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



21. Nops sternalis, sp. nov. 



Plate XIII, Flg. 5. 



Length $ 5 mm. Cephalothorax, sternum, legs, palpi, and mandibles pale 

 yellowish; eye-spot black; abdomen pale gray. The cephalothorax is nearly 

 circular in outline; head much narrowed in front; eyes large, more than one- 

 half their diameter apart; sternum barely longer than broad. Legs with many 

 quite stiff bristles; anterior pairs slender, the femora barely thickened; meta- 

 tarsus curved and divided beyond middle into seven or eight false joints; 

 tarsus about one-third the length of metatarsus, and as long as breadth of 

 femora I; divided into five or six false joints. 



Two specimens from San Jose del Cabo. 



DYSDERID^. 

 22. Ariadne mexicana, sp. nov. 



Length 10 mm., ceph. 4.2 mm. long, 2.4 mm. wide. The cephalothorax 

 is shining chestnut brown, slightly darker in front; mandibles dark brown; 

 legs yellow-brown, anterior pairs darker except at base; sternum yellow- 

 brown, with faint darker spots each side; abdomen gray, darker above than 

 beneath; everywhere clothed with fine hair. Very similar in structure to A. 

 bicolor, but the cephalothorax and sternum more slender; the M. E. are 

 round, touching, and much more than their diameter (farther than in A. 

 bicolor) from the slightly larger S. E. The anterior femora are curved and 

 have a spine on inner side as in A. bicolor; there are four pairs of spines 

 under tibia I, six pairs under metatarsus I, the latter joint slightly curved, 

 one spine under tibia III, none under tibia IV. 



Two specimens; La Chuparosa. 



PHOLCID^E. 



23. Artema atlantica Walck.— San Jose del Cabo. 

 Very common in the Cape Region of Baja California. 



24. Physocyclus cornutus, sp. nov. 



Plate XIII, Fig. 41. 



Length 6 mm. Cephalothorax pale, a large brown spot over center with 

 dentate margins; eyes surrounded by black; on clypeus a brown stripe each 

 side from group of S. E. to the mandibles; abdomen pale, with several irreg- 

 ular dark bands on each side; legs and sternum pale, with brown dots and 

 brown rings at tips of the femora and bases and tips of tibiae. Cephalothorax 

 flat, without thoracic elevation in the S ; mandibles of S striated near base 



