Reprinted from: Broemeling, D.K. 1988 A Revision of the Nomada Subgenus Nomadita of North America (Hymenoptera: Anthophoridae). The Pan-Pacific Entomologist 64; 333-334
Holotype, male: "Baldwin Lake, Cal., Sept. 1. 36, Timberlake Coll.,". Allotype, female: "Valley of the Falls, Cal., Sp.7.35 nr. Eriogomun subscaposum, Timberlake Coll." Type Depository, University of California, Riverside.
Diagnosis: Differs from aquilarum, mutans and snowii by having bright yellow in¬stead of white maculations. Differs from placida by having complete transverse ma¬culations on all abdominal terga. Differs from verecunda by having a prominent, dull scutellum (as opposed to flattened, sparsely punctate and highly polished), and the apex of the pronotal ridge is rounded. A difference in reflectivity of the abdominal terga is the best (but most difficult to describe) character for differentiating timberla¬kei from verecunda. The abdominal terga of timberlakei are closely punctate, shining a bright light upon the yellow portions of the abdomen will produce a diffuse reflec¬tion, giving the tergum a dull appearance. This same light will produce a sharp, circu¬lar reflection on verecunda. Nomada timberlakei has much closer punctation on the terga, with a dull interpunctural surface. Nomada verecunda has more widely spaced punctation (1 to several puncture widths apart) and a polished interpunctural sur¬face. The yellow abdominal maculations of timberlakei are usually lighter colored than verecunda"s.
Males: Length 6.7-10.4 mm, forewing length 5.1-6.7 mm, hindwing length 3.7-5.2 mm; scape densely punctured with smooth shiny IPS; IOD 0.45 mm, OOD 0.38 mm, MLOD 0.17 mm, MOD 0.20 mm, MOOM 0.46 mm; pre-occipital ridge present, not sharply angulate; sub-apical transverse ridge of labrum broken into 5 teeth; acetabular carina strong, lamellate; pre-lobar carina strong, sloping gently; pronotal ridge not angulate apically, depressed medially; scutal punctures with sharply angulate rims; tegulae sparsely punctate, glassy; scutellum bilobate; metano-tum somewhat laterally inflated; supraspiracular ridge not prominent; metapleuron punctate; pro-coxal spine rudiment absent; hind tibial apex with 3 short anterior bris¬tles, one long posterior bristle, fuscous, in strong contrast to yellow tibiae; yellow bands on abdomen not highly reflective: COLOR: anterior of scape, first flagellar segment, supraclypeal area (except subantennal sutures), clypeus, sides of face up to apex of compound eyes, malar space, labrum, basal two-thirds of mandibles, sub¬mandibular area and broad band extending halfway to vertex behind eyes, pronotal ridge and lobes, tegulae, axillary sclerites in part, mesopleuron except epimeral and posterior areas, posterior medial patch on meso- and metasternum, scutellum, me-tanotum, coxae (except bases), trochanters in part, femora (except basal areas), fore- and mid-tibiae, hind-femora (except medial annular ring), tarsi, extensive transverse medial bands on all terga, large patch on first sternum, almost all of re¬maining sterna, bright lemon yellow; remainder of body dark brown to black.
Females: Length 6.7-8.9 mm, forewing length 4.7-6.1 mm, hindwing length 3.7-4.7 mm; very similar to males, except with more extensive yellow markings.
Discussion: This species is difficult to separate from verecunda. It has frequently been misidentified as that species. Nomada verecunda is found in the mountains of northern California, Nevada, and southern Oregon. Nomada timberlakei has only been found in central and southern California.
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