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Andrena stictigastra Viereck, 1917
Life   Insecta   Hymenoptera   Apoidea   Andrenidae   Andrena

Reprinted with permission of the American Entomological Society from: LaBerge, W. E. 1971b. A revision of the bees of the genus Andrena of the Western Hemisphere. Part IV. Scrapteropsis, Xiphandrena, and Rhaphandrena. Transactions of the American Entomological Society 97: 441-520.

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Described using the synonymous name: Andrena aquila LaBerge

This species, known only from a few females, is very similar to A. biareola in sculpturing but lacks the pronotal humeral angle and has three submarginal cells in the anterior wing. A. aquila can be separated from any of the four foregoing species by the vestiture being entirely dark brown to black, although the tibial scopal hairs may be somewhat paler brown.

FEMALE. MEASUREMENTS AND RATIOS. N = 6; length, about 9 mm; width, about 3 mm; wing length, M = 3.27 0.138 mm; FL/FW, M = 0.95 0.003; FOVL/FOVW, M = 3.43 0.053.

INTEGUMENTAL COLOR. Black with same exceptions as in A. stipator.

STRUCTURE. Antenna, eyes, malar space, mandible and galea as in stipator. Maxillary palpus as in stipator but segmental ratio about 1.0: 1.0: 0.7: 0.7: 0.5: 0.6. Labial palpus as in stipator but ratio about 1.0: 0.6: 0.5: 0.6. Labral process as in stipator but less narrowed apically. Vertex and facial fovea as in stipator. Sculpturing of head as in stipator but ventral genal surface with longitudinal rugae coarser and more distinct, lateral surface without rugulae.

Pronotum normal, as in stipator. Structure and sculpturing of thorax as in stipator except as follows: mesoscutum with posterior declivous area with crowded punctures in five or six rows or more; propodeum with dorsal enclosure with somewhat finer and more irregular rugulae. Venation and legs as in stipator.

Metasomal terga with punctures essentially as in biareola, that is, punctures less coarse and less crowded than in stipator but more so than in buccata. Pygidial plate and sterna as in stipator.

VESTITURE. Entirely dark brown to black; terga without apical fasciae; occasionally (not holotype) tibial scopal hairs paler but at least brown in color.

REMARKS. This form is apt to be considered as a melanistic form or race of one of the previous four species, perhaps stipator or buccata. However, no intergrades exist and the combination of characters listed above makes it difficult to choose between stipator and buccata as the typical form of which aquila would be a variety. It is considered better to keep this form as a separate species until more evidence accumulates.
Reprinted from Viereck, H.L. 1917. Proceedings of the Academy of Natural Sciences of Philadelphia 68(1916): 579. The copyright on this work has expired.

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Type.-No. 4,036. The Academy of Natural Sciences of Philadelphia. Type.- Locality.- Southern California (H.K.Morrison). Presumably related to A. A. fulvinigra Veireck & Ckll.

Female.- Length 9.5mm; body black, covered throughout with bl;ack or blackish brown hairs; head with its facial line: transfacial line:: 57:80, axial line: temporal line:: 30:17, malar line : joint 3 of antennae :: 2:7.5, elevated portion of malar space barely represented, head covered with black or blackish brown hairs, front coarsely striated, fovea at most :ocellocular line:: 10:16, foveal band poorly developed, fovea virtually contigousl to the upper end of the inner eyes margin, distance between fovea and ocelli: ocellocular line:: 5:16, fovea constricted near its middle where it is apparently half as wide as the greatest width of the fovea, the latter continued below the constriction as a shallow depression down to a point apparently on the clypeal line, fovea with dark hair, fovarea wanting, face polished, not so densley punctured as the clypeus, clypeus slightly elevated above the apical margin, convex, shining, covered with distinct adjoining or nearly adjoining punctures, clyperarea exceedingly narrow but extending nearly from base to apex, clypeus thinly hairy with dark hairs, labarea rounded truncate, its width at base: length down the middle:: 3:5, labrarea at base nearly half as wide as the labrum, the latter with a fringe of dark hairs, joint 3 of antennea: 4 5::8:6.5, joint 4 thicker than long, the succeding joints at most a little longer than thick, antennae blackish throughout, mandibles typical, robust, not extending to the outer ridge of the labrum, but slightly overlapping below the middle of the labrum, black except for the apical third which is dark reddish, palpi nearly typical; thorax covered with blackish hairs which are darkest on the dorsulum where they are shorter than the dark brownsh hairs on the mesopleurae, dorsulum dullish, finely recticulated, coarsely punctured, the punctures from nearly adjoing to six puncture widths apart, the punctures mostly sparsely distributed, notauli represented by an impressed shining line, mesopleurae sculptured much like the scutel but more coarsely so, with dark brownish hairs, except along the upper margin where the hairs are blackish, scutel hairy and exceedingly densely punctured, its punctures as close together as possible, metanotum hairy and sculptured like the scutel except that the sculture is apparently not so coarse, tegulae blackish stramineous, with blackish margins, polished, wing base partly blackish brown, membrane with a uniform blackish brown tinge, subcosta blackish brown, stigma bright brownish, rest of veins dull stramineous, with a blackish tinge, first recurrent vein received by the second submarginal cell beyond the middle and nearer to the second transverse cubitus than the first transverse cubitus is to the stigma on the radial cell and forming an acute angle with the second abscissa of the median vein and with the first absciisa of the discodial vein, legs blackish brown except for the claws which are more or less brownish stramineous, legs covered with blackish hairs, scopa typical, its hairs of a blackish brown hue, and concolorus throughout, hind metatarsi at most apparently as wide as mid metatarsi; propodeum with it enclosure well efined, coarsely sculpturd in addition to haivng at least five well-defined longitudinal carinae on each side of a median longitudinal carina, rest of upper face of the propodeum sculptured somewhat like the metanotum but so finely and covered with blackish brown hair, propodeal pleurae shining, delicately reticulated and with sparse shallow punctures, not nearly hidden by the blackish brown floccus; abdomen with its tergum polished, punctured, the punctures clear cut but small and from one to four puncture widths apart on the first tergite, from one to three puncture widths apart on the elevaed portion of the second and third tergites where the punctures are seemingly larger than on the depressed portions and from one to three punture widths aprat on the depressed portions of the second and third tergited, second tergite with its elevated portion down the middle: depressed portion :: 13:6, fourth tergite more sparsely punctured than second and third, fifth tergite with its punctures sparse, ill defined and surrounded by fine reticulations, pygidium dulish, slightly convex, rounded broadly truncate at apex, tergum with inconspicuous blackish hairs, second, third and fourth tergites without a hair band, fimbria blackish brown or dark seal brown. The parts decribed in italics have been destroyed by museum pests, so the italicised points are what will probably be found in a perfect specimen.

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