12. 
This beetle (fig. 3) is smaller than the preceding, measuring only 
about one-sixth inch in length; is pale yellowish bro>yn in color and 
moderatel}^ variable,, some individuals being plain, while others are 
marked with black spots arranged in nearly regular series. 
It is a Western species, but ranges as far eastward as the Dakotas, 
and is found in Montana, Utah, Colorado, 
Kansas, Arizona, and the Pacific States. 
There is no record of injury by the larva, 
but there is little doubt that it also affects 
this plant, and in much the same manner 
as does that of the larger sugar-beet leaf- 
beetle. Injury has been noticed in Oregon 
toward the end of August, continuing for 
six or eight weeks. 
THE SOUTHERN CORN ROOT-WORM. 
Fig. S.—Monoxia co7isputa: beetle, 
8 times natural size; antenna at 
left highly magnified (original, 
Division of Entomology). 
{Diabrotica 12-punctata 01. ) 
As this species is present everywhere in 
beet fields the year round, it is familiar to 
most beet growers. The adult is best known 
in the North as the twelve-spotted cucumber beetle, from its partiality, 
for flowers of cucumber and related plants. In the South the young or 
larva is called the "' bud worm" from its pernicious habit of burrow- 
ing into and eating young cornstalks soon after the germinating period. 
The beetle (fig.'^i) 
measures nearly one- 
fourth of an inch in 
length, is yellowish- 
green in color, and the 
el3"tra or wing-covers 
are marked with twelve 
black spots. 
This beetle is practi- 
cally omnivorous, feed- 
ing upon almost any 
form of vegetation 
upon which it happens 
to alight. Although 
very fond of flowers, 
it is liable to ittack 
any portion of a plant, 
finding food on the 
foliage and other portions of most garden and many field crops, the 
flowers and leaves of fruit trees, and the bloom of many ornamental 
plants. The larva develops on the roots of grasses, as well as corn, 
and even on beans and some other plants. The beetles have been 
YiG. A.—Diahroiica 12-punctata: a, beetle; b, egg. c. larva: d. anal 
segment of larva; c, work of larva at base of cornstalk; /, pupa- 
all much enlarged except e. which is reduced (reengraved after 
Riley, except/ [original].. Division of Entomology). 
