Smithsonian Institution, Entomology Department · 9
Andrena pecosana, female, face |
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Smithsonian Institution, Entomology Department · 9
Andrena pecosana, female, side |
Smithsonian Institution, Entomology Department · 9
Andrena pecosana, female, top |
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Smithsonian Institution, Entomology Department · 1
Andrena pecosana, face |
Smithsonian Institution, Entomology Department · 1
Andrena pecosana, side |
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Smithsonian Institution, Entomology Department · 1
Andrena pecosana, top |
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Overview |
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 medium-sized species is similar to A. vulpicolor in several respects and belongs near the helianthi group of species although it is not closely related to any one of these. The female of pecosana can be distinguished from that of vulpicolor by the smaller trapezoidal emarginate labral process, the distinct apical fascia on the first tergum and the dark legs. The male of pecosana is easily separated from that of vulpicolor by the bidentate labral process and the distinct parocular yellow maculae.
FEMALE. MEASUREMENTS AND RATIOS. — N = 20; length, 11-13 mm; width, 3-4 mm; wing length, M = 3.77 ± 0.165 mm; FL/FW, M = 1.04 ± 0.009; FOVL/FOVW, M = 3.32 ± 0.057.
INTEGUMENTAL COLOR. — Black except as follows: mandible with at least apical half rufescent; flagellar segments 2-10 rufescent below; tegulae testaceous; wing membranes hyaline, colorless, veins red; terga 1-4 extremely narrowly hyaline apically; sterna 2-5 narrowly hyaline apically, yellowish; tarsi rufescent, occasionally hind tibiae and femora dark rufescent.
STRUCTURE. — Scape length subequal to flagellar segments 1-3 or slightly longer; flagellar segment 1 longer than segments 2 plus 3; segment 2 subequal to 3 and 3 distinctly shorter than segment 4; segments 4-10 longer than broad. Eye about four times as long as broad, inner margins parallel. Malar space, mandibles and galeae as in helianthi. Maxillary palpus as in helianthi but segmental ratio about 1.0:0.7:0.6:0.6:0.5:0.7. Labial palpus as in helianthi but segmental ratio about 2.5:1.0:0.9:1.1. Labral process long, about twice as broad as long, trapezoidal, apex emarginate, often strongly bidentate. Clypeus evenly rounded from side to side, produced beyond ends of clypeus by less than half to about one-third its median length; punctures of moderate size, round, usually absent or sparse along midline, laterally separated by one-half to one puncture width, surface shiny, shagreened only peripherally. Supraclypeal area with minute punctures and reticular shagreening dulling surface. Genal area in profile slightly broader than eye; with minute to small punctures separated mostly by one-halt to one puncture width, more crowded near eye margin, surface moderately shiny and shagreened posteriorly, shiny near eye. Vertex above lateral ocellus equals about one and one-half ocellar diameters; with crowded round punctures above ocelli, compound eyes and facial fovea, sparse in small area laterad of lateral ocelli, with a few rugulae entering from facial area to end above foveae on vertex, surface dulled by fine reticular shagreening. Face above antennal fossae with longitudinal rugulae, interrugal spaces with crowded punctures. Facial fovea extending below to or almost to level of posterior margin of clypeus, rounded above, shallow, separated from lateral ocellus by three-fourths to almost one ocellar diameter.
Pronotum normal, with minute, sparse, indistinct punctures and coarse reticular shagreening dulling surface. Mesoscutum and scutellum opaque, with round shallow punctures separated by one to two puncture widths, barely discernible, obscured by coarse dense tessellation. Tegulae impunctate. Metanotum like scutellum but punctures more crowded. Propodeum with dorsal enclosure irregularly and finely rugulose basally, tessellate; dorsolateral and posterior surfaces sculptured like scutellum but tessellae coarser, longitudinal sulcus of posterior surface narrow, margins not carinate; corbicular surfaces moderately shiny, with small punctures scattered throughout but crowded anterodorsally, with coarse reticular shagreening. Mesepisternum with small shallow punctures separated mostly by two puncture widths, surface dulled by tessellation. Metepisternum with upper third finely punctate and tessellate, lower portion as in corbicular area. Middle basitarsus slightly broader than hind basitarsus medially, with evenly curved sides. Tibial spurs and claws normal. Front wing venation as in helianthi.
Metasomal terga 1-4 with narrow apical areas impunctate; subapical areas (beneath pale fasciae) with minute crowded punctures; basal areas with minute sparse punctures obscured by fine, regular tessellation dulling surfaces. Pygidial plate V-shaped, broad basally, with narrow, rounded apex. Sterna 3ó5 with apical areas impunctate, basal areas with abundant punctures somewhat sparser posteriorly, surfaces shiny to moderately shiny, delicately shagreened.
VESTITURE. — Generally pale ochraceous to white, darker on vertex and thoracic dorsum. Terga 1-4 with apical fasciae, often eroded on tergum 1 medially, but subapical band of punctures present; basally with short suberect pale hairs scarcely hiding surfaces; terga 5 and 6 with long white to ochraceous hairs. Sterna 3-5 with subapical fimbriae of long suberect hairs, basally with short erect hairs. Pollen collecting hairs as in helianthi but internal corbicular hairs plumose. Inner surfaces tarsi golden-yellow.
MALE. MEASUREMENTS AND RATIOS. — N = 20; length, 10-13 mm; width, 2.5-3.5 mm; wing length, M = 3.53 ± 0.046 mm; FL/FW, M = 1.09 ± 0.007; FS1/FS2, M = 1.84 ± 0.024.
INTEGUMENTAL COLOR. — Black except as follows: mandible with apical half or more rufescent; flagellar segments 2-11 and often apex of 1 red below; clypeus yellow except testaceous apical margin and usually small dark maculae below and mesad of tentorial pits; parocular area with small yellow macula extending up no further than to level of lower margin of tentorial pit; supraclypeal area occasionally with small yellow macula; tegulae testaceous; wing membranes hyaline, colorless, veins dark red; terga 1-5 with apices hyaline, narrowly rufescent just basad of hyaline margins; sterna 2-5 rather broadly hyaline apically, yellow; tarsi orange to red; tibiae often and femora occasionally dark rufescent.
STRUCTURE. — Antennae short, extending back to scutellum in repose; scape length equals first two and one-half flagellar segments; flagellar segment 1 slightly shorter than segments 2 plus 3, segment 3 longer than 2 and shorter than segment 4; segments 4-10 subequal in length, slightly longer than broad. Eye about three times as long as broad, inner margins converging slightly towards mandibles. Malar space, mandible, galea and labral process as in female. Clypeus as in female but punctures slightly coarser. Supraclypeal area and genal area as in female but genal area duller. Vertex and lace above antennal fossae as in female. Thoracic sculpturing as in female except as follows: propodeal dorsal enclosure usually more extensively rugulose, often with a single median longitudinal ruga; lateral propodeal surfaces duller, tessellate. Wing venation and tegulae as in female. Tergal sculpturing as in female except as follows: tergum 5 like terga 1-4; basal area punctures more distinct and separated mostly by one to two puncture widths; surfaces dulled by fine reticular tessellation. Pseudopygidial area not apparent. Sterna as in female but surfaces often dulled by coarse, dense, reticular shagreening. Sternum 6 flat, with apex with broad, shallow, V-shaped emargination.
Genital capsule and sterna 7 and 8 (Figs. 84-88) similar to those of braccata.
VESTITURE. — Generally white to pale ochraceous with vertex and thoracic dorsum darker ochraceous. Terga 1-5 with dense apical fasciae of white pubescence. Sterna 2-5 with weak subapical fimbriae of decumbent, moderately long hairs. Inner surfaces tarsi golden-yellow.
TYPE MATERIAL. — The holotype female of pecosana from Pecos, New Mexico, collected by T. D. A. Cockerell on August 31st (USNM No. 21,, 822). The holotype female (PHT) of townsendi from Dripping Springs, Organ Mountains, New Mexico, was collected August 10th by C. H. Townsend.
DISTRIBUTION. — A. pecosana is known from central and northern Mexico north to Colorado and west to Utah and Arizona (Fig. 9). It has been collected from July 28th through September 28th but chiefly during late August and September. In addition to the type material, 60 females and 30 males have been examined from the localities listed below.
ARIZONA: Chiricahua Mts.; Chambers; Flagstaff (and 7 miles S.); McNary Junction, Apache Co;. Payson; Rustlers Park, Chiricahua Mts.; Sanders (2 miles W.); Springerville (32 miles W.). COLORADO: Boulder; Coal Creek, Boulder Co.; Deer Creek Canyon; Glen Park; Marshal; Niwot, Boulder Co. NEW MEXICO: Dripping Springs, Organ Mts.; Hollywood; Pecos; Rowe; Santa Fe. UTAH: Kaibab Forest. Mexico. CHIHUAHUA: Santa Barbara. HIDALGO: Pachuca. JALISCO: Guadalajara (8 miles S.); Lagos de Moreno (13 miles S.W.); San Juan de los Lagos (8 miles S.W.). ZACATECAS: Fresnillo (9 miles S.E.).
Flower Records. Not enough records are available to state definite flower preferences for A. pecosana beyond that it is an oligolege of composites. It has been collected from flowers of the following plants.
Aster sp., Grindelia sp., Gutierrezia sarothrae, Helianthus sp., Heliopsis sp., Viguiera annua.
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References |
Andrena pecosana Cockerell, 1913, Annals of the Magazine of Natural History, ser. 8, vol. 12, p. 104.
Andrena (Pterandrena) pecosana: Lanham, 1949, University of California Publications in Entomology, vol. 8, p. 200.
Andrena townsendi Viereck and Cockerell, 1914, Proceedings of the United States National Museum, vol. 48, p. 49 (new synonymy); Cockerell, 1931, Amer. Museum Novitates, No. 458, p. 14.
Andrena colletoides Viereck and Cockerell, 1914, Proceedings of the United States National Museum, vol. 48, p. 27 (new synonymy); Lanham, 1941, Ann. Entomological Society Amer., vol. 34, p. 707.
Andrena (Pterandrena) townsendi: Lanham, 1949, University of California Publications in Entomology, vol. 8, p. 200.
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Updated: 2024-04-26 05:24:17 gmt
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