Type Material

            Holotype: "Male holotype from Baja California Norte, Mexico, 2 miles east of Ranch San Salvador along road to Valle Trinidad from Ensenada; 21 June 1973; coll. S.C. Williams & K.B. Blair, SCW # 314(4) (CAS). Female allotype from 10.2 km north of Santa Maria, Baja California, Mexico (CAS). Examined male holotype but was unable to examine female allotype" (Cushing et al., 2018).

            Measurements: Male Holotype: TL 21.0; CL 5.5; CH 2.3; FNL 0.3; FNH 0.6; FFH 0.9; PL 19.2; PT 1.8; PMT 7.0; LI 16.0; LIV 25.0; PPL 4.2; A/CP 6.2; FNL/FNH 0.5; FFH/FNH 1.5.

            Chelicera Description: Male: "VDC deep, occupying approximately half the length of fixed finger (Fig. 1A), narrower than E. calexicensis (Fig. 1B). Thin, straight fixed finger with no median dentition; movable finger: MP-MSM-MM (a tiny medial tooth or ridge); MPL distinct (Figs. 2A & B). Fondal notch short; three RFA; fondal teeth graded II, I, III, IV retrolaterally and I, III, II, IV prolaterally (Fig. 3A)" (Cushing et al., 2018).

Female: "Fixed finger: FP-2 FSM (posterior being larger)-FM-smaller FSD-FD; Movable finger: MP-2 MSM-MM; MPL distinct (Fig. 2C & D). Two RFA proximal to FP; fondal teeth graded II, I, III, tiny IV retrolaterally and I, III, II, IV prolaterally" (Cushing et al., 2018).

            Genital Operculum: "All of the females examined match Muma’s illustration (1987, p. 25, fig. 12) with long, curved anterior arms widening at the posterior wing (Fig. 4A). None had the pits on the anterior arms as illustrated in Muma’s fig. 11" (Cushing et al., 2018).

Diagnosis: The male chelicera of Eremocosta bajaensis is similar to that of E. calexicensis. "It is distinguished by the much smaller and more ridge-like (rather than tooth-like) MM of the movable finger of E. bajaensis (compare Fig. 2A and E), a short but distinct fondal notch; color pattern of propeltidum (compare Fig. 5A and B), with E. bajaensis having a darker anterior edge; and color of appendages. Female genital operculum wings thin and curved (Fig. 4A) and very different from that of E. calexicensis (Fig. 4B)" (Cushing et al., 2018).

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