Journal of Agricultural Research 
Vol. IX, No. i 
18 
In Montana injury has been reported, and specimens have been received 
in material from the following towns: Arlee, Ronan, Twin Bridges, Brady, 
and Seventynine. This covers pretty well the whole western portion of 
the State, though perhaps the most severe damage has been done at 
Arlee. Most of the material for this work was collected there. 
HOST PLANTS 
Specimens of C. femoralis were found in or reared from winter wheat, 
spring wheat, oats (Avena sativa ), and timothy (Phleum pratense). The 
latter was found growing abundantly along the ditches and fences sur¬ 
rounding the field. Volunteer wheat and oats were also found to be 
infested during the latter part of September. As this insect has been 
found only in plants belonging to the Graminae, it appears that native 
grasses may be its natural host plant. 
DESCRIPTIONS OF THE LIFE STAGES 
EGG 
The egg is ellipsoidal, white, soft, smooth, translucent, glistening, 0.5 
mm. long, and from 0.15 to 0.2 mm. broad. 
larva 
The larva is white tinged with green, excepting for the blackish or 
brownish alimentary canal, which shows through the body wall. It is 
about 3.0 mm. long and 0.5 mm. in diameter when full grown. There 
are 13 segments. The mouth parts are indistinct, but are represented 
by black, chitinous hooks. There are two tubercles on the median line 
at the anterior end on the ventral surface, one each on the second and 
third segments. The first three and the last segments are short, the rest 
being of equal length, are slightly wider than long. The oral opening is 
found on the ventral side of the first segment and the anal opening on 
the ventral side of the last segment. 
There are two pairs of respiratory organs, or breathing appendages, 
one at each end of the body. They are similar in structure, and those 
on the same side are connected by a tracheal tube, which is visible through 
the larval skin as a fine, white thread. Each appendage consists of a 
main stalk which branches into five smaller stalks, at almost right angles. 
'Each of these small stalks has from one to three openings, the total 
number varying from 8 to n. 
The anterior segment of the body bears a patch of short black spines, 
placed just above the mouth hooks. 
PUPARIUM AND PUPA 
The puparium is moderately chitinized, brownish, semitransparent, 
3.0 mm. long and 1.25 mm. broad in the middle, slightly tapering toward 
the ends and somewhat flattened dorsoventrally. There are 10 plainly 
visible segments, the anterior and posterior ones being hemispherical. 
