cies? I have examined the types of Reasia spinosa, and there can be no doubt as to its identity.
I have seen a single specimen, a female, labelled as coming from New Grenada, which apparently belongs to this species.
Hab. Eastern United States.
S. cæsioannulatus.
S. brunneus, cæsioannulatus; segmentis 32, singulo serie punctorum distantum ornato.
S. brown, annulate with gray; segments 32, each with a series of distant puncta.
The general color of this curious Myriapod is light brown, but on each scutum is a broad gray annulus. The anterior surface of the head is hollowed out at the position of the ocelli; in front of these the sides are straight and converging. The inferior margin is rather deeply emarginate. The basal portion of the mandibles on each side project, so that if a vertical section of the head through the middle were taken it would be an oval with its greater diameter transverse. The eyes are in strictly triangular patches, with remarkably straight sides. The scuta are so deeply canaliculate along their dorsal centre as to be almost divided into two parts. The dorsum is not perfectly rounded, but there is somewhat of a ridge or angle in the centre. Each scutum is furnished with a regular series of distant large puncta, or perhaps more properly, pores. Three cylindrical, transparent spinules, project from the posterior border of the last scutum. There is a single specimen, a female, in the Smithsonian Museum,—it measures about an inch in length, and was found by Mr. Robert J. Walker in Alleghany County, Pennsylvania. This species ought perhaps to be the type of a new genus; but, as I am unable to make out the generic characters in this family, it seems preferable to retain it in this for the present.
Fam. II. IULIDÆ.
Subsegmentorum posticorum sterna subnulla, subsegmentorum anticorum sterna modica et ilia et haec cum scutis arete conjuncta. Scuta laminis lateralibus haud instructa.
Sterna of the posterior subsegments almost absent, of the anterior moderate, both closely conjoined with the scuta. Scuta not furnished with lateral lamina.
The head in this family is moderately large, and generally has the organs of special sense well developed. The eyes are present in all our American species, arranged in variously shaped patches, near to the base of the antennæ. The latter are sometimes
