Oligoxystre rufoniger

Description. Male (Holotype). Total length: 19.87. Carapace: length 8.12; width 7.14. Eye tubercle: length 1.26; width 1.73. Labium: length 0.64; width 1.3. Sternum: length 4.12; width 3.41. Basal segment of chelicera with 8 teeth. Labium with 9 cuspules. Maxilla with 15 – 21 cuspules. Thoracic furrow straight. Palp: femur 4.81 / patella 3.01 / tibia 4.03 / cymbium 1.64 / total 13.49. Legs I: femur 7.05 / patella 4.24 / tibia 5.61 / metatarsus 5.89 / tarsus 3.13 / total 25.83. II: 6.79 / 3.98 / 5.35 / 5.48 / 3.07 / 24.67. III: 6.01 / 3.05 / 4.58 / 5.35 / 2.95 / 21.94 IV: 7.77 / 3.72 / 6.92 / 7.57 / 3.65 / 29.63. Spines: Palp: femur (d) 0 - 0 - p 1, patella 0, tibia (p) 0 - 0 - 1; Legs: I: femur (d) 0 - 0 - p 1, patella 0, tibia (v) 2 - 2 - ap 1, (p) 1 - 0 - 1, metatarsus (v) 1 - 0 - 0; II: femur (d) 0 - 0 - p 3, patella 0, tibia (v) 1 - 2 - ap 2, (p) 1 - 0 - 1, metatarsus (v) 1 - 0 - ap 1, (p) 0 - 1 - 0; III: femur (d) 0 - 1 - 4, patella 0, tibia (r) 1 - 0 - 1, (v) 1 - 2 - ap 2, (p) 1 - 0 - 1, metatarsus (r) 0 - 1 - 1, (v) 2 - 0 - ap 3, (p) 1 - 0 - 1; IV: femur (d) p 1 - 0 - 4, patella 0, tibia (r) 1 - 1 - 1, (v) 2 - 2 - ap 2, (p) 1 - 0 - 1, metatarsus (r) 0 - 1 - 1, (v) 2 - 0 - ap 3, (p) 0 - 1 - 1. Retrolateral lobe of cymbium slightly larger than prolateral lobe. Male palpal bulb long, thin and slightly curved at its distal end (Figs. 35 – 36). Retrolateral branch of tibial spur with spine inserted at its midlength, prolateral branch smaller than adjacent spine (Fig. 34). Metatarsus I slightly curved, does not touch tibial spur when flexed. Carapace reddish. Abdomen dark. Legs reddish on basal region (trochanter and femur) and dark distally (patella, tibia, metatarsus, and tarsus) (Fig. 39). Female (Paratype IBSP 8553). Total length: 32.4. Carapace: length 10.96; width 9.52. Eye tubercle: length 1.6; width 2.29. Labium: length 1.01; width 1.93. Sternum: length 5.49; width 4.37. Basal segment of chelicera with 9 teeth. Labium with 3 cuspules. Maxilla with 25 – 26 cuspules. Thoracic furrow straight. Palp: femur 5.7 / patella 3.81 / tibia 3.41 / tarsus 3.71 / total 16.63. Legs I: femur 7.7 / patella 5.28 / tibia 5.8 / metatarsus 5.09 / tarsus 2.93 / total 26.8. II: 7.24 / 4.83 / 5.28 / 4.76 / 3 / 25.11. III: 6.59 / 3.91 / 4.69 / 5.15 / 3 / 23.34. IV: 8.36 / 4.62 / 7.38 / 7.46 / 3.32 / 31.14. Spines: Palp: femur (d) 0 - p 1 - p 1, patella 0, tibia (v) p 1 - 2 - ap 2, (p) 0 - 1 - 0; Legs: I: femur (d) 0 - p 1 - p 1, patella 0, tibia (v) 1 - 1 - ap p 1, (p) 0 - 1 - 1, metatarsus (v) 1 - 0 - ap 1; II: femur (d) 0 - p 1 - p 1, patella 0, tibia (v) 1 - 1 - ap p 1, (p) 1 - 1 - 0, metatarsus (v) 1 - 0 - ap 1, (p) 0 - 1 - 0; III: femur (d) 0 - p 1 - 2, patella 0, tibia (r) 0 - 1 - 1, (v) 0 - 2 - ap 2, (p) 1 - 2 - 0, metatarsus (r) 1 - 1 - 0, (v) 1 - 0 - ap 3, (p) 0 - 1 - 1; IV: femur (d) 0 - 0 - 2, patella 0, tibia (r) 0 - 1 - 1, (v) 0 - 2 - ap 2, metatarsus (r) 0 - 1 - 1, (v) 0 - 2 - ap 3, (p) 0 - 1 - 1. Spermathecae paired, receptaculum long, apical lobes, and small basal lobe towards outside (Fig. 37). Coloration as in male.

Types. Holotype. Male (MZSP 20570), Estação Ecológica Uruçuíma, Piauí, Brazil. Paratypes: Female (IBSP 8553), Toca da Esperança, Central, Bahia, Brazil, A. D. Brescovit et al. leg., VII. 2000; female (MZSP 18986), Morro do Chapéu, Bahia, Brazil, G. Skuk leg., 3. X. 1990; female (MZSP 9510), Central, Bahia, Brazil, E. F. Ramos leg., 15 – 20. VII. 1997.

Diagnosis. May be distinguished by coloration of the legs: reddish on basal region and dark on distal end (Fig. 39). Males may be distinguished by having bulb long, thin, and slightly curved in distal portion (Figs. 35 – 36). Females may be distinguished by long spermathecae receptaculum, with lobes on distal end and a small basal lobe towards outside (Fig. 37).

Etymology. The specific name is combined from the Latin words for red and black, for the coloration of the legs, red in the proximal portion and black in the distal portion (fig. 39).

Additional material examined. BRAZIL. Bahia: Central, 1 Ψ (IBSP 9509), 1 Ψ (IBSP 9510), 1 Ψ (IBSP 9857); Jacobina, 1 Ψ (MZSP 18980); Rio de Contas, 1 Ψ (IBSP 9511), 1 Ψ (IBSP 9512); São Dezidério, 1 Ψ (IBSP 8715), 1 j (IBSP 9854). Paraíba: São José da Mata, 1 Ψ (IBSP 9513).