1909.] NATURAL SCIENCES OF PHILADELPHIA. 213 



middle, the other one larger before middle, none in front. Length 

 6 mm. 



From Tablazo, September, Costa Rica (Tristan). Differs from 

 nearly all the species which have two spines at each posterior corner 

 in lacking spines at anterior corners. A.bisicata Walck., which seems 

 allied, has ten spines. 



Acrosoma 1 2-spinosa Cambridge. 



Biol. C. Am. Arachn. Aran., I, 63, 1890. 



Machuca (B.); Pitahaya, August (Picado); Embouchure du Rio 

 Jesus Maria (Pac), January (B. and T.) 



Acrosoma sexspinosa Hahn. 



Die Arachn., II, 18, 1S34. 



Surubres (B.); Embouchure du Rio Jesus Maria (Pac); January 

 (B. and T.). 



Acrosoma mammillata Butler. 



Proc. Zool. Soc. Lond., 1S73, 427. 



Esparta (Pac), 50 m., January (B.). 



Gasteracantha kochi Butler. 



Trans. Ent. Soc. Lond., 1S73, 169 



Punta Arenas (B.) ; San Jose, abundant on coffee plantations ; Guade- 

 lupe, July (Picado) ; San Joaquin Heredia Espinach ; Hatillo, 8th June 

 (Picado) ; Embouchure du Rio Jesus Maria (Pac), January (B. and T.) y 



Tricantha tricornis Simon. 



Hist. Nat. Araign. (I ed.)., 293, 1864. 



Tablazo. 



SPARASSID^J. 

 Strophius hirsutus Cambridge. 



Biol. C. Am. Arachn. Aran., I, 87, 1891. 



Turrialba. 



Heteropoda venatoria Linnet 



Syst. Nat. (XII), 1035, 1767. 



Punta Arenas (B.); Surubres, near San Mateo (Pac), January 

 (B. and T.). 



Selenops mexicanus Keyserling. 



Spinn. Amer. Laterg., 223, 1880. 



San Jose, in houses; Escazii; Pacaca; San Joaquin Heredia Espin- 

 ach; Uricuajo (Pac), 200 m., January (B. and T.); El Higuito, near 

 San Mateo (Pac), January (B. and T.); Canorejal de Asseri (Pac), 

 800 m., April (B.). 



