No. 1.] ATTID.E OF CENTRAL AMERICA. 97 



Under alcohol the spider presents the appearance that is 

 given in the drawing, the abdomen having a dark region on 

 each side, broken by white spots and bands, and a pale band 

 down the middle which widens out behind. When dry the 

 cephalothorax is seen to have, on the cephalic plate, and on 

 the crescent-shaped part of the thorax, a covering of iridescent 

 scales, while behind and on the sides it is of a bright cinna- 

 mon-brown, owing to the color of the hairs. The anterior sides 

 have wide short bands of white hairs and there is a central 

 white spot on the posterior thoracic part. The sides of the 

 abdomen are of a bright rich cinnamon-brown. A central 

 spot in front, two oblique bands on the anterior sides, two 

 large rounded spots on the middle sides, and two smaller spots 

 which mark off the brown region at the point where the central 

 band widens, are all of the purest white. The central band, 

 which widens behind more in some specimens than in others, 

 is covered with brilliant iridescent green scales. 



The legs are of a pale brown, without many hairs. 



We have seven females from Panama. 



This makes the second species of this genus Sidusa, de- 

 scribed in our paper on the Homalattus Group, p. 175. It 

 strikingly resembles the type, gratiosa, which is found on the 

 Amazon, both in shape and in its iridescent coloring. 



LYSSOMANES, hentz. 



After more extended study of this genus, the species of 

 which are found in North, Central and South America, we have 

 concluded that our former division into two sub-genera is un- 

 desirable. Due to the fact that the color fades rapidly in 

 alcohol, the species are difScult of determination. The distinc- 

 tive points must be looked for in the ornamentation of the 

 legs, the modification of the falces, the variation in size, and, 

 most important of all, in the reproductive organs. So far we 

 have seven species from North and Central America, four rep- 

 resented by both males and females, three by males alone, and 



