204 PROCEEDINGS OF THE ACADEMY OF [April, 



pale, each with an inner dark line. Abdomen high and rounded. 

 Metatarsus I about as long as' tibia plus patella I. Length 2.5 mm. 

 Chiral Paraiso, Costa Rica (Tristan and Biolley). 



Theridium biolleyi a. sp. 



Cephalothorax pale, with a broad median black stripe from eyes to 

 base, widened and then narrowed before middle, and with a lateral 

 extension each side, margin narrowly black; legs pale, with rings and 

 marks, mostly at middle and tip of joints, except tarsi. Dorsum 

 dark gray and white, with black patches mostly to outline a pale 

 median stripe; sternum dark, pale on each anterior side; venter pale, 

 with some small white spots," and a pair of larger submedian black 

 spots. Legs long, very bristly, tibia I a trifle shorter than the meta- 

 tarsus I; abdomen moderately high, rather long. General structure 

 as in T. tepidariorum; vulva shows two small openings as figured. 

 Length 4 mm. 



From Tablazo, Costa Rica (Biolley). 



Theridium rostratum Cambridge. 



Biol. C. Am. Arachn. Aran:, I, 204, 1S96. 



Tejar de Cartago (B. and T.). 



Theridium thorelli Cambridge. 



Biol. C. Am. Arachn. Aran., I, 132, 1894. 



Ahaya (Picado); and Volcano Poas. 



Theridium pioadoi n. sp. 



Cephalothorax brown, a broad dark-brown stripe on each lower 

 side. Abdomen generally pale, with a large black spot on each anterior 

 side, a smaller one behind it; on the dorsum behind the middle is a 

 large black spot, emarginate in front. Sternum yellow-brown, with 

 a median black streak, venter with a median black stripe, and the pos- 

 terior of the side-marks reaches down on the venter. Legs dull yel- 

 lowish, femora suffused black, with a paler spot above the tibia and 

 metatarsus with a dark ring at tip; mandibles yellowish, each with two 

 dark lines in front. Femora of legs rather heavy ; metatarsus I hardly 

 as long as tibia plus patella I; abdomen not especially high, rounded 

 above. Length 3 mm. 



From Orosi, Costa Rica, 18th July (Picado). 



Anelosimus studiosus Hentz. 



Journ. Bost. Soc. Nat. Hist., VI, 274, 1850. 



Tejar de Cartago (B. and T.); Aguas Calientes (Picado); Chiral 

 (B. and T.) ; Anonos; Tablazo; and Escazii. 



