26 
THE IMMACULATE BLISTER BEETLE. 
{Macrohasis immaculata Say.) 
As with some of the following species, this insect, although com- 
mon, has not been much studied; but we know of its having injured 
beets in Kansas as early as 1897, and during 1902 it was destructive 
to sugar beet in Colorado. Among other food plants are potato, tomato, 
and cabbage. It is one of our largest blister beetles, and is gray or 
yellow in color. 
THE TWO-SPOTTED BLISTER BEETLE. 
{Macrobasis albida Say.) 
During 1902 this blister beetle was destructive in Indian Territory, 
in one case devouring a field of 
sugar beets in a single day. Al- 
though an extremely common spe- 
cies from Kansas to Texas and 
New Mexico, little has been pub- 
lished in regard to its habits until 
very recentl}^ Like others of its 
kind it favors vegetable crops, 
which include tomato, potato, and 
some others. It is evidently an 
old beet enemy, as we have record 
/T5^^;^5sp' / o^ its being ver}^ injurious to this 
^ crop in Kansas a decade earlier 
\ than the case^ reported. 
It This is als6-a larg'e species (fig. 
21), gray or 3^ellowish in color, 
with the thorax marked with two 
nearly parallel lines. It measures 
about an inch or an inch and a half in length. 
Pig 
21. — Maa-obasis albida: twice natural size 
(original, Division of Entomology). 
THE SEGMENTED BLACK BLISTER BEETLE. 
{Macrobasis segmentata Say. ) 
Injur}^ b}^ this blister beetle to beets was reported to this office in 
1897, when a considerable proportion of crops of beets, as well as 
potato, tomato, and cabbage, was being destroyed in Kansas, the beetles 
being described as coming in large swarms, settling down in fields, 
and devouring and ruining crops in a few hours. It is one of the 
larger species of the group, sometimes attaining a length of about an 
inch. It is of robust form, uniformly dull black, except for an occa- 
sional narrow fringe of cinereous hairs on the base or apex of the 
thorax. Its range extends from Kansas well into Mexico. 
