OCR Text |
Show 400 REV. O. P. CAMBRIDGE ON [June 1, however, are destitute of the single characteristic tooth on the inner side of their front surface ; and (in spirits of wine) the abdomen is pretty distinctly marked with various lines and mottlings of dull yellow, very faintly indicated in the male ; the sexual aperture is furnished with a short prominent process of a characteristic form, impossible to describe clearly, and not easy to delineate certainly; fig. 6 d is an attempt to represent its appearance slightly in perspective. This species is allied to E. livida, Bl., as well as to E. subtilis (Cambr.) and others, but cannot be confused with them if the profile of the cephalothorax, the armature of the falces, and the form of the radial joint of the palpus and the palpal organs be carefullv observed. An adult of each sex was received from Mr. Emerton, by whom they were found under a stone, below high-water mark, at Peaks Island, Boston, Massachusetts, U. S. A., in August 1873. ERIGONE PERSOLUTA, sp. n. (Plate XLVI. fig. 7.) Adult male, length rather over 1 line. The cephalothorax, falces, and maxillae of this Spider are of a yellow-brown colour, the margins of the cephalothorax being blackish ; the legs and palpi (except the digital joints of the latter, which are yellow-brown) are of a dull orange-yellow colour; the labium and sternum are suffused with blackish brown; and the abdomen is dull black, with a strong olive-green tinge, marked (in spirits of wine) with fine pale spots and lines. The form of the cephalothorax is of the ordinary type ; looked at in profile, the line from the foremost eyes to the thoracic junction is a gentle curve with a very slight hollow at the occiput; the height of the clypeus, which is a little prominent at its lower margin, rather exceeds half that of the facial space. The eyes are of tolerable size, and in the usual position, on black spots, but rather closely grouped together; those of the front row are very nearly contiguous to each other ; those of the hind central pair are separated by an interval not quite equal to an eye's diameter, and each is separated from the hind lateral eye on its side by an interval rather less than that which divides those of the hind central pair ; those of each lateral pair are obliquely placed, contiguous to each other, and apparently the largest of the eight; each of the fore centrals is separated from the hind central eye nearest to it by a space equal to its own diameter. The legs are of tolerable length and strength, their relative length being 4, 1, 2, 3; they are furnished with hairs, bristles, and a few fine spines. The palpi are not very long, the radial and cubital joints very short, the former being the strongest; it is largest at its fore extremity, but has no apophysis ; and among other, finer hairs it has several longer and stronger bristly ones issuing from its fore extremity, near the outer side ; the cubital joint has a single slightly sinuous bristle at its fore extremity, a little towards the outer side ; the digital joint |