Vaejovis mcwesti Sissom, Graham, Donaldson & Bryson Jr., 2016

Figures 4, 13j, 14i, 15j, 16j, 17j, 18j, 19j, 28

Vaejovis mcwesti Sissom, Graham, Donaldson & Bryson Jr.; 2016 5–8; Figs 21–39.

Type material. Holotype male. MEXICO: Durango, Hwy 36, km 32, between San Andres Atotonilco and Laguna La Chaparra (W Santiago Papasquiaro)(N 25.07565°, W 105.61933°, elev: 2787 m). VIII.11.2005. Cols: O. F. Francke, W. D. Sissom, K. J. McWest, C. M. Lee, H. Montaño, J. Ballesteros, L. Jarvis, and C. Duran. (CNAN). Examined.

Paratypes. 2 ♀, same data as holotype (AMNH), examined; 2 ♀, same data as holotype (CNAN), examined; and 1 ♀, same data as holotype (CAS), not examined .

Diagnosis. Adults 23 to 33 mm long (Fig: 28-ab). Carapace (Fig: 13-j), shorter than metasomal segment V (Carapace L/MS-V 0.88 [0.96±0.05]), longer than femur (Carapace L/Femur L 1.32 [1.25±0.03]); anterior margin of carapace concave. Mesosomal tergite VII with a pair of well developed, granular carinae present from middle of segment and never reaching posterior margin. Pectinal teeth 14–14 [12–14]; sternite V on male with a conspicuous bright semi-oval whitish patch at posterior margin; sternite VII with a pair of vestigial paramedian carinae and 12 setae [12]. Metasomal segment I sub-quadrangular in dorsal view (MSI L/ W 0.76 [0.70±0.03]); intercarinal spaces on segments I–IV smooth, may present some scattered granules; segment V with noticeably darker coloration than rest of metasoma. Vesicle slender (Fig: 14-j) (L/ W 1.70 [1.70±0.05]) and thin (W/D 1.26 [1.31±0.7]), ventral surface smooth; with two submedian longitudinal lighter bands, slightly differentiated in color; dorsal surface smooth and flat, with a long and wide (almost as wide as vesicle) whitish vesicular gland. Pedipalp femur (Fig: 15- j) and patella (Fig: 16-j) always less than three times longer than wide (Femur L/ W 2.90 [2.70±0.06]; Patella L/ W 2.78 [2.71±0.2]); patella dorsointernal carina granulose, composed by a single, continuous row of granules. Pedipalp chela (Fig: 17, 18-j) on male greatly inflated; about one-and-a-half times longer than wide (CM L/ W 1.44 [1.53±0.1]), keel-less, smooth. Pedipalp chela dentate margin of fingers straight.

Hemispermatophore (Fig: 19-j): Lamelliform (TL 3.1; LL 1.8; LW 0.3 mm); lamella simple with hooks located basally, lobed, accessory hook merged to principal lobe and not well differentiated; wider at level where hooks are located; apical crest present on distal third of lamella. Median lobe present, well-sclerotized.

Full morphometric variation is given in tables 13 and 14. Setae variation is given in tables 9–12.

Distribution. This species is only known from the type locality (Figure 4).

Natural history. There is not much information regarding the history of this species, but it is known to live on the pine-oak forest in the Mexican state of Durango, and can be found under rocks and logs.