appendages (Fig. 43) are moderate. They have a small falciform spinule placed close to their side. The terminal spine springs from a knob-like portion, which is quite hairy and regularly curved. Its margin is irregularly notched near its middle, and its distal portion is curiously fringed. The female appendages (Fig. 44) consist of a pair of bodies shaped somewhat like the crest of a helmet. Along their free margin is an opening surmounted by a double series of teeth-like processes. I think a careful examination will convince any one that M. Saussure (loc. cit) has described this species, under the name of P. serratus, thinking it was the one indicated by Mr. Say.
Length 1½ inches.
Hab. Pennsylvania, New Jersey, Illinois, &c.
P. cerasinus.
P. dilute cerasinus; dorso complanato; antennis modice pubescentibus, nonnihil clavatis, nonnihil brevibus; scutis squamis obsoletis ornatis, marginibus lateralibus serratis; appendicibus masculis spina terminate lata, oblique truncata, utrinque processu longo setaceo curvato instructa. (Fig. 45.)
Light-cherry red; dorsum complanate; antennæ moderately pubescent, somewhat clavate, rather short; scuta ornamented with obsolete squamaæ, their lateral margins serrate; terminal spine of the male appendages broad, obliquely truncate, furnished on each side with a long, curved, setaceous process.
P. cerasinus, Wood, Proc. Acad. Nat. Sci., 1864, p. 8.
Fig. 45.
The head has the median furrow on its vertex illy pronounced. The anterior face is
sparsely pilose, and has its lower margin broadly but shallowly emarginate. The scuta
have a double row of scales, obsolete, but otherwise similar to those of the following species; sometimes these are entirely lost. The lateral margins
of the side plates are rounded slightly and minutely serrulate. They seldom
have more than three serratures on each side. The terminal scutum is triangular, with its obtuse apex bent downwards. It is sparsely pilose. The legs
are quite hairy and light-colored. Their second joint is tumid. The appendages (Fig. 45) in the male are peculiar. The terminal spines are broad and
short, and superiorly very obliquely truncated, with two small hamular processes. On
each side a long, seta-like process springs from the base. The outer, much the longer of
the two, throws an arch entirely over the short spines. The inner is straighter. They
both have one or two thorn-like excrescences.
Hab. Oregon.—Museum of Smithsonian Institution.
vol. xii—28
