338 Wisconsin Academy of Sciences, A7is, and Letters. 



Guatemala, metallicus P., from St. Vincent, and five new 

 species described below. M. Simon writes to us that he lias 

 more than fifteen species from Brazil. 



Dynamius is distinguished from Escambia by having the first 

 row of eyes plainly curved, with the lateral eyes of the first row 

 larger, relatively to the middle eyes; and by the shape of the 

 thoracic part, which, in Escambia, falls more or less steeply 

 from the dorsal eyes. Joins, which it also resembles, is found 

 only in Australia. From PhUaeus it is easily distinguished by 

 the greater relative length of the third and fourth pairs of legs. 



In all our species of Dynamius there is a metallic lustre on 

 the integumient of the cephalothorax (even where this is cov- 

 ered with scales or hairs), and, to a greater or less e'xtent, on 

 all the joints of all the legs, especially on the tibiae and meta- 

 tarsi of the first and second pairs. This lustre is also found in 

 Escambia. 



The color and marking of the different species are very sim- 

 ilar, consisting of white transverse banding on a dark back- 

 ground. 



Dynamius blandus, sp. nov. 

 PL XXVI, fig. 1 ; PL XXV, figs. 9-9b. 



Length $> 6.5 ? 8 mm; ? 10 mm. 



Legs, ^ 3421, ? 3412, first, second, and third, a little the 

 stoutest. 



The cephalothorax seems to have been covered with a mix- 

 ture of white and vellowish hairs. Around the eyes of the first 

 row and on the cheeks and clypeus are red hairs. There are 

 white bands around the sides. The abdomen is dark colored 

 in the male but in the female is sometimes brown fiecked with 

 white. The markings are formed by scales and are white or 

 yellowish. They consist of a band on the anterior part, of a wide 

 transverse band behind the middle, and of a pair of spots at the 

 posterior end. Behind the band is a dark region which is 

 divided into two parts by a slender line of tiny white chevrons 

 running forward from the spinnerets. The first, second, and 

 third pairs of legs have slight fringes of dark hairs on the inner 

 and outer sides. The palpus has Avhitc hairs on the femur and 



