Cybaeus grizzlyi Schenkel 1950

Figs 25–32, 61–62, 69

Cybaeus adenes Chamberlin & Ivie 1932: 24 (in part, paratypes only). Roth 1956: 178. Roth & Brown 1986: 3

Cybaeus grizzlyi Schenkel 1950: 86, fig. 32. Roewer 1954:90. Bennett 1992: 4, Figs 1–2. Bennett 2006: 485, Figs 40–43. World Spider Catalog 2019.

Cybaeus adenoides Schenkel 1950: 88, fig. 33. Roewer 1954: 89.

Type material. Holotype ♂ of C. grizzlyi . U.S.A.: California: Alameda County, Grizzly Peak, near Berkeley, 5 November 1938, no collector data (NHMB), examined . Lectotype ♀ of C. adenoides . U.S.A.: California: Alameda County, Berkeley Hills, 23 April 1939, no collector data (NHMB), examined. See discussion of type material and synonymy in Bennett (2006) .

Other material examined. Specimens and locality data in Bennett (2006). Note: Castro Valley females number only 4 (not 43 as listed in Bennett 2006).

Diagnosis. The male of C. grizzlyi is diagnosed by the morphology of the proximal arm of the tegular apophysis which is deeply grooved ventrally with a single, blade-like tip and a prominent pointed keel dorsally (Figs 25, 61–62). The keel is absent in the known males of the other adenes group species with a single tip of the proximal arm ( C. amicus: Fig. 56) or is a broad blunt protuberance ( C. auburn: Figs 63–64) and in males of other species with a similar bluntly pointed dorsal keel, the tip of the proximal arm is bifid ( C. adenes: Figs 59–60; C. sanbruno: Fig. 67; C. schusteri: Fig. 65) or trifid ( C. reducens: Fig. 57).

The inverted U-shaped or lyriform atrium, widest anteriorly (Fig. 30), distinguishes the female of C. grizzlyi from females of all other adenes group species except C. adenes (and occasionally C. schusteri). From females of C. adenes this species can evidently only be separated on the basis of locality. Collection of males with females may be the only way to ensure reliable separation of females of C. grizzlyi and C. schusteri with similar atrial morphology. See diagnosis of C. adenes for further discussion.

Description. Femora unbanded.

Male: (n=24). Patellar apophysis (Fig. 26) with about 30 peg setae along anterodorsal surface. Small retrolateral ridge anteriorly on tibia dorsal to carina (Figs 26–27).

(n=16). CL 2.15–2.9 (2.6±0.2), CW 1.63–2.13 (1.90±0.14), SL 1.11–1.45 (1.29±0.09), SW 1.05–1.35 (1.21±0.09). Holotype CL 2.50, CW 1.83, SL 1.36, SW 1.14.

Female: (n=76). (Figs 28–32). Description as for C. adenes .

(n=23). CL 2.00–3.0 (2.4±0.3), CW 1.16–2.05 (1.65±0.24), SL 0.99–1.43 (1.21±0.13), SW 0.93–1.33 (1.13±0.13). Holotype of C. adenoides CL 2.6, CW 1.85, SL 1.30, SW 1.25.

Distribution and natural history. Known only from Contra Costa and Alameda Counties in west central California (Fig. 69) where it is apparently relatively common. At the University of California (Berkeley) campus this species has been collected under logs in eucalyptus groves. Elsewhere it has been found under bark. Males have been collected from mid–October to late December with one record from late April.