104 Mr. Blackwall o?i imdescrihcd Araneidae. 



The male is smaller than the female, but the absolute length of its legs 

 is greiiter, a leg of the second pair measuring ,Vths of an inch; their rela- 

 tive length, however, is the same. C'ephalothorax dark brown, with a broad 

 band of a paler hue extending along the middle, and narrow, yellowish 

 white margins. Mandibles, maxillae, lip, pectus, legs, and palpi, of a deep 

 brown colour, the fifth joint of the palpi, and the base of the lip being 

 much the darkest, and the mandibles having a tinge of red. Abdomen of 

 a very dark l>rown colour, approaching to black on the upper part, freckled 

 with white, the oblong oval extending along the middle of the anterior part 

 being imperfectly defined by an obscure border of whitish hairs ; under 

 part very dark brown, approaching to black, the sides being of a paler 

 brown. Plates of the spiracles dark brown. The third and fourth joints of 

 the palpi are short, the latter projecting three apophyses from its anterior 

 extremity; one, on the under side, is short, strong, and furnished with 

 two pointed prominences ; the second, which is longer, and acute, is situ- 

 ated on the outer side ; and the third, which is very small, occurs in front : 

 the fifth joint is somewhat oval, being prominent on the outer side ; it is 

 convex and hairy externally, concave within, comprising the palpal organs, 

 which are highly developed, not very complicated in structure, with a fine 

 spine on the inner side, curved outwards round their lower extremity ; they 

 are of a very dark reddish brown colour. The hairs on the cephalothorax 

 and abdomen of very old males reflect brilliant hues of green and purple 

 when viewed in a strong light. 



I found specimens of this spider, which appears to belong to the section 

 VigilaricB of M. Walckenaer, on gates and rails, at Oakland, in June 1836; 

 in which month the female deposits between sixty and seventy spherical 

 eggs of a pale yellow colour, not agglutinated together, in a cocoon of 

 white silk of a slight texture, and lenticular form, whose greatest diameter 

 measures about -f^ths of an inch. The cluster of eggs is subglobose, mea- 

 suring^ of an inch in diameter. 



Tribe, C.t.grad;e, \LatreiIle. 

 (jrenus, L,ycosa, J 



Li/cosa leucophaa. 



This fine species has the cephalothorax large, thickly covered with hair, 

 inversely heart-shaped, depressed on the sides, and in the posterior region ; 

 its colour is greenish brown, the carina being the darkest, and immediately 

 below each lateral pair of eyes are two imperfectly defined, yellowish white 

 spots. Mandibles powerful, conical, vertical, armed with teeth on the 

 inner surface, clad with grayish hairs in front, and denstly fringed with 

 pale red ones near the extremity, on the inner side. Maxillae strong, 

 straight, enlarged and somewhat rounded at the extremity, which Is fringed 

 with pale red hairs on the inner side. Lip nearly quadrate, being rather 

 broader at the base than the apex. These paits are of a very dark brown 

 colour, the maxillae being paler at their extremities. Pectus heart-shaped, 

 dark brown, covered with hoary hairs. Legs robust, abundantly provided with 

 hairs and sessile spines ; they are yellowish brown, with spots and bands 

 of dark brown. The palpi resemble the legs in colour, and are furnished 

 with a slightly curved claw at the extremity. Each tarsus is terminated 

 by two curved, pectinated claws. Eyes eight in number, unequal in size ; 

 four, which are minute, form a row in front, the two exterior ones being 

 the smallest of the eight ; the other four are placed on the sides of the 

 anterior part of the cephalothorax, and form nearly a square, the anterior 

 pair being the largest of all. Abdomen oval, convex above, projecting 

 over the base of the cephalothorax; it i? rather broader at the posterior 



