135 
; “Length about .56 inch, diameter about .06 inch. Examples ready 
— for pupation about .37 inch long.” 
Pupa (Plate XIV., Fig. 2 and 3).—*Translucent white, with scat- 
tered brown hairs on dorsal side of body arranged as follows: One 
within, and a pair posterior to, the base of each antenna; a transverse, 
arched row near the anterior edge, a pair near the middle, one at the 
middle of each side, and one at each side, near the posterior margin, 
of the prothorax; four each on the meso- and meta-thorax; three at 
the extremity of each femur; a pair at the middle and one at each side 
of each abdominal segment, except the posterior three; antepenultimate 
and penultimate segments of abdomen each with six, the four inner 
being in pairs and posterior to the others; two within, and three with- 
1 
ter 
thy 
4 
4 
Pe te 
pa sie kod 
f 
2 out each of the large spines borne on the posterior segment. Caudal 
: spines straight or curved, black-tipped. Wing-pads covering the pos- 
terior femora below. Antenne curving around the femora of the two 
e: anterior pairs of legs and then extending inwards towards the ventral 
middle line. 
| “Length .22—.25 inch.” 
: Imago (Plate XIV., Fig. 1).—“Pale green, or greenish yellow, 
marked with black. Head and mouth-parts black, the former showing a 
brownish cast medially on ventral side. Three basal articles of each 
antenna pale, sometimes with dusky dots on posterior side; remainder 
of antenne black. Prothorax uniformly green or yellow. Elytra green 
or yellow, with twelve large black spots, six on each, arranged in three 
cross series: the first series at the base, the second at about the mid- 
dle, and the third midway between the second and the tips of the elytra. 
Scutellum brown or black. Mesothorax beneath the cox, the basal 
third to half of femora, and the abdomen, yellow or green. Metathorax 
beneath, the distal portion of the femora, and the whole of the tibize 
and tarsi, black. 
“Head with a basal pit behind antenne. Prothorax above smooth 
and shining, obsoletely punctulate, with a pair of pits, one on each side 
of the middle line. Margin of prothorax sinuate at sides, no promi- 
nent angles. Elytra minutely, regularly punctulate, each elvtron with a 
humeral prominence. Antenne, metathorax beneath, abdomen, and 
legs, clothed with a fine silken pubescence. 
Length .25—.28 inch; antenne about .19 inch.” 
bY in 
e. Roots visibly penetrated and perforated scarcely at all; sometimes 
decayed at tips, but not eaten away. Principal injury interior, 
in form of minute burrows which are commonly longitudinal. 
THE NORTHERN CORN ROOT WORM. 
(Diabrotica longicornis, Say.) 
(Plate XIV., Fig. 6-8; and Plate XV.) 
The northern or common corn root worm (Diabrotica longicornis) 
is by far the most destructive corn root insect dependent on that plant 
_ alone. Indeed, it now seems likely that if it were not for the fact that it 
is highly susceptible to a measure of prevention which farmers have very 
| generally taken unconsciously, as a part of a sound agricultural routine, 
= —10 E 
