Neto England Brass khe, Agalenidm and Dysderidm. 167 



Micaria Westdug. 



This genus was first separated from Drassus by C. Koch under 

 the name of Macaria, which had before been used for a genus of Lepi- 

 doptera, and was therefore changed by Westring to Micaria in 1851. 

 They are all small and slender spiders with the cephalothorax arched 

 upward in the middle, without any dorsal groove or o\^\y a thick 

 opaque spot in place of it. The abdomen and usually the cephalo- 

 thorax are covered with flattened scales sometimes brightly colored 

 and ii-idescent. The tarsus and metatarsus of the first and second 

 feet have a double row of flattened hairs on the under side. 



Plentz's Herpyllus auratas, found farther south, belongs to this 

 genus and is nearly related to 31. longipes. 



Micaria longipes, uew sp. 



Plate III, figures la, 1&, Ic, \d, It;, ]/; 1//. 



Largest specimen 5"'"^ long. PI, iii, fig. 1. The cephalothorax 

 is twice as long as wide, widest across the middle. Head not much 

 narrowed. The eyes occupy half the width of the head. The front 

 row is nearly straight, the upper row with the middle eyes highest. 

 Eyes all nearly of the same size. The cephalothorax is highest in 

 the middle, curving downward toward both ends. The abdomen is 

 one-half longer than the cephalothorax and about as wide, blunt at 

 both ends and drawn in a little at the sides and above about one- 

 third its length from the front. The legs are long and slender, the 

 fourth pair longest. The colors are light yellowish brown with gray 

 hairs and scales which have green and red metallic reflections on the 

 abdomen. The legs are darker from before backward, the front 

 pair all light yellow except the femur, and the fourth and third pairs 

 with longitudinal brown stri})es that nearly cover the tarsal joints. 

 The cephalothorax is without markings. The abdomen has a pair of 

 white stripes at the constricted spot and a less distinct pair near the 

 front end. At the hinder end it is almost black. The scales of the 

 abdomen are of various forms, those of the white spot are long with 

 several branches at the base figs. U, le, those of the front of the 

 abdomen are more simple, fig, Ic, and those behind the white mark 

 ings are half as Avide as long \vith two rows of short branches fig. \f 

 at some distance from their edges. The under side of the abdomen 

 is as dark as the upper side. The white markings extend under half 

 way to the middle line. The sternum is nearly twice as long as 

 wide, widest at the second pair of legs and narrowed to a point 

 behind. 



