426 CLASS ARACHNIDES. 



more narrowed at its base, dilated and rounded towards the 

 end; the first pair of feet is the longest; the fourth and second 

 are almost equal ; the third is the shortest. 



Ctenus, Walck., 



Have the eyes disposed on three transverse lines, 2, 4, 2, and 

 forming a sort of curvilinear triangle, inverted, and truncated 

 before or at its point ; the tongue is square, and almost isome- 

 trical ; the fourth pair of feet, and, next to them, the first, are 

 the longest ; the third is the shortest. 



This genus has been established on a sort of arachnid, 

 tolerably large, which is found at Cayenne. Some others 

 have been since discovered, either at the same colony, or at 

 Brazil, but all unpublished. 



DoLOMEDES, Latr., 



Whose eyes, disposed on three transverse lines, 4, 2, 2, re- 

 present a quadrilateral, a little broader than long, with the 

 two last, or posterior ones, situated on an eminence, and 

 which have the second pair of feet as long, or longer than the 

 first ; those of the fourth are the longest ; the tongue is square, 

 and as broad as high, like that of Ctenus. 



Some have the two lateral eyes of the anterior line larger 

 than the two comprized between them, and the abdomen in 

 an oblong oval, and terminating in a point. 



The females construct at the summits of trees loaded with 

 leaves, or in bushes, a silken nest, in the form of a funnel or 

 bell ; lay their eggs there, and when they proceed to the 

 chase, or are forced to abandon their retreat, they always 

 carry with them their cocoon, w^hich is fixed upon the chest. 

 Clerck tells us that he has seen individuals leap very promptly 

 on flies which were hovering around them. 



The others have the four front eyes equal, and the abdomen 

 oval, or roiuided at the end. 



