Spiders and Their Near Relatives 



longer than the penultimate, the palpal claw is dentate. Two 

 species have been described. 



Hadrobunus grandis (H. gran'dis). — In this species the 

 dorsum is finely spinulate; the legs are longer than in the following 

 species, and in the female are not much marked with brown at 

 the tips of the segments. It occurs in the Eastern States. 



Hadrobunus maculosus (H. mac-u-lo'sus). — This species 

 occurs in the Southern States and differs from the preceding in 

 that the dorsum is more smooth and is marked with many small, 

 round, pale spots; the legs are shorter and are more marked with 

 brown. 



Genus MESOSOMA (Mes-o-so'ma) 



This genus differs from Leiobunum in that the body is very 

 hard and granulate both above and below; the legs are very short; 

 and the fourth pair of legs are nearly as long as the second pair. 



Mesosoma nigrum (M. ni'grum). — The body is ovate; it is 

 black above, light beneath, the legs are black except at the base; 

 the ocular tubercle is destitute of spines but is armed with obtuse 

 granules. Length of body about one fifth inch. This species 

 occurs in the Southern and Western States. 



Family ISCHYROPSALIDiE (Isch-y-rop-sal'i-dse) 



This family differs from the Phalangiida?, to which it is 

 allied, in the following characteristics: the last segment of the 

 pedipalps is shorter than the penultimate one and is clawless; 

 the coxa of the fourth leg is not fused with the adjacent sternite 

 of the abdomen; the endite of the second leg is directed vertically 

 downward; and there are no tibial spiracles. 



Only one genus of this family has been found in the United 

 States. 



Genus TARACUS (Tar'a-cus) 



The members of this genus can be separated at a glance from 

 all other harvestmen occurring in our fauna by the great length 

 of the chelicerae, which are longer than the body and project 

 forward (Fig. 58). Three species have been found in the Far 

 West. 



Taracus spinosus (T. spi-no'sus). — This species differs from 

 the other two in that the dorsum of the abdomen is spinose, and 



76 



