Reprinted with permission of the University of Nebraska State Museum from:|
LaBerge, W. E. 1967. A revision of the bees of the genus Andrena of the Western Hemisphere. Part I. Callandrena (Hymenoptera: Andrenidae). Bulletin of the University of Nebraska State Museum 7: 1-316.
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This species, known from three females from Mexico, is closely related to A. simulata. It is similar to the female of simulata in the wing venation, the facial foveal shape and the labial process. It differs from the female of simulata in the facial rugulae which are weak and scarcely visible, the mesoscutal and scutellar punctures which are scarcely visible due to their shallowness and the dense tessellation, the dorsal propodeal enclosure which is finely tessellate, not rugulate, and the moderately shagreened tergal surfaces.
FEMALE. MEASUREMENTS AND RATIOS. — N = 1; length, above 9 mm; width, about 3 mm; wing length, about 3.21; FL/FW, 1.12; FOVL/FOVW, 3.05.
INTEGUMENTAL COLOR. — Black except as follows: mandible with apical two-thirds rufescent; flagellar segments 3-10 dark brown below; tegulae translucent, dark reddish-brown; wing membranes hyaline, slightly infumate, veins brown; terga 1-4 narrowly hyaline apically, terga 1 and 2 with small oval lateral rufescent areas just basad of hyaline areas; sterna narrowly hyaline apically; distitarsi and hind basitarsi orange basally; tibial spurs pale yellow.
STRUCTURE. — Antennae moderately long, scape equal to flagellar segments 1-3; flagellar segment 1 slightly longer than segments 2 Bus 3; segments 2 and 3 subequal in length and each distinctly shorter than 4. Eye about three and three-fourths times as long as broad, inner margins converging extremely slightly towards mandibles. Malar space, mandibles and galea as in simulata. Maxillary palpus as in simulata but segmental ratio about 1.1:1.0:0.7:0.6:0.5:0.7. Labial palpus as in simulata but segmental ratio about 2.8:1.0:1.0:1.3. Labral process trapezoidal in outline, about three times as long as broad, extremely slightly emarginate medially, Clypeus and supraclypeal area as in simulata but clypeal punctures of irregular size and clypeus moderate-dulled by reticular shagreening at least peripherally. Genal area as in simulata but in profile only slightly broader than eye. Vertex above lateral ocellus equals distinctly less than one ocellar diameter, sculptured as in simulata. Face above antennal fossae with rugulae obscured by dense tessellation and punctures, distinctly visible only immediately above fossae and near facial foveae. Facial fovea deep, extending down to level of upper margin of antennal fossa, slightly narrowed below, rounded above and separated from lateral ocellus by about three-fourths an ocellar diameter; foveae converge towards ocelli.
Pronotum as in simulata. Mesoscutum and scutellum opaque, punctures large and extremely shallow, scarcely visible due to coarse, dense tessellation; parapsidal line short as in simulata. Tegulae normal, impunctate. Propodeum with dorsal enclosure tessellate; without rugulae; dorsolateral and posterior surfaces with sparse shallow punctures obscured by coarse dense tessellation; corbicular area as in simulata. Mesepisternum with shallow but distinct punctures separated mostly by one puncture width or more and coarse tessellation dulling surface. Metepisternum similar to corbicular area below, finely punctate and shagreened in upper third. Middle basitarsus and wing venation as in simulata. Claws and tibial spurs normal.
Metasomal tergum 1 with minute punctures separated mostly by two to three puncture widths, surface dulled by fine reticulotransverse shagreening. Terga 2-4 with minute punctures separated mostly by one puncture width, surface dulled as in tergum 1. Pygidial plate broad basally, V-shaped, apex acute, with small raised internal triangle. Sterna 2-5 as in simulata.
VESTITURE. — Generally as in simulata with the following differences: metasomal tergum 2 with apical fascia narrowly interrupted medially; tergum 3 with fascia complete, uninterrupted; metasomal fasciae and long hairs of terga 5 and 6 whitish; basitarsi with hairs entirely pale.
TYPE MATERIAL. — The female holotype (SECK) from 4 miles south of Saltillo, Nuevo Leon, Mexico, was collected by the University of Kansas Mexican Expedition, September 7, 1962, on Encelia farinosa. Two female paratypes (UCB; INHS) from Mexico are as follows; 1 female, 10 miles north of Apizaco, Tlaxcala, August 20, 1962, K. U. Mexican Expedition; 1 female, 5 miles south of Zacatecas, Fresnillo, August 7, 1954, E. G. Linsley, J. W. MacSwain and Ray F. Smith. Remarks. The paratype female from Apizaco is a mosaic caused by stylopid parasites. The hind legs are more male-like than female-like and the clypeus has a narrow subapical band of yellow. However, in general this specimen is more female-like than otherwise and most of the specific characters appear normal.