Psilochorus inyo, Slowik, Jozef, 2009

Slowik, Jozef, 2009, A review of the cellar spider genus Psilochorus Simon 1893 in America north of Mexico (Araneae: Pholcidae), Zootaxa 2144, pp. 1-53 : 28-30

Psilochorus inyo new species

Figs. 92–98, 191

Type. ɗ holotype, 2 ɗ paratypes, from Beveridge Canyon (36.72 N 117.84 W), Inyo County, California, USA; 20-Aug-1976, NHMLA.

Further paratypes. 9 ɗ; USA, California, 1 ɗ, Sand Dune, Saline Valley, 04-May-1976, NHMLA; 1 ɗ, Sand Dune, Saline Valley, 15-Aug-1976, NHMLA; 1 ɗ, 7 mi SW of Death Valley Jct, 16-Jan-1981, CAS; 1 ɗ, 1 mi W Coso Peak, China Lake NAWS, G Prati, 27 May-8 June 1996, EM; Kern County, 1 ɗ, nr Freeman, Ivie, 06-Aug-1931, AMNH; 1 ɗ, Dove Springs 1, array 15, USGS San Diego, 01-Jun-2004, DMNS; Mono County, 2 ɗ, Benton, 04-Aug-1942, AMNH; San Bernardino County, 1 ɗ, ZZYZX Spring, 22-Apr-1977, EM.

Etymology. The specific epithet, regarded as a noun in apposition, refers to the county of the type locality.

Diagnosis. Specimens may be identified by: male spur long and straight, end rounded or slightly bulbous (Figs. 92, 93), procursus long, with a bifurcate end, ventral end extending beyond the dorsal end (Figs. 97, 98). Mature females are not known.

Male: (Holotype) (Figs. 92, 94–95, 97) Total length: 2.37; carapace length: 1.01; carapace width: 0.92; leg 1: 19.72 (5.63 + 0.43 + 5.72 + 6.67 + 1.31); tibia 2: 3.96; tibia 3: 3.12; tibia 4: 3.98. 22 leg I tarsal segments; femur1/carapace length: 5.57; RT at 12.4%; DT at 7.3%. Color typical for the genus. Spur large, located on the proximal half of the chelicera (Fig. 94), almost straight in dorsal view, end rounded (Fig. 92). Procursus distal area slightly swollen, bifurcate, ventral end pointed, ventral end square, extending past dorsal (Figs. 97). Bulb apophysis triangular, originating from the center of the bulb, retrolateral tab small, extending to midlength of bulb apophysis (Fig. 95).

PLATE 12. Figures 92–98. Psilochorus inyo new species. 92, 94–95, 97. Male holotype, 93, 96, 98. Male paratype. 92–93. Dorsal view of chelicerae. 94. Lateral view of chelicerae. 95–96. Dorsal view of bulb apophysis. 97–98. Lateral view of procursus.

Variation: (N=3) Total length: 2.11 ± 0.24; carapace length: 0.93 ± 0.08; carapace width: 0.94 ± 0.21; leg 1: 17.64 ± 2.97 (4.91 ± 0.88 + 0.40 ± 0.03 + 5.25 ± 0.76 + 5.92 ± 1.12 + 1.16 ± 0.19); tibia 2: 3.31± 0.56; tibia 3: 2.70 ± 0.47; tibia 4: 3,64 ± 0.48. 20–22 leg I tarsal segments; femur1/carapace length: 5.27 ± 0.61; RT at 12.4–13.0%; DT at 6.8–7.5%.

Remarks. This spider shares regions with both P. hesperus and P. u t a h e n s i s in which it can be separated by the truncate spur ends. Females collected from the same locales and with conspecific males appear similar to P. rockefelleri ; however, upon dissection none were found to have any internal genitalic features, indicating they are penultimate. Because no mature females were found a description is not provided. Distribution. Central to Southeast California.

PLATE 13. Figures 99–107. Psilochorus pallidulus Gertsch. 99–103. Male. 99. Dorsal view of chelicerae. 100. Lateral view of chelicera. 101–102. Dorsal view of bulb apophysis. 103. Lateral view of procursus. 104–107. Epigynum. 104. Anterior view. 105. Ventral view. 106. Posterior view. 107. Lateral view.