Zool.— Vol. I.] BANKS— MEXICAN ARACHNIDA. 283 



are edged with black, and sometimes nearly meet above; some white scales 

 on legs, anterior pair of 3 with long and short black hair. Mandibles of 3 

 vertical, unarmed, fang short; coxas I separated by fully width of labium; 

 leg I much the stoutest and longest, three pairs of spines under tibia, two 

 under metatarsi. 



One male and several females, which, however, are 

 scarcely adult, from Tepic, Oct. 



276. Philgeus consimilis, sp. nov. 



Plate XVII, Fig. 13. 



Length S 5.2 mm. Very similar to P. limbatus, but larger and rather 

 paler. Cephalothorax clothed with iridescent scales, and abdomen also as in 

 that species, with a white band around sides; metatarsus I is pale at base (in 

 limbatus wholly black), and the metatarsus IV is wholly pale (in limbatus 

 wholly black). The $ mandibles are long and divergent as in P. limbatus, 

 and armed with a tooth below at tip and a smaller one near base, the fang 

 straight. The 9, 6.5 mm. long, has a red-brown cephalothorax, with irides- 

 cent scales. Abdomen brown above, clothed with iridescent scales, a white 

 line around base, below this the sides are black, rather paler in the venter; 

 legs red-brown; the distal joints paler, often darker at the tip. 



Two pairs from Coral de Piedras. 



277. Dynamius opimus Peck. 

 Plate XVII, Fig. 25. 



One specimen from Tepic. 



278. Helorus perditus, sp. nov. 



Plate XVII, Fig. 19. 



Length S 7 mm.; ceph. 3.5 mm. long, broad 2.3 mm. The cephalothorax 

 is red-brown, blackish in the eye-region, a white stripe from lateral eyes back 

 just below dorsal eyes, then extending across to meet the one from the other 

 side; mandibles light red-brown; palpi black haired on femora and tarsus, on 

 patella thick white hair, very long at tip; legs yellow-brown, rather blackish 

 on femur I, tarsi pale; sternum yellowish; abdomen black, a white band at 

 base and an indistinct pale median stripe formed of chevrons, and a white dot 

 each side of it toward apex; venter pale, with black dots. The eyes of second 

 row are about one-half way between dorsal and lateral eyes. The third legs 

 are as long as the fourth; posterior metatarsi spined to base. The i palpi 



