larva takes place in May, the beetles issuing in June. Its length of 
larval life is not known, nor the precise time or place of oviposition. — 
The following description of the larva is taken from Dr. Riley.* 
“Full grown larva—Length 40 millimetres, somewhat largest pos- 
teriorly, subeylindrical, broader at thorax and eighth and ninth abdomi- 
nal segments, which are materially swollen. More flattened ventrally, 
with a distinct swollen lateral ridge just below the stigmata, which 
rather increases the flattened aspect of the venter. General color, 
glassy yellowish white, inclining to green or blue towards the extremity. 
Head, rather small, flattened, well inserted into the prothoracic seg- 
ment, chestnut-brown in color. Dorsal surface of the body strongly 
transversely corrugate or wrinkled, each of the chief segments having 
three distinct ridges, the whole body studded with short, thick, yellow- 
ish bristles, which are most dense on the dorsal ridges and more sparse, 
but longer, on the ventral and anal segments. Dorsally these stiff hairs 
are directed posteriorly and materially assist in the dorsal locomotion. 
The legs are honey-yellow, covered with similar stiff bristles, without 
definite tarsal claw. They are short, compared with the larve of Lach- 
nosterna generally. Prothoracic segment with a honey-yellow horny 
plate in front of the spiracle, w hich, as usual, is rather larger than the 
abdominal spiracles. Mandibles short, stout, dark brown, with the 
left (looking from the dorsum) 4 dentate, and the right 3- -dentate. An- 
tenne short, 4-jointed, joints subequal in length, diminishing in width 
from 1 to 4, maxillary palpi 3-jointed, joints subequal in length, ter- 
minal narrowest at tip. Labial palpi 2-jointed, jot 1 longest, some- 
what swollen at tip, and bearing a short pointed joimt 2 on the inner 
side of its tip. Labium covered with short stout bristles. Maxille with 
long, stiff bristles on the inner surface, and with two long, sharp, black 
teeth near the tip. 
“The half-grown larva does not differ in structure or coloration.” 
PRIONUS. 
(Plate XHI., Fig. 3-6.) 
The occasional occurrence in corn of large thick-bodied grubs be- 
longing to a different family from the common white grubs of this ar- 
ticle, calls merely for general mention. The larve in question are those — 
of two species of large brown, flattish, long-horned beetles (Ceramby- 
cide), and belong to the genus Prionus (P. imbricornis and P. laticol- 
lis). They are sometimes common in prairie or pasture sod, where they 
feed upon the roots of grass, and have also been a few times reported 
in corn fields in Hlinois and Missouri, doing an injury apparently iden- 
tical with that of the white grubs. These larve are at once distinguish- 
able from the latter insects by their greater size (3 mm. in length and 
nearly half as thick when full grown), by the form of the body (taper- 
ing from the head backwards), and by the fact that it is little, if at 
all, curved. They are, further, at once distinguishable by the rudimen- 
tary and inconspicuous character of their legs. They are much more 
generally known to economic entomology for their injuries to the roots 
of the vine and apple and some forest trees than for their agricultural 
relations. 
* Bull. 28 Mad. Agr. Exper. Station, 1893, p. $0. 
qh Fe er as 
7 ah, 
> 
