234 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



ULOBORID^. 



87. Uloborus plumipes Luc. — One specimen from Tepic 

 looks very much like the Texan example of this species, 

 very much darkened all over; the metatarsus I pale; tibia 

 and femur I black. 



88. Uloborus formosus Marx ms. 



Plate XIV, Fig. 31. 

 Female 5 mm. long. 

 Cephax. long 1.5, broad in front .8, broad in middle 1.3. 

 Abdomen long 4, broad 2.2, high at the hunches 2.5. 

 Femur I 2.5, pat.+tibia 2.6, metat. 2, tars. 1.1 

 II 1.5 1.5 1.1 .7 



III 1.2 1.1 .8 .8 



IV 2. 2. 1.2 1. 



Cephalothorax brown, with a short but broad, light grayish middle line over 

 the posterior part of pars cephalica, and two oval dots at the thoracic part. 

 Mandibles brownish yellow; maxilla; blackish brown; labium black, with a 

 white tip; sternum blackish brown with dense black hairs; coxa; light grayish 

 white, with a black spot in the center. Legs, 1st pair, femur brownish, in- 

 fuscated, with a whitish ring just beyond the middle; patella infuscated; tibia 

 infuscated, with a white ring at the base and near the distal end; metatarsus 

 and tarsus dark infuscated toward the end; 2nd leg, femur light grayish 

 white, with three dark rings, one at the base, the other near middle, and the 

 third at tip; tibia with a band at middle and one at tip; metatarsus and tarsus 

 of the same ground color and infuscated at tips; legs 3 and 4 of the same 

 color and markings as leg 2, only the metatarsi with a ring near middle and 

 one at tip. Abdomen, dorsal surface gray with a whitish center, which is in- 

 terrupted by a dark gray middle line, which reaches over the basal half; the 

 sides blackish; and at the under side behind the fold white with a square 

 black spot, with two longitudinal white lines near the sides, and behind this 

 with black diverging lines which run toward the black spinnerets. 



Cephalothorax slightly longer than broad; the mouth-parts similar to those 

 in the other species; sternum narrow and long; abdomen elevated by a pro- 

 tuberance which gives the dorsum an angular aspect. 



One female; Orizaba. 



89. Uloborus diversus Marx ms. 



Plate XV, Fig. 17. 



Cephax. long 1.5, broad in middle 1.2, broad in front .6 mm. 

 Abdomen long 4., thick at the hunch 2.5. 

 Femur I 2., pat.+tibia 2., meta. 1.7, tarsus .6 

 II 1.2 1.2 .7 .5 



III 1. .8 .6 .5 



IV 1.3 1.5 1. .7 



