1909.] NATURAL SCIENCES OF PHILADELPHIA. 207 



Tetragnatha antillana Simon. 



Proc. Zool. Soc. Lond., 1897, S68. 



San Jose; La Verbena; San Joaquin; and Tejar de Cartago. 



Tetragnatha guatemalensie Cambridge. 



Biol. C. Am. Araehn. Aran., I, 8, 1889. 



San Jose; and Santa Maria Dota. 



Tetragnatha mexicana Keyserling. 



Verh. zool. hot. Ges. Wien, 1865, 854. 



La Verbena. 



Tetragnatha confraterna n. sp. 



Cephalothorax pale, with indication of a broad stripe over head, 

 divided by a pale median line. Abdomen dark, rather swollen at base, 

 and at tip above is slightly projecting; legs of male very pale, of female 

 darker. Anterior side-eyes plainly smaller and well separated from 

 the posterior side-eyes; anterior median eyes larger than all others. 

 Mandibles porrect, elongate; in female nearly as long as the cephalo- 

 thorax, the outer corner below with a strong tooth ; the male mandibles 

 are about as long as the cephalothorax, slightly divergent, toothed as 

 in the figure; the tibia and patella of palpus of equal length. Length 

 10-12 mm. 



From Machuca (Biolley), Escazii (Tristan), Tiribi (Tristan), and 

 Esparte (Biolley); all Costa Rica. 



Tetragnatha tenuissima Cambridge. 



Biol. C. Am. Araehn. Aran., I, 9, 1889. 



Tejar de Cartago; and Orosi (Picado). 



Tetragnatha tropica Cambridge. 



Biol. C. Am. Araehn. Aran., I, 11, 1889. 



Guanacaste (Lankester). 



Tetragnatha tristani n. sp. 



Cephalothorax pale yellowish, abdomen rather silvery above; 

 venter and sternum blackish; legs pale, greenish yellow, tips of tibia 1 

 and metatarsi darker; S. E. touching, the lower one much the smaller; 

 abdomen not very slender; mandibles not very long, nor much porrect, 

 a tooth above before tip, not very long, and three subequal teeth on 

 inner margin. It runs to T. digitata in the Biologia, having the 

 tibia of palpus extremely short, but differs in the mandibles. Length 

 4 mm. 



San Jose (Tristan). 



