THE PARSLEY STALK WEEVIL. 
15 
DESCRIPTION. 
The beetle is a weevil of the family Curculionidse. It is of some- 
what obscure appearance, there being many other species which 
resemble it superficially. It is shown in the illustration (fig. 3, a). 
Its resemblance to the clover-leaf weevil and related species (Phyto- 
nomus) is apparent. The two genera are intimately related. From 
the latter genus Listronotus may be distinguished by the different 
proportions of the ventral segments, the first, second, and fifth being 
long, and the third and fourth very short. The legs are more slender, 
and the tibiae are bent inward at the tips and are quite strongly 
mucronate. The species, so far as known, are winged. Twenty- two 
species are indicated by Horn. L. latiusculus Boh. is very closely 
related to L. impressifrons Lee. Le Conte describes the two species as 
agreeing in form and sculpture and in having the last ventral segment 
of the female not impressed, but in latiusculus the rostrum or snout 
is feebly channeled and sulcate with the frontal fovea faintly indi- 
cated, while in impres- 
sifrons the rostrum is 
strongly channeled 
and sulcate with the 
frontal fovea deep. 
The length without 
the rostrum is about 
one-fourth of an inch 
(6-7.5 mm.). The 
color is brown, varied 
with rather minute 
golden or cupreous 
scales, with which the entire surface is covered. The rostrum from 
the eyes to the tip is of nearly the same length as the thorax. 
The egg. — The egg is variably oval, from about two-thirds to three- 
fourths as wide as long, not visibly flattened, and without apparent 
sculpture. The only eggs examined were of a decidedly dusky hue, 
but when freshly laid they were probably pale gray or whitish 
and subtranslucent. Their length is 0.70-0.75 mm., and the width 
0.48-0.55 mm. 
The larva (fig. 3, b, c). — The larva differs from those of the ordi- 
nary Curculionid form in being less curved. It is considerably flat- 
tened and crawls easily, being comparatively active. The larva in 
the cut is shown in the position assumed after death. When alive 
and stretched at full length it is a trifle longer than the beetle. It is 
of the usual milk-white color so common in curculio larvae, and has 
the same pale, reddish-brown head and darker mouth-parts. The 
Fig. 3.— Listronotus latiusculus: a, Beetle; b, larva from side; c, two 
abdominal segments from above; d, pupa. All much enlarged. 
(Original.) 
a Rhynchophora of America North of Mexico, 1876, pp. 127-136. 
