“Tumble-bugs” have been interesting to human beings for centuries. As these chubby insects roll their balls across paths, roads, and walks, persons stop to puzzle, and whether country boys, soldiers, golfers, or scientists, all are fascinated by the ball-rolling habit of these creatures.

Described from a series of specimens.

Holotype deposited in my own collection.

Paratypes in various institutional collections.

Adult Female: In Life:—Enclosed in a tough, brownish-white, felted, elongate sac, on the underside of the leaves of Hystrix patula Moench and on several other undetermined species of grasses. Living insects removed from sacs are dark red, retaining that color in KOH.

Female. Length. 9.6 mm.

Head. Frontoclypeus and cheeks grayish white pollinose with rather long white hairs which are quite dense below; a small area in center of frontoclypeus denuded; also two very small denuded areas on the lower portion of each cheek; front above antennae grayish white pollinose shading to yellowish brown toward the vertex; front and vertex with many long black hairs. Frontal callosity brownish black and somewhat shining; about one half width of front.

In the course of my studies in this interesting genus I have gradually accumulated a few specimens of a species which on genitalic characters (both ♂ and ♀ ) is abundantly distinct from any of our other eastern species. As these genitalic characters of practically all the described species are known to me, due to a study of type material, I believe the present species to be undescribed and offer the following description.

Male: Length of body (dried) 5 mm., of the forewings 1.8 mm., of the hindwings 1.5 mm. Color of body black, the abdomen with a mid-dorsal brown line; legs dark brown.