334 A Nezv Jumping Spider. [zoe 



ment. The side color is due to the same scales and the black line 

 along the rim is due to the absence of them. The yellowish clypeus 

 is caused partly by long hairs and partly by scales. In the male the 

 coloring of the clypeus is not so clearly yellow because the hairs and 

 scales are sparser. In the upper cephalothorax these yellowish 

 scales are interspersed with other scale-hairs of like shape but of 

 a grayish color and most brilliant iridescence, which are particularly 

 numerous on the forepart and produce the bronze luster. In some, 

 especially in young specimens, these scale-hairs are thick all over. 



The skin color of the upper abdomen is deep brown or black, usu- 

 ally appearing brown to the eye but under the microscope black 

 with long black hairs. The yellow markings are formed of hairs 

 like those on the cephalothorax, while the longitudinal dark bands 

 are simply parts of the dark integument set in relief by the yellow 

 scale-hairs. The yellow along outside of bands is in natural females 

 a close collection of these scales, but in gravid females it appears as 

 a series of oblique, backward streaks, one from each of the dots on 

 the bands. This indicates weak portions of the integument, which 

 stretch to make room for the eggs. Bronze hairs also, like those on 

 the cephalothorax, are thickly set between the bands posteriorly, out- 

 side the bands anteriorly, and on the forepart of the abdomen. 

 Others are scattered among the yellow hairs. The yellow border in 

 both sexes is composed in part of longer hairs than those forming the 

 other markings. The dark upper abdomen of the male is due to the 

 absence of yellow scale-hairs, although there are enough bronze 

 scale-hairs to give it a luster. The under abdomen has the same 

 black skin covered with nearly white scale-hairs of a smaller size than 

 the yellow ones. They are not so thickly set along the middle and 

 the skin shows through, forming the darl^er central band. Male legs 

 dark brown with darker brown rings, as follows: Last half of femur 

 dark brown with tip end lighter; last end of tibia gradually darker; 

 light scale-hairs on all except first two joints. The second pair of 

 legs have dark rings on patella, tibia and tarsus; metatarsus with a 

 black tip; scales as in first pair; third and fourth pair same. Palpi 

 light brown, last joint dark, dark hairs on last joints, light hairs on 

 others; light yellow scales on iemur and two succeeding joints; 

 mouth-parts, coxae and sternum dark brown; anterior coxae darker 

 than posterior; falces nearly black; fang red-brown. 



