COLEOSOMA.—AMAMRA. 155: 
The abdomen joins the thorax in a strong sheath-like pedicle, whose fore extremity above is deepiy iotched ; 
the abdomen proper is elongate and divided into two parts by a very strong transverse constriction, the 
anterior portion largest, but the posterior part very abrupt and rounded at its extremity; the pedicle is 
yellow in colour underneath; the whole of the rest of the abdomen is black, with the constriction 
paler; it has a few granulations on its surface, and is thinly clothed with long, pale, rather bristly hairs ; 
the spinners are very short, equal in length, and compact. 
Hab. Mexico, Teapa in Tabasco (H. H. Smith); Guatemata, Coban (Sarg). 
AMAMRA, Cambridge. 
Amamra nigro-maculata, sp. n. 
Adult female, length (from the fore extremity to the point of the superior prominence of the abdomen) 4 lines, 
to the spinners 3 lines. . 
Cephalothorax oval, longer than broad, a little drawn out and obtuse in front, and the thoracic region some- 
what raised ; the lateral marginal impressions at the caput not strong ; the area of the four central eyes not 
raised, but a little prominent. It is dull yellowish in colour, thickly clothed (like the whole of the spider) 
with hairs and whitish pubescence; at the hinder extremity of the caput is a strong whitish Y-shaped 
marking. The height of the clypeus is less than half of that of the facial space. 
The eyes of the central group form a small quadrangle longer than broad, and its posterior side shortest. The 
eyes of each lateral pair are in a line parallel with the lower lateral margin of the caput, seated on 
tubercles, and separated from each other by about half a diameter. The hind-central eyes are largest of 
the eight, seated on black spots, and rather more than an eye’s diameter apart. In the middle of the 
quadrangle is a strong obtuse prominence surrounded by two yellow-brown, spine-like, prominent bristles 
in a transverse line. 
The legs are tolerably long and strong, 1, 2, 4, 3, armed with short strong spines ; similar to the cephalothorax 
in colour, the femora of the first, second, and fourth pairs marked at the fore extremity with black ; 
the greater part of the genua of the first and second pairs also black, and at the middle of the femora 
of the second and third pairs is a blackish suffused indistinct annulus; the metatarsi and tarsi of the 
third pair are also indistinctly but broadly annulated with yellow-brown. 
The falces are long, powerful, straight, vertical, slightly prominent near the base in front, and like the cephalo- 
thorax in colour. 
The maville, labium, and sternum are pale yellowish like the cephalothorax. 
The abdomen is of moderate size, of a heart-shape, the fore extremity transversely straight, and the shoulders 
also straight, whence on each side it curves to a point in a prominent tubercle at its posterior extremity ; 
beneath this tubercle is another less strong, about one third of the distance to the spinners, which 
this part of the abdomen overhangs. The upper surface of the abdomen is somewhat flattened and of a 
pale whitish cream-colour, with three longitudinal rows of black irregular spots or markings: the central 
one begins at the anterior extremity, the lateral ones near the somewhat angular shoulders, consisting of 
only three spots each, and converging towards the hinder extremity of the central row; there are also 
a few minute black points at the fore extremity of the abdomen. The underside is dusky, thickly marked 
with minute whitish points. The spinners short and compact, the anal tubercle closely grouped with 
them, subconical, and distinctly composed of three segments. The genital aperture is of characteristic 
form, and has a recurved, flat-sided epigyne connected with it. 
Hab. Mexico, T eapa in Tabasco (H. H. Smith). 
‘Found spinning a perpendicular geometric web on the branches of a dead tree at 
nightfall in the open square in the village.” 
xt 2 
