LIFE HISTORY AND CONTROL OF HOP FLEA-BEETLE, 37 
the soil, however, until the head, thorax, and elytra have colored, 
which requires from 12 to 14 hours. The beetle is then of a dull 
blue-black color, but 
after it has been in 
the sunlight for a few 
days it becomes quite 
bronzy in appearance. 
THE ADULT. 
The adult is a dark, 
smooth, bronzy-black 
beetle of the family 
Chrysomelidxe, —one- 
twelfth to one-tenth 
of an inch (1.5 to 2.5 
mm.) long and about 
half as wide. The 
male and female are Fic. 10.—The hop flea-beetle: Adult beetles, showing 
alike in general ap- relative sizes of female and male. The male has the 
wing covers slightly spread. Much enlarged. (Original.) 
pearance except as to 
size, the male being distinctly smaller than the female (see fig. 10). 
The hind thighs, by means of which the beetle jumps, are strongly 
developed, hence the 
name “ flea-beetle.” 
The specific name 
punctulata refers to 
the punctulate or 
pitted condition of 
the head, thorax, 
and elytra. This 
beetle should not be 
confused with L'p- 
trix subcrinita Lec., 
sometimes collected 
with the hop flea- 
beetle on potatoes, 
which, although 
much like Ps. punc- 
= tulata im general 
Fig. 11.—The hop fiea-beetle : Ovipositor of female. Highly appearance and in 
magnified. (Original.) 
the possession of the 
punctulate condition of the thorax and elytra, is smaller and is 
covered with hairs. 
32199—Bull. 82, pt. 4—10 2 
