I. Hortensis.
I. brunneus, lateribus maculis nigris ornatis; antennis modice brevibus, pilosis, filiformibus, clavatis; segmentis 42; scutis arete canaliculars et infra et supra; mucrone nullo; squama preanali triangula, apice rotundato.
Brown, ornamented with black spots on the sides; antennæ rather short, pilose, filiform, clavate; segments 42; scuta closely canaliculate both above and below; mucro absent; preanal scale triangular, with its apex rounded.
I. Hortensis, Wood, Proc. A. N. S., 1864, p. 14.
The general color of this species is rather dark brown in the adult. When an individual is examined with a magnifier, it is seen to be beautifully areolated with light brown. In young specimens and adults, which have recently shed their exuviæ, the color often verges on white, whilst the side spots are black, contrasting strongly with the general tint. The head is rather broad inferiorly, and has its lower margin shallowly emarginate, and distinctly, though minutely, denticulate. The triangular eyes are connected by a broad, dark band. The first scutum is ornamented on its anterior portion by a dark, transverse band. The lateral processes are almost wanting, even in the female. There is on each side a series of large, black dots, one to a scutum, commencing rather abruptly at about the fifth or sixth segment, and ending in the same way at about the thirty-ninth. The subscuta on which they are situated are scarcely canaliculate. The anal scutum is about equal in length to the two preceding it. Length, i to 1 inch.
Hab. Philadelphia,— Dr. H. C. Wood, Jr.
I. virgatus.
I. saturate brunneus; dorso luteolo, medio linea nigra instructo; antennis modice longis, pilosis, clavatis; segmentis 35; scutis copiose distincte canaliculars; mucrone subnullo; squamis analibus sparse pilosis; squama preanali lata, subtriangula, apice rotundato.
Deep brown; dorsum yellowish, furnished with a median black line; . antennse moderately long, pilose, clavate; segments 35; scuta copiously distinctly canaliculate; mucro almost wanting; anal scales sparsely pilose; preanal scale broad, subtriangular, with rounded apex.
I. virgatus, Wood, Proc. Acad. Nat. Sci., 1864, p. 14.
The sides of the body are deep brown, almost black, whilst the dorsum approaches a yellowish fawn color, and has a strongly pronounced, black median line. The lower margin of the head is broadly emarginate, denticulate, and fringed with a series of hairs. The anterior surface is mottled with light brown, and has a dark median band, terminating in a transverse one low down. The under surface of the body is light-colored, and is often somewhat areolated. There are some specimens whose pattern of coloration is light brown or fawn colored, with two lateral and one median dark stripe. Are these
