inner basal piece, alluded to, there exists a large, strongly-curved, acute hook or claw, whose distal extremity is subcylindrical. The female appendages are small, and are composed on each side of a very thin plate and a process about a line in length, proximally irregularly prismatic in shape; but distally excavated suddenly, so as to be flattened for the remainder of its course.
Hab. California.—Smithsonian Institution.
S. niger, lateribuslminneo maculatis j capitis superficie antica angusta, longa, supra nigra, infra albido-brunnea; antennis ?; segmentis 75 5 scutis et infra et supra distincte canaliculars; squama anali triangula.
Black, with the sides maculate with brown; anterior surface of the head narrow, long, above black, below whitish brown; antennæ ? 3 segments 75 3 scuta both above and below distinctly canaliculate; anal scale triangular.
S. angusticeps, Wood, Proc. Acad. Nat. Sci., 1864, p. 16.
Fig. 37.Fig 37 a.
The color of this species is black, with a brown band on the sides, in which is a black
dot marking the position of the lateral pores. The lower portion of the head is very
light-brown, and is rather deeply emarginate. Along the posterior cephalic border is a
somewhat crescentic area, which is nearly smooth and is medianly canaliculate; adjoining
this the surface suddenly is rudely punctate, but gradually becomes smoother. The eyes
are arranged in three transverse rows, the posterior being much the longer. The first
scutum is copiously coarsely punctate, and is posteriorly slightly canaliculate on the dorsum, but distinctly so on the sides. The lateral processes, even in the female, are obsolete,
the second scutum being produced forwards so as to abut on the head. The posterior
subscuta are on the dorsum closely, rather deeply, and more or less obliquely canaliculate, but on the sides less distinctly and more distantly so. The anterior subscuta
are very distantly and much more lightly and obliquely canaliculate, and are also more closely channelled below than above. The surface of the anal scutum is irregularly and minutely corrugate. I have seen but one imperfect specimen—a female. The female (Fig. 37) appendages appear
to consist of two conoidal bodies coalescing at their
bases and united together towards their apices by
a broad plate, so placed as to present towards them an inclined surface. Into the base
of these pyramidal processes fit other somewhat prismatic bodies (Fig. 37 a), with their thin
edge formed of several pieces. Length, 4½ inches.
Hab. San Francisco.—Smithsonian Institution.—E. D. Cutts.
