 The legs are reddish brown , or sometimes yellowish , with the femora of the anterior ( first ) pair being darker and enlarged , especially in the male . The anterior legs have three pairs of long spines on the ventral surface of the tibia and two pairs of spines on the metatarsus . The Peckhams give the following measurements for the lengths of the legs of a male specimen , starting with the anterior pair : 3 @.@ 7 mm , 2 @.@ 2 mm , 2 mm , 3 mm . In females , the fourth pair of legs are the longest . The pedipalp in the male has a single tibial apophysis which tapers gradually . 
