226 
Psyche 
[December 
Bolivia 4.0 mm. Carapace 1.7 mm long, 1.4 mm wide. First femur, 
3.7 mm; patella and tibia, 3.5 mm; metatarsus, 4.2 mm; tarsus, 1.2 
mm. Second patella and tibia, 2.1 mm; third, 1.4 mm; fourth, 2.3 
mm. 
Diagnosis. It is not certain whether females have been correctly 
separated from C. vittatula Roewer. The light area of the epigynum 
has a dark spot anterior (Figs. 34, 35). Only large collections of 
accompanied females will make the separation of the species possible. 
Distribution. Colombia to Bolivia. 
Records. Colombia. Cauca: 43 km S Popayan, March 1955, ? 
(E. I. Schlinger, E. S. Ross, CAS). Ecuador. Los Rios: Macuchi, 
copper mining camp inland from Rio Palenque, March, 1943 9 (H. 
E. Frizzell). Tungurahua: Mt. Tungurahua, 1900-2000 m, Apr. 
1939, 9 ( W. C. Macintyre) ; Banos, 1850-2000 m, Apr. 1939, 9 (W. 
C. Macintyre, AMNH) . Bolivia. Chaco, 2000 m, 9 , c? (MNHN). 
Chrysso compressa (Keyserling) , new combination 
Figures 63-70 
Achaea compressa Keyserling, 1882, Die Spinnen Amerikas. Theridiidae, 
2(1): 107, pi. 5, fig. 69, 9. Female type from Amable Maria, 
[Junin], Peru in the Polish Academy of Sciences, Warsaw. 
Theridion conspersa, — Simon, 1894, Histoire Naturelle des Araignees, 1: 535 
(misspelling) . 
Theridion compressum, — Roewer, 1942, Katalog der Araneae, 1 : 491. 
Comments. A specimen, presumably collected with the type, in the 
British Museum, Natural History, was examined. The abdomen 
resembles C. cambridgei , it has slight grooves on sides; a black band 
covers dorsum. 
Description. Carapace yellow-white, yellowish in head region. 
Sternum yellow in Peruvian specimens, black in Brazilian. Legs yel- 
low-white, distal ends of most leg segments darker yellow with denser, 
darker hairs. Abdomen with median dorsal colorless area and with 
white pigment on each side. Brazilian specimens have genital area 
Explanation of Plate 16 
Figs. 52-54. Chrysso ribeirao sp. n. 52. Female abdomen, lateral view. 53. 
Female genitalia, dorsal view. 54. Epigynum. 
Figs. 55-57. C. pulchra (Keyserling). 55. Female abdomen, lateral view. 
56. Female genitalia, dorsal view. 57. Epigynum. 
Figs. 58-60. C. backstromi (Berland). 58. Female. 59. Female genitalia, 
dorsal view. 60. Epigynum. 
Figs. 61, 62. C. caraca sp. n. 61. Female genitalia, dorsal view. 62. Epigy- 
num. 
Figs. 63-70. C. compressa (Keyserling). 63, 65. Female genitalia, dorsal 
view. 64, 66, 67. Epigynum. 68. Female abdomen, lateral view. 69, 70. Left 
palpus. 
