Zool.— Vol. I.] BANKS— MEXICAN ARACHMDA. 217 



a dense fascicle of hair under the claws. Abdomen rather cylindrical; spin- 

 nerets short, close together. The epigynum shows two large dark spots and 

 between them a narrow furrow open in front. 



One female; San Jos6 del Cabo, Sept. It differs from 

 the genus in having larger, more toothed mandibles, and 

 shorter spinnerets. 



38. Prosthesima grisea, sp. nov. 



Plate XIII, Fig. 33. 



Length 7 mm. Cephalothorax, mandibles, legs, and sternum pale reddish 

 brown; the legs rather more yellowish; abdomen above and below dark gray. 

 Cephalothorax rather broad, considerably narrowed in front; posterior eye- 

 row straight; the P. M. E. oval, about one-half their diameter apart, rather 

 farther from the equal P.S. E.; anterior eye-row about as long as the posterior 

 one, procurved; A. M. E. scarcely their diameter apart, closer to the equal 

 A.S. E.; sternum longer than broad, truncate in front, sides rounded. Legs 

 rather short and stout, no spines under leg I, one under tibia II, and two 

 under metatarsus II, many on hind pairs but not above on tibiae. Abdomen 

 depressed, truncate at base, blunt pointed behind. The epigynum shows a 

 rounded cavity with a triangular median extension in front. 



One specimen; Cape Region. 



39. Prosthesima peninsulana, sp. nov. 



Plate XIII, Fig. 16. 



Length 8 mm. Cephalothorax, mandibles, and sternum bright reddish 

 brown; legs rather paler; abdomen blackish, paler below. Posterior eye-row 

 straight, barely longer than anterior row; P. M. E. large, oval, almost touch- 

 ■ ing, but little farther from the P. S. E. ; anterior row procurved; A. M. E. 

 about one-half their diameter apart, closer to the hardly larger A. S. E.; 

 sternum oval. Abdomen once and a half longer than broad, truncate at 

 base, depressed. Legs moderate, no spines under tibia and metatarsus I, but 

 many short stiff bristles; many spines on hind legs. Epigynum shows a 

 somewhat triangular cavity indented by two slender projections from behind. 



One example ; no locality except Baja California. 



40. Prosthesima mexicana, sp. nov. 



Plate XIII, Fig. 18. 



Length 6-8 mm. Cephalothorax and mandibles reddish yellow; legs and 

 sternum paler; abdomen red-brown above, paler beneath. Cephalothorax 

 moderately slender, much narrowed in front; eyes close together; the pos- 

 terior row slightly procurved; the P. M. E. somewhat oval, less than one-half 



