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The species of this genus are typical members of the family Elateridae: the body of the adult is about 7-10 mm (0.27-0.29 inch) long, narrow, flat, and brown to black in color. The larvae are thin and long (up to 30 mm; 1.18 inch), and they have an uncommonly hard yellow to light-brown body.

The adult is brownish-gray in color; the wingspan is about 35-50 mm (1.36-1.97 inch), with typical dagger-like marks on the wings. The larvae are dirty-gray, with a brown head.

argillacea is a tropical species, native to South America und Central America. It cannot survive the winter in temperate climates. The adults are good fliers and migrate each spring in large numbers from the cotton-growing areas of Brazil northwards, sometimes as far as southern Canada. The adult moth has light brown wings that span about 25 mm (0.97 inch). The caterpillars are up to 40 mm (1.57 inch) long, green or brownish with black and white stripes. They have a characteristic pattern of black dots on each segment.

The adult (7-11 mm; 0.27-0.43 inch in length) is a little larger than a housefly and yellowish-brown in color. The female has a very noticeable ovipositor. The larvae are white maggots, up to 12 mm (0.47 inch) in length.

A typical curculionid (snout beetle), with its prolonged head and geniculate antennae. The adult is about 6 mm (0.24 inch) long, brownish in color and covered with fine gray hairs.

The adult beetle is 3.5 - 5 mm (0.14 - 0.19 inch) long, brown, and coated all over with fine gray scales. It has a very long rostrum of about 1/3 the body length.

Both adults and larvae of this species are extremely variable in coloration. Most caterpillars are green, but some are brown or black, and they have distinct lengthwise stripes in yellowish white or pink. They can become nearly 50 mm (1.97 inch) long and are remarkably active. Young instars are sometimes misidentified as soybean loopers (Pseudoplusia includens). The adult has a wingspan of up to 40 mm (1.57 inch); its color is gray to light brown. The wings may be nearly without markings or can be heavily speckled; other individuals show a dark band on the wings.

The adult female has a round, slightly convex, leathery covering, 1-2 mm (0.039 - 0.079 inch) in diameter, with a central tip. It is semi-transparent, with a reddish-brown color. The insect itself, which is normally hidden, is light orange-yellow.
Males develop under an oval cover, about 1-1.3 mm (0.039 - 0.05 inch) in length, which is smaller and paler than that of the females. When mature, the males are 0.8-1.2 mm (0.03 - 0.046 inch) in length, yellowish, and have a delicate pair of wings.

Annual, seed-propagated weed, forms a dense ground cover. English: Common blackjack, Spanish needle; German: Behaarter Zweizahn; French: Bident poilu

Kidney-shaped and shallowly notched. Up to 1.5 m (59.05 inch) tall, herbaceous, branching, erect, reddish-purple below, greenish-red above, glabrous, from large thickened taproot to +10 cm (+3.93 inch) in diameter.