260 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3 d Ser. 



quite readily known by having only one large spot behind 

 on each side, not divided as usual. 



In my Colorado list I accidentally put X. bimaculatus 

 under X. montanensis, whereas it goes here; and vice versa 

 X. -pulverulentus is a synonym of X. montanensis, instead 

 of X. discursans. 



196. Xysticus curtus, sp. nov. 



Plate XVI, Fig. 8. 



Length 5.5 mm.; ceph. 2.3 mm. long, broad 2.3 mm.; femur I 2.1 mm. 

 Cephalothorax whitish above, brown on sides, ending behind in two spots 

 scarcely darker, a median pointed spot, in front a rather darker area, clypeus 

 whitish; mandibles pale, with brown at base; femora pale beneath, mottled 

 above; tibiae and patellae with two brown stripes above, between them a 

 white line; hind pairs slightly mottled; sternum grayish, with brown dots. 

 Abdomen gray, with indistinct transverse brown spots on the posterior part, 

 and two short faint stripes in front. A. M. E. equal to P. M. E., and fully as 

 far apart, plainly nearer to the A. S. E. than to each other; four pairs of 

 spines under anterior tibiae and metatarsi; sternum rather broad. Abdomen 

 small, broadest just behind the middle, broadly rounded behind. 



One female; Cape Region. 



197. Xysticus orizaba, sp. nov. 



Plate XVI, Fig. 6. 



Length 9 mm.; ceph. 3.8 mm. long, broad 3.4 mm.; femur I 3.4 mm. 

 Cephalothorax mostly brownish in front, pale behind, each brown side ter- 

 minated behind by two dark brown spots, the middle area terminated 

 behind by a pointed spot; a darker band connects the S. E., in front 

 of which it is white; mandibles mottled, paler at tips. Legs mottled, but 

 the femora mostly pale below, a white line above on patellae and tibiae; 

 sternum thickly dotted with brown; long mark on coxae, and a spot on the 

 trochanters dark brown. Abdomen with a large brown spot above, mar- 

 gined with pale; sides and venter pale, dotted with brown. A. M. E. fully 

 as large as P. M. E., plainly nearer to the A. S. E. than to each other, but 

 hardly so far apart as the P. M. E.; four pairs of spines under anterior tibiae 

 and metatarsi; sternum much longer than broad. Abdomen large, rather 

 depressed, broadest behind the middle, broadly rounded behind. Male 5 

 mm. long; ceph. 2.1 mm. long; femur I 2.5 mm. long. In general similar to 

 the female, but the femora spotted below, and the anterior tibiae and meta- 

 tarsi darker than the rest of leg. The abdomen of a rich brown color above, 

 with transverse irregular spots, and margined with white. 



Several specimens from Orizaba and one from Agua 

 Caliente. 



