Andrena (Trachandrena) hadfieldi, Sheffield, 2020

Sheffield, Cory S., 2020, A new species of Andrena (Trachandrena) from the Southwestern United States (Hymenoptera, Andrenidae), Journal of Hymenoptera Research 77, pp. 87-103 : 87

Andrena (Trachandrena) hadfieldi sp. nov.

Material examined.

Holotype female, USA, Arizona, Santa Cruz Co., Patagonia Sonorita Creek Reserve , 31.53N, 110.77W, 14.iv.1994, M[alaise] T[rap], B. Brown & E. Wilk / Royal Saskatchewan Museum Entomology RSKM_ENT_E-219414. The single specimen is housed at the Royal Saskatchewan Museum (RSKM) in Regina, Saskatchewan, Canada. The dataset for Andrena hadfieldi is archived with Canadansys (http://community.canadensys.net/) under resource title "A new Trachandrena from the Southwestern USA" and can be accessed using the following: https://doi.org/10.5886/em2mri.

Diagnosis.

The female of Andrena hadfieldi is unique among Trachandrena in the Nearctic region in having very wide (i.e., at least 2/3 of the median tergal length) marginal zones of T2-T4 which are shiny and impunctate (Fig. 2D ), a feature shared only with A. cleodora (Viereck) (Fig. 2C ). Andrena hadfieldi is smaller than A. cleodora (9 mm, versus 10-13 mm body length in A. cleodora ), and differs from A. cleodora in having the terga black (Fig. 2D ) instead of black with strong metallic bluish reflections (Fig. 2C ), and in having entirely pale pubescence, including the scopa (Figs 6 , 7 ); the hair on the metasoma (Fig. 2C ) and scopa of A. cleodora are black, and the pubescence of the dorsum of thorax is yellowish to red (subspecies Andrena cleodora cleodora ; widespread in western North America) or entirely black (subspecies Andrena melanodora melanodora Cockerell; known from southern California). The structure of the pubescence on the dorsum of the thorax also differs between these two species, being long, very thin, and weakly plumose in A. hadfieldi (Fig. 6 ), but shorter and densely plumose, almost scale-like, in A. cleodora (Fig. 8 ). The process of the labrum in A. hadfieldi is more than 3 × as wide basally as long medially (Fig. 9A ); in A. cleodora the labral process is larger, subtriangular, with the base 2.5 × as wide as the medial length (Fig. 9B ). The body surface sculpture of A. hadfieldi is much finer than for A. cleodora ; as examples, the face of A. hadfieldi is generally more finely and sparsely punctate, with shiny interspaces> two pd on the lower paraocular area (Fig. 10A ), while in A. cleodora the lower paraocular area is more coarsely and closely punctate (interspaces <pd) (Fig. 10B ); the surface of the propodeal corbicula is smooth with a few short rugae in A. hadfieldi (Fig. 11A ), while coarsely rugose in A. cleodora (Fig. 11B ).

The male of A. hadfieldi is unknown.

Description.

Holotype, female (Figs 6 , 7 , 9A , 10A , 11A , 12 ). Body length 9 mm; head length 1.9 mm; head width 2.5 mm; intertegular width 2.1 mm; fore wing length 6.9 mm.

Colour. Black except as follows: F3-F10 dark reddish-brown below; tegula moderately translucent, brown, becoming reddish brown in posterior half; wing membranes slightly infumate, veins yellowish-brown; legs dark brown, apical tarsal segments reddish brown.

Structure. Labrum with process trapezoidal, more than three times as wide at base as long medially, apical edge entire (Fig. 9A ). Clypeus with coarse, close round to irregular shaped punctures, becoming finer apically, interspaces shiny and linear, less than 0.5 pd, without obvious median impunctate line but with a small shiny subapical boss extending for less than 1/5th median length of clypeus (Fig. 10A ). Supraclypeal area with distinct round punctures separated by 0.5 pd, surface rather shiny (Fig. 10A ). Mandible short, extending beyond middle of labrum by about ¼ its length in repose. Malar space extremely short (Fig. 10A ). Lower paraocular area shiny with small punctures separated by> two pd (Fig. 10A ). Face above antennal socket with rugulae extending to ocelli, without obvious punctures. Facial fovea long, extending from middle level of lateral ocellus to basal edge of clypeus; lower portion narrow, from below level of antennal socket about 1/3 as wide as upper portion, outer edge slightly incurved from inner margin of compound eye just above level of antennal socket, this area smooth, shiny and impunctate (Fig. 10A ). Compound eye just over three times as long as broad in frontal view, inner margin converging slightly toward mandibles. Genal area in profile about as broad as compound eye, surface shiny with minute punctures separated by 2 pd, posterior half dull with reticulate shagreening, without apparent punctures except near base of mandible. Vertexal area above lateral ocellus subequal to one ocellar diameter, dulled by crowded punctures and dense reticulate shagreening. Antennal scape length equal to combined length of F1-F3; F1 about 1.5 times as long as broad at apex, and 1.5 times longer than F2; F2-F5 quadrate, F6-F9 about 1.2 times longer than broad, F10 more elongate, about 1.5 times longer than broad.

Pronotum somewhat shiny, with distinct punctures dorsally, separated by about two pd, laterally mostly impunctate with surface somewhat dull. Mesoscutum with large, round deep punctures, between parapsidal lines and posteromedially separated mostly by ½ to one pd, anteriorly and laterally separated by less than ½ pd, becoming somewhat rugosopunctate along anterior edge (Fig. 7 ), surface dull, reticularly shagreened. Scutellum similarly punctured though punctures slightly sparser anteriorly, and surface mostly shiny. Metanotum dull and tessellate laterally, becoming somewhat shiny and punctate medially. Metapostnotum with rather shallow but distinct rugae, these somewhat irregular (Fig. 12 ); dorsolateral and posterior surfaces of propodeum moderately coarsely rugosopunctate, tessellate, dull; propodeal corbicular surface moderately shiny, tessellate, with a few short rugae (Fig. 11A ). Mesepisternum coarsely rugose and somewhat shiny. Metepisternum surface smooth, with a slight shine. Fore femur with base round in outline. Posterior hind tibial spur straight. Tarsal claws with a small subbasal tooth.

T1 shiny and largely impunctate, with basal area (= disc) punctures obscure, shallow, sparse, separated by ≥ 5pd; marginal zone impunctate and shiny, occupying about 3/5th of median length of tergum, a few sparse minute punctures visible at extreme lateral edge, surface smooth (Fig. 2D ). T2 with marginal zone clearly longer than basal area (about 3/4th medial with); basal area shiny with punctures separated by one pd, a narrow dull impunctate area adjacent to gradulus; marginal zone smooth, shiny and impunctate (Fig. 2D ). T3-T4 similar to T2 but marginal zone of T4 shorter, about 3/5th of median length of tergum (Fig. 2D ). T5 with basal area broader than marginal zone, basal area tessellate, with distinct punctures separated by 2-3 pd, becoming closer adjacent to marginal zone (Fig. 2D ); marginal zone dull, largely obscured by prepygidial fringe (Fig. 2D ). Pygidial plate U-shaped with rounded apex about ½ as wide as base, with sharply pointed, internal, raised triangular area on median surface. S2-S5 with surface somewhat shiny, punctures uniformly dense, separated by 1 pd; S2 with a medial U-shaped depression.

Vestiture. Generally white to pale yellowish (Figs 6 , 7 ), somewhat reddish on mandible and apical margin of labrum. Propodeal corbicula with long plumose hairs on dorsal and posterior edges, lacking anterior hairs, with long simple hairs internally (Fig. 11A ). Trochanteral flocculus complete. Tibial scopal hairs long and simple. Prepygidial fimbria and T6 with reddish brown hairs (Fig. 2D ). Terga lacking apical fasciae except reduced to small lateral patches of sparse hairs on T2 and T3 (Fig. 2D ); a few long pale subappressed hairs arising laterally from the premarginal line and overlaying marginal zone (Fig. 2D ). T1 with sparse pale hairs laterally and on declivitous anterior surface (Fig. 2D ). S2 to S5 with sparse, pale, elongate plumose hairs apically, these becoming longer laterally (i.e., ½ length of succeeding segment).

Male unknown.

Distribution.

United States, southern Arizona.

Etymology.

It is a privilege to name this new species after Canadian astronaut Col. Chris Hadfield for his many achievements as a pilot, astronaut, author, lecturer, and science educator.

Figures

Figure 2. Dorsal surface of metasoma of female Trachandrena. A Andrena rugosa, the type species of the subgenus, with relatively wide apical impressed area of T 2; B A. hippotes Robertson, with a relatively narrow apical impressed area of T 2 (but still wider than basal area); C A. cleodora (Viereck); D A. hadfieldi, nov. sp. Both of the latter species have broad apical impressed areas of T 2 which are impunctate.

Figure 6. Holotype female of Andrena (Trachandrena) hadfieldi. Lateral view.

Figure 7. Holotype female of Andrena (Trachandrena) hadfieldi. Dorsal view.

Figure 8. Dorsal thoracic surface of Andrena (Trachandrena) cleodora, showing the short, thick pubescence.

Figure 9. Labral process of A Andrena (Trachandrena) hadfieldi, and B A. (Trachandrena) cleodora.

Figure 10. Face of A holotype female of Andrena (Trachandrena) hadfieldi, and B A. (Trachandrena) cleodora.

Figure 11. Propodeal corbicula of A Andrena (Trachandrena) hadfieldi showing long plumose hairs on the dorsal and posterior surface, no hairs on the anterior margin, and long simple internal hairs, and the rather smooth surface, and B A. (Trachandrena) cleodora, with the surface coarsely rugose.

Figure 12. Holotype female of Andrena (Trachandrena) hadfieldi. Dorsal view, propodeal enclosure.