340 REV. O. p. CAMBRIDGE ON SPIDERS [ApV. 20) 



hinder part of each side, leaving a broad silvery band from the apex 

 to the spinners. 



Examples, for the most part much damaged, were found iu Prof. 

 Traill's Amazons collection in company with those of A. ohtusa. 



Argyrodes infelix, sp. n. (Plate XXX. fig. 18.) 



Adult female, length to the spinners 1+ line, and to the apex 

 of the abdomen very nearly 2 lines. 



The cep/ialothorax is of a very flattened convex form above ; the 

 ocular area is a little elevated, and the clypeus (which in height is 

 no more than half that of the facial space) is rather prominent ; the 

 profile line of both the caput and thorax is very level, and forms 

 but a very slight curve ; the ordinary lateral converging indentations 

 are obsolete, and the thoracic indentation is but very slightly marked. 

 The surface of the whole is roughened or granulose, covered with 

 small impressed points, and clothed with pale coarse hairs ; its colour 

 is yellow-brown. 



The eijes are in the ordinary position ; the four centrals form a 

 square, those of the hind central pair are slightly closer to each 

 otlier than eacii is to the hind lateral eye on its side, while the in- 

 tervals between those of the anterior row appeared to be equal to 

 each other. 



The falces, maxilla;, labium, and sternum are of normal form, and 

 similar to the cephalothorax in colour. 



The legs are moderately long, slender, 1, 2, 4, 3, rather paler in 

 hue than the cephalothorax, and clothed with rather long coarse 

 hairs. 



The 2^al2n are short and slender ; they resemble the legs in colour, 

 are similar in their armature, and terminate with a curved claw. 



The abdomen has its posterior extremity produced in a tapering 

 form to an obtusely conical apex. It is of a dull luteous yellow- 

 brown hue, with some faint traces of red-brown markings on the upper- 

 side, and thinly clothed with coarse hairs ; the plates of the spiracles 

 are reddish yellow-brown ; and the genital aperture is small, incon- 

 spicuous, and has no process connected with it. 



A single example of this species was contained in Prof. Traill's 

 Amazons collection. Although it presents some rather abnormal 

 characters, I consider it to belong to the genus Argyrodes. 

 Probably the abdomen, in the only example before me, had lost its 

 real colour; and its markings had perhaps become obliterated; still 

 the peculiar characters furnished by the form and surface of the 

 cephalothorax will hardly fail to enable the species to be easily 

 determined. 



Argyrodes felix, sp. n. (Plate XXX. fig. 19.) 

 Adult female, length to the extremity of the abdomen 2] lines, 

 and to the sjjinners l^. 



The cephalothorax, legs, palpi, and falces of this pretty Spider are 

 yellow-brown. The legs are moderately long, 1, 2, 4, 3, and fur- 

 nished with fine hairs only. 



