Zool.— Vol. I.] BANKS— MEXICAN ARACHNIDA. 215 



Cephalothorax about one-fourth longer than broad, considerably narrowed in 

 front, clothed with appressed hair, dorsal groove short; A. M. E. smaller 

 than others, separated from each other by almost their diameter, not half so 

 far from A. S. E. ; S. E. touching; P. M. E. oval, touching P. S. E., but sep- 

 arated from each other by fully their transverse diameter; mandibles stout, 

 slightly porrect, strongly diverging, a row of long hairs with curved tips on 

 their superior margin; sternum but little longer than broad. Legs quite large 

 and long; femur II about as long as the cephalothorax; tarsus plainly shorter 

 than metatarsus (legs I and IV lacking), clothed with quite long hair. Abdo- 

 men depressed, short and broad, once and a third longer than broad; inferior 

 spinnerets very much longer and larger than superior pair, with a long bundle 

 of tubules at the tip, they arise from the venter, one-third the distance from 

 tip to base. 



One specimen; no locality. 



DRASSID^. 



34. Drassus singularis, sp. nov. 



Plate XIII, Fig. 8. 



Length 10 mm. Cephalothorax, mandibles, and sternum reddish brown, 

 legs paler at base, darker toward the tips; abdomen brown above, paler at 

 base and on venter. Cephalothorax moderately slender; posterior eye-row 

 longer than the anterior row, slightly procurved; P. M. E. round, fully their 

 diameter apart, hardly farther from the P. S. E.; A. M. E. large, nearly their 

 diameter apart, very much closer to the smaller A. S. E. ; sternum one and 

 one-fourth times as long as broad, sides rounded. Abdomen one and two- 

 thirds longer than broad, depressed. One spine under tips of tibiae I and 

 II, two under bases of those metatarsi, many on hind legs, one above on 

 tibia III; scopulas on anterior tarsi. The epigynum shows a cavity broader 

 than long, anterior corner extending forward, and within on each posterior 

 side is a deeper cavity. 



One female; Mt. Orizaba. 



35. Drassus orizaba, sp. nov. 



Plate XIII, Fig. ii. 



Length 9 mm. Cephalothorax dark yellow-brown, darker in front; man 

 dibles dark red-brown; legs bright reddish yellow; sternum and mouth- 

 parts red-brown; abdomen light brownish. Cephalothorax rather slender; 

 posterior eye-row nearly straight, plainly longer than anterior row; P. M. E. 

 oval, less than half their diameter apart, more than their diameter from 

 the P. S. E. ; A. M. E. less than diameter apart, much closer to the equal 

 A. S. E.; mandibles large and porrect; sternum one and one-fourth as long 

 as broad, broad at base, tapering behind. Abdomen large, cylindrical, about 

 twice as large as broad. Legs short, no spines under anterior pairs, many on 



