some undescribed Species of ArawMss. lOS 



projecting a little over the base of the cephalothorax ; its colour is yellow- 

 brown, mingled with red-brown, and very dark brown ; a band of the latter 

 hue extends from the anterior part, along the middle, nearly half its length ; 

 this band is comprised between two parallel bands of pale yellow-brown, 

 and on each side of it are two sunken spots of very dark brown, forming, 

 together, a small quadrangle ; about the middle, several oblique, very dark 

 brown patches occur, behind which is a curved, transverse line of the same 

 tint; a black streak passes upwards from each spinning mammula of the 

 superior pair, the space between them being of a glossy yellow-brown co- 

 lour ; the sides are red-brown blended with brownish black ; the under 

 part is yellowish white faintly tinged with dull green, a large, longitudinal 

 band of very dark brown occupying the middle. The plates of the spi- 

 racles are dull yellow. 



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

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

 tV; breadth of the abdomen^; length of a leg of the second pair -^; 

 length of a leg of the fourth pair ■^. 



J found the female of this species on rails, at Oakland, in August, 1836. 



Philodromus mistus. 

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

 nute indentation in the medial line of the posterior region ; it is of a yel- 

 lowish brown colour, having a broad, longitudinal, dark brown band on 

 each side, and narrow, pale yellowish white margins. Mandibles mode- 

 rately strong, conical, vertical, armed with one or two very small teeth on 

 the inner surface. Maxillae powerful, enlarged externally, where the palpi 

 are inserted, very gibbous underneath, at the base, and greatly inclined 

 towards the lip, which they encompass. These organs are of a yellowish 

 brown colour, with the exception of the lip, which is triangular, rounded 

 at the tip, and dark brown at the base, the apex only being yellowish 

 brown. Pectus heart-shaped, thinly covered with whitish hairs, of a yel- 

 lowish brown colour, freckled with minute, blackish spots, which are densest 

 on the sides. Legs long, slender, provided with hairs and sessile spines, 

 of a pale yellowish brown colour, interspersed with minute blackish spots, 

 which are scarcely perceptible without the aid of a magnifier; the second 



{)air is considerably the longest, then the first, the third pair being slightly 

 onger than the fourth. Each tarsus is terminated by two curved, deeply 

 pectinated claws, beneath which is a small brush. The palpi 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- 

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

 projecting a little over the base of the cephalothorax ; the upper part is of 

 a pale yellowish brown colour, mottled with reddish brown, an obscure ob- 

 long oval band of the latter hue extending from the anterior extremity, 

 along the middle, nearly half its length; it is surrounded by an irregular 

 band of dark reddish brown, from which some imperfectly defined streaks 

 pass obliquely upwards, particularly in the posterior region ; the sides and 

 under part are dull yellow-white, minutely spotted with reddish brown, 

 three longitudinal bands of red-brown extending along the middle, and 

 meeting in a point near the spinners. Sexual organs of a very dark red- 

 dish brown colour. Plates of the spiracles dull yellow, or yellowish brown. 



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

 the abdomen, ^j^^ths of an inch ; length of the cephalothorax tV; breadth 

 tV ; breadth of the abdomen ^ ; length of a leg of the second pair \ ; 

 length of a leg of the fourth pair ^. 



