242 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3 d Ser. 



The cephalothorax is quite slender, low, and considerably narrowed in front; 

 eyes large and close together; posterior eye-row procurved; P. M. E. much 

 less than their diameter apart, and barely further from the S. E. ; A. M. E. 

 smaller, nearly touching, quadrangle of M. E. higher than broad. Legs quite 

 slender; femur I a little shorter than the cephalothorax, clothed with stifl 

 bristles, one spine above on tibiae and one on tip of patella;; sternum a trifle 

 longer than broad, sides rounded, tip barely produced between the hind coxae. 

 Abdomen once and a half longer than broad, base rounded, apex pointed. 



One female; Tepic, Nov. Possibly not this genus. 



118. Acartauchenius insanus, sp. nov. 



Plate XIV, Fig. 12. 



Length $ 3 mm., S 2.4 mm. Cephalothorax, legs, and sternum pale yellow- 

 ish, former and latter margined with blackish; abdomen whitish, with black 

 median stripe, connected behind to a broader lateral one; a narrow line on 

 each side of the venter, and blackish around the spinnerets. Cephalothorax 

 considerably narrowed in front, highest at dorsal groove, higher in S than ? , 

 sloping to the swollen clypeus; posterior eye-row strongly procurved; anterior 

 row slightly recurved; A. M. E. smaller than other eyes, and touching; S. E. 

 touching; P. M. E. a little more than their diameter apart; behind the P. M. 

 E. in the i there is a patch of stiff bristles; sternum barely longer than broad, 

 sides rounded, pointed between the hind coxa;. Abdomen more than once 

 and a half as long as broad, moderately convex above and pointed behind. 

 Legs short; femur I shorter than the cephalothorax; under tibiae land II two 



rows of spines, one above on all tibiae and patellae; these are very long in the 



$ but short in the S . 



Several specimens; San Miguel de Horcasitas. 

 119. Tmeticus tridentatus, Em. 



Erigone dentimandibula Keys (?), Die Spinn. Amer., Therid., p. 168. 

 One male from Tepic. 



120. Tmeticus incertus, sp. nov. 



Plate XIV, Fig. 28. 



Length? 2.2 mm. Cephalothorax dull yellowish brown; legs paler yellow- 

 ish; mandibles more reddish; sternum blackish; abdomen dark gray, darker 

 on the venter, above with two large indistinct pale spots, and above the 

 spinnerets a few narrow chevrons. Cephalothorax not very broad, not much 



