288 Wisconsin Academy of Sciences, Arts and Letters. 



Legs ordinary and &1* nder excepting those of the first pair which are 

 thicker than the others, with the tibia enlarged and hollowed on its 

 internal border to form a moderately deep groove; each of the borders 

 of this groove has three long spioes each articulated on an elevation 

 which is low but much larger than the spine, and some irregularly 

 distributed bristles; at the bottom of the groove is found a comb 

 composed of wide, flattenei hairs, which are crowded closely to- 

 gether, and disposed in a simple row. 

 Figure small. 



This curious genus, in which the first legs are much thicker than the 

 others, with the tibia greatly enlarged, resembling at the first glance the 

 claws of crayfish and yet more those of chelifers, is characterized also by 

 the extreme flatness of the cephalothorax, by the length of the cephalic 

 part, and by the eyes of the last row being placed very far back. 



COCALUS C. Koch. 1846. 



S^jn.: 1846. Cocalus C. Koch, Die Arachn., 13, p. 180. 



1850. " Id., Uebers. d. Arachn. Syst., 5, p. 48. 



1877. " Thorell, Studi Ragni Malesi e Papuani, I, p. 254. 



1878. " Id., ibid., IE, p. 283. 

 1881. " Id., ibid., Ill, p. 492. 



Eyes of the first row all close together in a straight line. The two middle 

 eyes are large, the outer, in diameter, scarcely half as large as the 

 middle eyes; the eyes of the third row looking sideways, standing 

 in a quadrangle with the first row, and as large as the lateral eyes of 

 that row; the eyes of the second row only a little smaller than these, 

 and placed half way between them. 



Falces long, slender, vertical, cylindrical, with a rather short fang. 



Palpus rather long, the first three joints slender, the fourth wide and 

 short, the tarsus large, swollen, the bulb entirely covered; the bulb 

 simple, with protuberances (einfach knotig), projecting a little 

 forward. 



The cephalothorax of this spider departs from all koown species. The 

 headplate forms an ascending slope from the first row of eyes, and ends 

 in a roof-shaped ridge from which the thorax falls in a steep slope, to the 

 hinder edge; the sides of the cephalothorax. however, are almost vertical, 

 and therefore when looked at from above, it appears narrow. The abdo- 

 men is much narrower than the cephalothorax and cylindrical. The spin- 

 nerets are, in comparison with other genera, long and slender, the two 

 upper and the two lower however, have but half the length of the two 

 middle ones. The legs are rather long, the first and fourth pairs almost 

 equally long, the second pair somewhat shorter than the first, and the third 

 somewhat shorter than the second. All are rather slender. 



