing-cover (Fig. 666) ; and the Margined 
Fig. 666 . 
Fig. 668. 
Soldier-beetle, C\ marginatus (C. mar-gi-na'tus). This species 
(Fig. 667) may be distinguished from the former by the head 
and lower part of the thighs being orange. The beetles 
of this genus are remarkable for having an extensible, 
fleshy filament attached to each maxilla. These filaments 
are probably used in collecting pollen and nectar from 
flowers. 
Another common diurnal Lampyrid is Calopteron reticu - 
latum (Ca-lop'te-ron re-tic-u-la'tum) (Fig. 668). This species 
represents a group in which the wing-covers are covered with 
a network of fine elevated lines. These insects are found on 
the leaves of plants, where they seek and feed upon other 
insects. 
The true Fireflies are nocturnal, and are furnished with 
a light-giving apparatus, which is situated on the lower side 
of the abdomen ; the exact position of these organs differs 
in different genera. Figure 665 represents a common species. 
