chamberlin: the arachnida. 



229 



Theridion tosum/ sp. nov. 

 Plate 16, fig. 1-4. 



Carapace and chelicerae pale testaceous; sternum, labium, and 

 endites yellow; legs yellow except proximally above where similar 

 to carapace; all these parts without special markings. Abdomen 

 grey, a longitudinal wavy white line on each side of middle of dorsum 

 the two lines converging to spinnerets ; a few small light dots between 

 the wavy lines caudally; otherwise the abdomen is unmarked. 



Posterior row of eyes substraight or slightly recurved; eyes nearly 

 equidistant, the medians being about their diameter apart and the 

 same distance or slightly farther from the laterals. Posterior lateral 

 eyes equal to the anterior laterals or very nearly so. Anterior row of 

 eyes in front view straight ; median eyes slightly smaller than laterals, 

 to which they are closer than to each other, more than their diameter 

 apart. Area of median eyes equal in width in front and behind, equal 

 in length and breadth or slightly wider, (Plate 16, fig. 3). 



Labium wider than long as usual; distally widely semicircularly 

 rounded, (Plate 16, fig. 1). 



Sternum longer than wide in ratio 6 : 5, more narrowly attenuated, 

 and rounded caudad than, e. g., in the succeeding species, (Plate 16, 

 fig. 2). 



Anterior paired claw of leg IV with four teeth of which the most 

 distal is very long and reaches about the same level as tip of claw; 

 teeth of other claw shorter. Unpaired claw untoothed. 



Female. Length 4.3 mm. Length of cephalothorax, 2 mm.; 

 width, L47 mm. 



fern. tib.+pat. met. 



tar. 

 .9 mm. 



.7 

 .6 



.8 



total 

 8.0mm. 

 6.3 

 5.0 



7.8 



Leg I 2.. 3 mm. 2.9 mm. 1.9 mm. 



Leg II 2 2.1 1.5 



Leg III 1.9 1.5 1.0 



Leg IV 2.9 2.2 1.9 



Locality.— Ruaidquma, 5,000 feet, July. (Type, M. C. Z. 180, 

 one female). 



Theridion leguiai, sp. nov. 

 Plate 15, fig. 7-10. 



Carapace on sides obscure olive-white, a broad black median longi- 

 tudinal band over clypeus and eye-area and narrowing from there 



Gosiute tosibit, iosa, white or light colored. 



