The Pli(tla)i(j/iii(r of IU'dioIs. 87 



This species is very abundant on the rocky ledges of certain 

 parts of southern Illinois, being, in fact, the commonest har- 

 vest-man in the region, apparently replacing P. dorsatutn. On 

 the farm of Mr. Parker Earle, at Cobden, I obtained a long 

 series of both sexes, the creatures being everywhere abundant 

 about the rocky bluffs running across the place. 



Dr. Wood has shown that L. vittatum and L. dorsatum are 

 very closely allied and difficult to separate. According to him, 

 the former may be looked upon as the southern representative 

 of the latter, of which he had never seen any specimens from 

 farther south than Washington, D. C. After examining hun- 

 dreds of specimens of dorsatum and dozens of vittatum^ I am 

 unable to find any constant structural character by which they 

 may be separated, though the difference in the size of the body 

 and length of legs is very marked. I have only collected the 

 latter species late in the season when the individuals were 

 fully colored, but from some alcoholics collected earlier, I judge 

 that it undergoes the same color changes as dorsatum. 



L. nigropalpi, (Wood). 



Phalangium nigropalpi, Wood, 1. c, p. 22. 



(5. Body 4 mm. long, 3 mm. wide. Palpi 4 mm. long. 

 Legs: I., 49 mm.; II., 99 mm.; III., 50 mm.; lY., 67 mm. 



Dorsum minutely tuberculate, reddish brown, with a 

 subobsolete dark central marking, sometimes simpl}' repre- 

 sented by obscure dark blotches. Eye eminence at least as broad 

 as high, black above, canaliculate, with small black tubercles on 

 the carina. Mandibles light yellowish-brown, tips of claws 

 black; second joint with sparse hairs. Palpi slender, light brown, 

 distal portion of femur, and almost all of patella, black; femur, 

 patella, and tibia with small scattered tubercles, and short hairs; 

 tarsus pubescent, with a row of subobsolete, small, black tu- 

 bercles on its inner ventro-lateral surface. Ventrum paler than 

 dorsum, of a nearly uniform tint. Coxa? minutely tuberculate, 

 of same color as ventrum. Trochanters black. Legs very long, 

 slender, black, with white annulations at distal extremities of 

 femur and tibia, especially in the second and fourth pairs. 

 Shaft of penis flattened, contracted near its distal extremity, 

 and bent upwards, terminating in an acute point. 



