This interesting division of the Neuroptera comprises a number of smaller groups, ranked by some entomologists as families, but now generally regarded as sub-families. Westwood divided them into two families, the first containing the true ant-lions; both Kirby and Sharp treat them as one, but the latter places them in seven well defined sub-families. They come naturally together from the fact that all the larvae are provided with large, curved, hollow, sucking jaws, and are carnivorous in their habits, while the perfect insects have simple biting jaws. They all have, in the perfect state, long slender bodies, provided with two pairs of finely reticulated wings, folded over each other when at rest; the head is short, with large projecting eyes; ocelli generally wanting; and the antennae are composed of many short annular joints. The MYRMELEONIDES are the true ant-lions, whose larvae in many species construct funnel shaped pits in soft sandy soil an inch or two in depth, at the bottom of which, buried in the loose soil, with only the tip of their large jaws visible, they lie in wait for any ant or other small insect that may happen to slip over the edge and tumble to the bottom, where it is immediately seized in the ant-lion’s powerful jaws and devoured; when however, as often happens, the trapped visitor manages to regain its footing and nearly succeeds in clambering out, the ant-lion presses its head downward like a spade and throws a quantity of sand right at its prey, generally bringing its quarry within reach again. It generally excavates its pit under the shelter of a log or rock so that it is protected from the rain, and when full grown pupates at the bottom of its shaft. The larva is a short thickset little brown creature covered with tufts of short stout bristles; the head is broad and rounded behind, attached to the heart-shaped body by a neck-like thorax. They are easily captured by slipping a knife blade under them and throwing them out when they are intent on catching a struggling ant. In captivity they are easily kept in a saucer full of sand, and have the power of going for weeks without food; when placed on a smooth surface they always arch their heads and crawl backwards. Most of our described species belong to the Genus _Glenurus_, all slender elongated insects resting with their long narrow wings folded over their backs against a twig or grass stem, and when disturbed flitting away in a very awkward manner; they are very easily captured.