203 [WUder. 



The entire upper and anterior surface of the cephalothorax is jet 

 black, but behind the eye-spots it is thickly covered with little white 

 hairs, except in six spots, three upon each side over the origins of the 

 three anterior pairs of legs ; the first pair of spots being the largest 

 and pointing obliquely forward and outw'ard. The edges of the cepha- 

 lothorax are reddish-brown. The eye-spots are black and eight in 

 number, four in the centre in form of a square, and two upon each 

 side, 'one above and one below a rounded elevation. The falces are 

 black. The abdomen above is light yellow. On each side of the mid- 

 dle line are six silvery spots, of which the 1st and 3d pairs are the 

 largest, then the 2d, 4th, 5th, and 6th; the three anterior pairs are 

 rounded, the others flattened laterally. On the middle line between 

 the 1st and 2d pairs, and again between the 3d and 4th pairs, the 

 pulsations of the dorsal vessel are visible; besides the larger spots 

 there are many smaller ones irregular in size, shape and position, but 

 more numerous anteriorly. The anterior edge of the abdomen is 

 olive-brown; in front of and below it is a silvery cross stripe semilunar 

 in shape, the horns pointing backward ; and just behind it is a similar 

 stripe. 



The sides of the abdomen are lighter than the top and the spots are 

 generally silver-colored and oblong, especially in the line of the horns 

 of the above mentioned white stripe. The lower surface is still darker 

 than the sides, but the anterior third is a hard and horny plate with a 

 free posterior edge covering the generative orifice. The surface of this 

 is by its coloring divisible into three sections, one median and two lateral, 

 each of which is again composed of a broad anterior and a narrow poste- 

 rior portion. The anterior median portion is brown and depressed be- 

 tween the lateral portions, which are black and slightly punctate and 

 bordered internally by a yellow, and externally by a dull reddish 

 stripe; the posterior median section is dark brown, raised and quite 

 convex, while the lateral portions are dull red and flat, with sharp pos- 

 terior edges. 



The middle third of the lower surface of the abdomen is dull red 

 without spots and separated from the sides by yellow stripes or series 

 of spots, and from the posterior third by several yellow spots ; this third 

 is also dull red and without spots, but not so distinctly separated from 

 the sides; behind the posterior third, and forming its boundary, is the 

 group of spinnerets, or mammulae, of Avhich there are two principal 

 pairs, anterior and posterior. Between these and concealed by them is a 

 very small pair, the nature and use of which I have not yet ascertained. 

 In color the mammulae are dull red, but the apices are surrounded by 

 short black hairs ; behind the spinners and enclosed in the same fold 

 of integument is a median papilla through wliich tlie excrement is 

 voided. The posterior surface of the abdomen is flattened, and re- 



