This species differs from I. canaliculatus in its smaller size, the absence of hairs on the anterior, and their paucity on the posterior portion of the body, and in the mucro being larger in proportion to the rest of the animal.
Hab. Chester County, Pennsylvania.—Dr. H. C. Wood, Jr.
I. cinerefrons.
I. brunneus, cinereo annulatus; capitis superficie antica cinerea; raucrone nullo; squama preanali triangula, baud acuminata.
Deep brown; antennæ filiform, long, pilose, clavate; scuta below deeply and closely canaliculate, above sometimes obsoletely so; segments 33; mucro none.
I. cinerefrons, Wood, Proc. Acad. Nat. Sci., 1864, p. 13.
The color of this species is dark brown. The anterior surface of the head is an obscure gray color, with a dark band. There is between the upper and anterior surface of the head a well-marked angle, almost an elevated ridge. The lower margin is fringed with a few hairs, and is emarginate and armed with a few r denticules. The triangular eyes are connected by a distinct, impressed line. On the upper portion of the anterior surface of the head are two round, light dots, surrounded by a darker tint. The antennæ are wanting in the only specimen, a female, that I have seen, which is so mutilated that I cannot say certainly of how many segments it was composed; the number, however, was probably either thirty-four or forty-five. The first scutum has very small, lateral processes. It is light brown, bordered with a dark band, edged with a grayish tint. The anterior portion of the body is of a lighter shade than the posterior, and has the grayish annuli more distinctly pronounced. The anal scutum is not mucronate. The anal scales are not pilose.
Hab. Oregon.—Smithsonian Institution.
I. Milesii.
I. saturate brunneus; antennis filiformibus, longis, pilosis, clavatis; scutis infra arete et valde, supra interdum obsolete, canaliculars; segmentis 33; mucrone nullo.
Brown, annulate with ash color; anterior surface of the head cinereous; mucro absent; preanal scale triangular, not acuminate.
I. Milesii, Wood, Proc. Acad. Nat. Sci., 1864, p. 13.
