6 Proceeding>i of the Boyal Irish Academy. 



falces are short, subconical, slightly prominent, and are armed with a 

 few minute teeth on the inner surface ; the maxillse are straight, and 

 enlarged and rounded at the extremity ; the lip is longer than broad 

 and rounded at the apex ; the sternum is long and narrow, and has 

 slight eminences on its sides, opposite to the legs. The legs are slender, 

 pro-vided with hairs, and have two curved claws at the extremity of 

 each tarsus, below which there is a small scopula ; the fourth pair is 

 the longest, then the third, and the second pair is the shortest ; the 

 palpi are short, and the digital joint is somewhat enlarged at its extre- 

 mity. These parts are of a yellowish-white hue, the falces and lip 

 having a slight tinge of red, and the genua and tibiie of the first pair 

 of legs have a pale-brown line extending along their anterior surface. 

 The abdomen is oviform, glossy, thinly clothed with pale hairs, and 

 is connected with the base of the cephalothorax by a long slender 

 pedicle ; it is strongly constricted about one-third of its length from 

 the anterior extremity, and is of a pale yellowish-brown colour, a 

 transverse band before and after the constriction, and the branchial 

 opercula having a brown hue. 



Family LYSSOIIAXID.E. 

 The spiders of this family are most nearly allied to those of the 

 family Salticidae, but they differ from them decidedly in the form of 

 the cephalothorax, the disposition of the eyes, the figure of the max- 

 illse, of the lip, and sternxim, and also in the structure of the spinners, 

 the superior pair having the spinning-tubes arranged on the inferior 

 surface of the pointed terminal joint. These marked differences in 

 their external organization, indicating a corresponding modification of 

 habits and economy, have induced me to propose for their reception a 

 family distinct from that of the Salticida:. 



Genus LrssoiiAWES, Hentz. 



[Although the genus Lyssomanes (Hentz) is an exceedingly distinct 

 and remarkable one, there appears to be nothing to warrant its separa- 

 tion from the Salticides, with which its general form and characters 

 show it to be unmistakably allied. The example from which Mr. 

 Blackwall's description is made had apparently not long cast its skin, 

 so that its colourless condition is probably not that which belongs to 

 the adult form.] 



Ltssomakes PALLExs, n. sp. Plate 1, fig. 5. 



Length of an immature male (not including the spinners), \ of an 

 inch ; length of the cephalothorax, ^V ; breadth, -iV ; breadth of the 

 abdomen, -oV ; length of a posterior leg, i ; length of an anterior 



Ipo- --fi- 



The colour of this spider is white tinged with yellow, particularly 

 on the sides and base of the cephalothorax. The eyes are disposed on 

 tlie anterior part of the cephalothorax ; two, which are situated in 



