Mr. White on new or little known Arachnida. 475 



somewhat interrupted ; all three are margined with black, which 

 is deepest (thickest) at base ; beneath with two abbreviated, 

 somewhat distant, longitudinal white lines margined with black; 

 legs ringed with black. 



Chelicera vertical, rather longer than they are broad (at base), 

 smooth, somewhat swollen, armed with an incumbent short 

 claw. 



Eyes eight, arranged transversely in two lines ; the first very 

 short, containing two eyes ; the second, with two in the middle, 

 forming nearly a square with those of first line, which square 

 is on a projection of the cephalothorax ; the two lateral eyes are 

 so close together that they seem as one ; they are placed some- 

 what behind the middle pair, and are somewhat further re- 

 moved from them than these are from each other. 



Maxillae short, rounded ; base giving insertion to palpi, which 

 are weak, and have the fourth and fifth joints nearly equal ; 

 (fifth armed with a minute claw }). 



Mentum short, rounded, distinct from the heart-shaped sternum. 



Legs short ; last pair the longest ; third shorter than the first and 

 second, which are nearly equal in length. 



Cephalothorax longish, narrowed in front, and not much more 

 than half the width of the abdomen, which is of a fine oval 

 shape. 



Hab. Brazil, near Rio de Janeiro. C. Darwin, Esq. 



4. Tetragnatha bicolor, n. s. ^/ (g^' ^ ^'^^. 7^4^%4 



Legs, cephalothorax and palpi brownish yellow (in some the palpi M-. ^, k 

 are dark brown) ; body shagreneed above, griseous, with three or j ,<^ ^ ' 

 four indistinct brownish lines; a lighter band on the side, be- ^^'^'^ 

 neath darker ; two greenish gray lines run down the middle, 

 parallel to each other till just before the spinnerets, where they 

 somewhat converge ; eyes black. 



In the male the abdomen is nerved or shagreened with brownish, 

 and is not so distinctly marked beneath ; a brownish line, some- 

 what interrupted, and emitting a few equal, narrow, brown li- 

 neolets directed backwards, runs down the middle. 



Chelicera large, very prominent, loose, smooth, subcylindrical, as 

 thick at the end as at the base, and only slightly gibbous on the 

 inner edge, which is furnished with a double row of tooth-like 

 processes, upon which the strong and long claw folds inwards ; 

 this claw is more than half the length of the first joint, and at 

 base is straight, and then suddenly bent. 



Eyes eight, placed on two lunated parallel lines : the two inter- 

 mediate of the first line smallest and closer to each other than 

 they are to the side- eyes of the same line, while the two inter- 

 mediate eyes of the second line are somewhat more distant from 

 each other than they are from the side -eyes of the same line. 



Maxillae oblong, somewhat bent outwards at the end, which malvcs 

 the outer margin sinuated ; the inner margin is clothed with a 



