102 Mr. Black wall on a new Genus and 



is yellowish brown, with a broad band of brownish black, whose margins 

 are the darkest, extenJing along the middle. Mandibles conical and ver- 

 tical. The maxillaR incline towards the lip, which is semicircular, and 

 appear to be somewhat pointed, being obliquely truncated at the extre- 

 mity. These parts are of a pale reddish brown colour. Pectus heart- 

 shaped, of a yellowish brown hue. Eyes nearly equal in size; four, which 

 are intermediate, form a square, the two anterior ones being placed on a 

 projection of the ceplialothorax ; the other four are disposed in pairs 

 on the sides of the square, the eyes constituting each pair being contiguous, 

 and placed on a tubercle. Legs moderately robust, clad with hair, of a yel- 

 lowish brown colour ; the first pair is the longest, then the second, the third 

 pair being the shortest. The two superior tarsal claws are curved, and 

 pectinated, and the inferior one is inflected near its base. The palpi re- 

 semble the legs in colotir, with the exception of the terminal joint, which 

 is dark brown; the third and fourth joints are short, and strong, the latter 

 being most pronunent on the outer side ; the fifth is oval, convex, and 

 hairy externally, concave within, coniprising the palpal organs, which are 

 highly developed, and are provided, on the outer side, with a strong spine 

 ciu'ved into a circular form, and terminating in an obtuse projection at 

 their lower extremity ; they are of a dark red-brown colour. The ter- 

 minal joints of the p.ilpi have their convex sides directed towards each 

 other. Abdomen oval, convex above, thinly covered with hair, projecting 

 over tlie base of the cephalotliorax ; the upper part is brownish black ; 

 the sides and under part are pale yellow, the former being almost white at 

 their anterior part, near the ceplialothorax. The plates of the spiracles 

 are yellow, and eacli is surrounded by an irregular black line. 



Length, from the anterior part of the cephalothorax to the extremity of 

 the abdomen, ^^th of an inch; length of the cephalothorax -jVJ breadth 

 aV ; breadth of the abdomen Vt i length of an anterior Isg^; length of 

 a leg of the third pair Vs . 



I discovered males of this species on rails and gates, at Oakland, in June, 

 1836. 



Tribe, LATKRiGRADiE, Latfeille. 

 Genus, Philodromiis^ Walckenaer. 



Philodromus variatus. 



Ceplialothorax broad, convex, hairy, inversely heart-shaped, with a mi- 

 nute indentation in the medial line of the posterior region; sides dark- 

 brown mingled with yellow-brown, a broad band of the latter hue extend- 

 ing along the middle. Mandibles moderately strong, conical, vertical, 

 armed with one or two small teeth on the inner surface, of a reddish 

 brown colour. Maxillae yellowish brown, gibbous underneath, at the base, 

 inclined towards the lip, which is triangular, rounded at the tip, and of a 

 dark-brown colour, being palest at the apex. Pectus heart-shaped, thinly 

 covered with whitish hairs, of a yellowish brown colour, with reddish 

 brown lateral margins. Legs long, slender, provided with hairs and sessile 

 spines, of a pale reddish brown hue, which is deepest at the joints; the 

 second pair is consideral)ly the longest, then the first, the third pair being 

 slightly longer than the fourth. Each tarsus is terminated by two curved, 

 pectinated claws, beneath which is a small brush. The palj)i resemble the 

 legs in colour, and have a curved, pectinated claw at their extremity. Eyes 

 disposed in two transverse, curved rows, in the form of a crescent, on the 

 anterior part of the cephalothorax; the anterior row is much the shorter, 

 and the lateral eyes of the posterior row, which are seated on a small emi- 

 uence, are the largest of the eight. Abdomen oval, hairy, convex above. 



