246 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



longitudinal stripe over the anterior region, followed by four blackish, trian- 

 gular spots, the sides speckled with blackish spots; the underside pale, with 

 some darker lines. Legs olive brown, with infuscated distal regions to the 

 joints. Cephalothorax a little longer than broad, anteriorly one-half as wide 

 as in the middle; posterior eye-row straight; eyes equidistant; anterior row 

 recurved; A. M. E. closer together; four M. E. form a quadrangle higher than 

 broad, and narrower in front; abdomen pyriform, tapering toward the apex. 

 Legs long and slender; mandibles long, straight, parallel, and vertical; max- 

 illa; separated, not longer than broad, more than twice as long as the labium, 

 which is about twice as broad as long. Male similar to the female, but the 

 cephalothorax and legs paler, yellowish, and the markings on the abdomen 

 less distinct. 



Two specimens; Guaymas, May, and San Miguel de 

 Horcasitas. 



TETRAGNATHID^E. 



132. Tetragnatha mandibulata Walck — San Jose del 

 Cabo and Tepic, Nov. The 9 has a tooth on the fang at 

 base. 



133. Tetragnatha grallator Hentz. — Sierra Laguna and 

 San Jose del Cabo. Those from the latter place are smaller 

 but appear to be the same species. The eyes are farther 

 apart than in our northern specimens, but like those from 

 Texas. 



134. Tetragnatha peninsulana, sp. nov. 



Plate XV, Fig. 12. 



Length t 7.5 to 9 mm.; femur I S.i mm. long. Mandibles as long as the 

 cephalothorax, more porrect than usual, very pale, the large tooth above is 

 placed almost at extreme tip, and the one on inner margin is moved forward; 

 tibia of palpus once and one-third longer than patella. Length $ 10 mm., 

 femur I 7.2 mm.; abdomen 2 mm. wide. Mandibles nearly four-fifths as long 

 as cephalothorax, no tooth on outside of fang, which is wavy. Abdomen 

 cylindrical, scarcely enlarged at base; cephalothorax pale yellowish, some- 

 times with blackish marks; abdomen with a folium above, below there is a 

 black stripe margined with silvery. The S. E. are farther apart than in the 

 other species, but hardly as far as the M. E. ; they are often connected by a 

 blackish line. 



Two males and several females; San Jose del Cabo. 



