428 



PSYCHE. 



[April 1S93- 



spinous hairs. Patella arched; its inner 

 lateral distal angle produced into a pro- 

 nounced conical tubercle. Tarsal claw dis- 

 tinctly pectinate. Ventral surface light gray. 

 Legs long, rather stout; coxae light gray, 

 remaining joints mottled cinnamon-brown. 



The mature condition is reached early 

 in summer. The Mississippi forms are 

 somewhat larger than plate 13, fig. 1, 

 which represents a specimen from a 

 more northern locality ; but the struct- 

 ural details are similar to those illus- 

 trated in fig. 2 of the same plate. 



An account of the variations and syn- 

 onymy of this species will be found in 

 one of the earlier issues of the Amer- 

 ican Naturalist for 1S93. 



LlOBUNUM POLITUM MAGNUM, new Sub- 



species. 



Male. — Body 5 mm. long; 4 mm. wide; 

 palpi 3.8 mm. long. Legs: first, 40 mm.; 

 second, 80 mm.; third, 40 mm.; fourth, 58 

 mm. Dorsum granulate; varying from light 

 cinnamon-brown to reddish brown, with no 

 markings except occasionally a faint indica- 

 tion of the usual central marking. Eye emi- 

 nence prominent, slightly constricted at base, 

 more or less black above, canaliculate, with 

 a regular curved series of small, acute, 

 blackish spines over each eye. Mandibles 

 brownish white; tips of claws black. Palpi 

 slender, light brown, with femur and patella 

 sometimes dusky; finely pubescent, with a 

 subobsolete row of minute dark tubercles on 

 the inner ventro-lateral surface of femur, and 

 another row on the inner ventro-lateral sur- 

 face of tarsus; joints slightly arched. 

 Ventrum with coxae, including the mem- 

 branous distal lateral tips, and generally the 

 trochanters, varying from light brown to ver- 

 milion red. Legs with proximal portions 

 light brown ; distally dark brown or blackish. 



Shaft of genital organ nearly straight, 

 slender, flattened, canaliculate; distal portion 

 very slightly expanded, then slightly con- 

 tracted, and again expanded into a half 

 spoon-shaped portion, and terminating in a 

 small acute point. 



Female. — Body 6.5 mm. long; 4.5 mm- 

 wide; palpi, 3.6 mm. long. Legs: first, 39 

 mm. ; second, 81 mm. ; third, 39 mm. ; fourthi 

 57 mm. Differs from the male in having a 

 larger, rounder body; and in the color of the 

 dorsum, which is brown, or reddish-brown, 

 with a rather distinct, darker central mark- 

 ing and numerous whitish spots arranged 

 more or less transversely. In some speci- 

 mens the central marking and spots are ob- 

 solete. Apical rings of ovipositor white. 



A few specimens of this form have 

 been taken during June and July at the 

 Agricultural College. A single female 

 has also been collected at the same place 

 in October. This is much more deeply 

 colored than the others of this sex ex- 

 amined, being clear reddish brown, and 

 having the central marking and white 

 spots on dorsum obsolete. It is illus- 

 trated at plate 15, fig. 1, and the struct- 

 ural of the northern L. fiolitum are 

 shown in fig. 2 of the same plate. 



EXPLANATION OF PLATES. 



Fig. 1. — Liobuninn vittatum. Male. Natural 

 size. 

 2. — Parts of same. Magnified. 

 2a. — Body. 



2b. — Eye eminence. Side view. 

 2c. — Eve eminence. Front view. 

 2d. — Palpus. Side view. 

 2e. — Claw of palpus. Side view. 

 3. — Liobunum vittatum dorsatum. Male 

 from Dakota. Natural size. 



