Zool.— Vol. I.] BANKS— MEXICAN ARACHN1DA. 221 



P. M. E. separated by once and a half their d'.ameter, less than diameter 

 from P. S. E.; anterior row rather recurved; A. M. E. hardly their diameter 

 apart and closer to the rather smaller A. S. E. Legs short, a spine under 

 patella I, three or four under tibia I, and one under base of metatarsus I; 

 posterior legs more thickly spined. Sternum once and a fourth longer 

 than broad, tapering in front and behind. Abdomen once and three-fourths 

 longer than broad, truncate at base; spinnerets very long. The epigynum 

 shows only a nearly circular cavity, and the outline of two bodies toward the 

 front and a line each side. 



A few specimens from Sierra San Lazaro, Sept. It is 

 readily separated from C. bivittatus Hentz. by the three 

 stripes on abdomen, its smaller size, and by its more slen- 

 der body. 



49. Cesonia mexicana, sp. nov. 



Plate XIII, Fig. 24. 



Length S 6 mm. Cephalothorax dark brownish, with a narrow median 

 white stripe, and a stripe each side; legs yellowish brown, tinged with black- 

 ish; sternum and mandibles brown; abdomen white above, with a black 

 stripe each side and a broader one in the middle, all reaching to the tip; 

 venter brownish; mostly clothed with black hair. Cephalothorax quite broad, 

 much narrowed in front; eyes about as in preceding species; sternum very 

 broad and rounded; abdomen narrow, a long horny shield at base. Legs of 

 moderate length, three pairs of spines under tibia I, one under base of meta- 

 tarsus I, posterior pairs thickly spined; tibia of S palpus short, with a long 

 slender slightly curved projection at the outer tip; tarsus short, with a long, 

 dark, simple bulb and beyond a small pale portion. The $ is 7 mm. long, 

 agrees with <5 in color and markings, has no horny shield at base of abdomen 

 which is broader. The epigynum shows two holes about their diameter 

 apart. 



Male from Mt. Orizaba; female from Tepic, Nov. It is 

 distinguishable from C. bivittatus Hentz. by its three stripes 

 on abdomen, by darker color, and by the more curved pro- 

 jection to tibia of $ palpus. It differs from the preceding 

 species principally in broader cephalothorax, larger size, 

 darker color, and shape of epigynum. 



50. Gnaphosa decepta, sp. nov. 



Plate XIII, Fig. 14. 



Length 97 mm. Cephalothorax, legs, and sternum bright yellowish brown, 

 the former with some blackish marks around the dorsal groove, and the tarsi 

 of anterior legs and tips of palpi rather red-brown; mouth-parts red-brown; 



( 1 ) May 2, 1898. 



