1909.] NATURAL SCIENCES OF PHILADELPHIA. 203 



THERIDIID^E. 

 Theridium fordum Keyserling. 



Spina. Anier. Therid., I, 23, 1SS4. 



Santa Maria Uota; Tejar de Cartago, July; Tiribi; La Verbena; 

 Anonos, September; Fortuna; Escazii; Turrialba; La Bolca (Picado); 

 Punta Arenas (Biolley); San Joaquin Heredia Espinach; San Jose, 

 March; and Uricuajo (Pac.) (B. and T.). 



Theridium oblivium Cambridge. 



Biol. C. Am. Arachn. Aran., I, 207, 1896. 



Tejar de Cartago (B. and T.); La Palma; and La Verbena. 



Theridium taeniatum Keyserling. 



Spinn. Amer. Therid., I, 12, 1S84. 



Turrialba, Tablazo; and Escazii. 



Theridium mixtum Cambridge. 



Biol. C. Am. Arachn. Aran., I, 206, 1896. 



Turrialba; Orosi, 2d July (Picado); and San Joaquin Heredia 

 Espinach. 



Theridium compressum Cambridge. 



Biol. C. Am. Arachn. Aran., II, 383, 1902. 



Orosi, 19th July (Picado). 



Theridium florens Cambridge. 



Biol. C. Am. Arachn. Aran., I, 205, 1896. 

 Tejar de Cartago (B. and T.); Fortuna, with cocoon; Cartago, July, 

 with nest; and San Jose (Picado). 



Theridium rufipes Lucas 



Explor. Algerie, Zool., Ill, 263, 1849. 



Santa Maria Dota; and San Jose (B.). 



Theridium fordulum n. sp. 



Cephalothorax pale yellowish, a median black stripe over clypeus 

 through eye-area, and back where it tapers to a point; sides with a 

 broad black stripe. Abdomen dark brown, mottled with brown and 

 black and many silvery white marks, these silvery marks faintly out- 

 line a median folium on the anterior part of the dorsum, from its ends 

 a bright silvery line extends down on each side, behind on the middle 

 is an interrupted silvery line to tip. Venter with a black mark, 

 narrowed behind, sternum black, with a median pale streak. Legs 

 pale, heavily marked with black, the joints with broad black bands 

 at tip, and the rest of femur, tibia and metatarsus more or less dotted 

 with black; the hind femora are mostly black beneath, mandibles 



