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Andrena apacheorum Cockerell, 1897
Life   Insecta   Hymenoptera   Apoidea   Andrenidae   Andrena
Subgenus: Cnemidandrena

Andrena apacheorum, face
Smithsonian Institution, Entomology Department · 1
Andrena apacheorum, face

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Andrena apacheorum, side
Smithsonian Institution, Entomology Department · 1
Andrena apacheorum, side
Andrena apacheorum, top
Smithsonian Institution, Entomology Department · 1
Andrena apacheorum, top

Andrena apacheorum, wing
Smithsonian Institution, Entomology Department · 1
Andrena apacheorum, wing
Andrena apacheorum, Apache Andrena
© Copyright John Ascher, 2006-2014 · 1
Andrena apacheorum, Apache Andrena

Andrena apacheorum, Apache Andrena
© Copyright John Ascher, 2006-2014 · 1
Andrena apacheorum, Apache Andrena
Reprinted by permission of the Regents of the University of California from: Donovan, B. J. 1977. A revision of North American bees of the subgenus Cnemidandrena (Hymenoptera: Andrenidae). University of California Publications in Entomology: 1-107.

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Andrena apacheorum is quite similar morphologically to both A. latinensis and A. rodilla, but the clypeus in females is a little more protuberant and smoothly rounded from side to side. The vestiture is white except for metasomal segments 5 and 6 with brown vestiture; the apical fasciae are narrow and complete. This species is without features that may be regarded as specialized, and thus would seem to be the most generalized of Cnemidandrena.

FEMALE. MEASUREMENTS AND RATIOS. N = 20; length, 7.5-9.7 mm; width, 2.6-3.2 mm; wing length, M = 2.97 0.148 mm; FL/FW , M = 1.02 0.096; FOVL/FOVW, M = 3.08 0.190.

INTEGUMENTAL COLOR. Black except as follows: antenna medium brown below beyond first flagellar segment; mandible with apical half red; tibial spurs nearly white; tarsal claws with basal half yellow, apical half red; tegula shiny dark brown; wing veins medium brown; pterostigma yellow-brown; wing membranes moderately darkened apically, remainder hyaline; metasomal terga and sterna narrowly hyaline apically; pygidial plate red medially, sides nearly black.

STRUCTURE. Scape very slightly longer than flagellar segments 1 to 3; flagellar segment 1 longer than flagellar segments 2 plus 3, equal to flagellar segments 3 plus 4. Eye 3.6 times longer than wide, with inner margin diverging above except for extreme upper margin curving inwards. Malar space 8 times wider than long. Mandible in repose extends for one-third its length beyond middle of labrum; notch of mandible tooth equidistant between middle of labrum and mandible apex. Galea finely tessellate, lateral surface slightly narrower than dorsal surface. Maxillary palpus reaching very slightly beyond apex of galea; segmental ratio 0.8:1.0:0.9:0.8:0.7:0.7. Labial palpi basal segment moderately flattened laterally, moderately curved, apical segment attached subapically, segmental ratio 1.2:0.6:0.5:0.6. Labral process nearly flat, twice as wide as long, depth of median emargination about one-seventh length of labral process. Clypeus moderately protuberant, extending for one-third its length below level of eyes, upper peripheral half strongly shagreened with shagreening obscuring medium-sized punctures, median half smooth, shiny, with large punctures separated by 1 diameter except more widely separated medially. Supraclypeal area coarsely roughened with irregular, contiguous punctures. Genal area less than twice as wide as eye, whole area with medium-sized punctures separated by 3 diameters; upper half with narrow area near eye smooth, shiny, remainder with nearly reticular shagreening, dull. Vertex above lateral ocellus slightly wider than 1 ocellar diameter, moderately tessellate with deep punctures separated by one-half diameter or less. Supra-antennal area with longitudinal rugulae. Facial fovea widest above, narrowing slightly below, upper limits very indistinct but reaching above to a line through middle of lateral ocellus, reaching below to just below a line below antennal fossa.

Pronotum with humeral angle and ridge well developed except humeral ridge weakly depressed where crossed by pronotal suture; whole area shagreened. Scutum moderately tessellate, dull, with large, shallow punctures separated by 2 to 3 diameters with punctures moderately tessellate internally. Scutellum moderately tessellate in posterior half, but less so and nearly shiny in anterior half. Metanotum moderately tessellate in middle third, roughened by irregular punctures in lateral third. Propodeal enclosure with moderate tessellation except for anterior fringe of irregular, longitudinal rugulae. Dorsoposterior surface of propodeum with coarse tessellation and large, obscured punctures separated by 2 diameters. Mesepisternum moderately tessellate throughout with large punctures in dorsal half separated by 2 diameters, punctures smaller, more widely separated below. Metepisternum and lateral corbicular area of propodeum with reticular shagreening, corbicular area with a few medium-sized punctures in anterior quarter. Mesobasitarsus widest medially, 2.6 times wider than long, equal in width to metabasitarsus. Metabasitarsus widest basally, more than 3 times longer than wide, two-thirds as wide as metatibia. Metatibia widest apically, 3 times longer than wide. Pterostigma slightly less than 4 times longer than wide; vein 1st m-cu meets second submarginal cell one-fourth of distance from apical end of cell.

Metasomal terga 1 to 5 moderately tessellate, tessellation less prominent on apical areas; discs of terga 1 to 4 with small, indistinct punctures separated by 4 to 5 diameters, punctures much closer on apical areas of discs; tergum 5 with large, irregularly spaced punctures on disc, apical area with small, crowded punctures posteriorly. Pygidial plate somewhat reflexed, rounded apically, with broad, median area raised and sides upturned, small punctures separated by half diameter on raised median area except for small, impunctate, posterior area. Sterna 1 to 6 weakly shagreened; sternum 1 with very small, shallow, V-shaped, median emargination, with medium-sized punctures separated by 3 diameters. Sterna 2 to 6 with small punctures separated by 3 diameters except for narrow, transverse, basal, impunctate areas on sterna 3 to 5.

VESTITURE. White except as follows: vestiture of basitarsi brown; metafemur with apical fringe black or nearly black; scopa with dorsal, basal hairs black or nearly black; metasomal terga 5 to 6 with pubescence black. Clypeus medially with hairs less dense than laterally. Propodeal corbicula with sparse hairs in anterodorsal fourth. Trochanteral floccus imperfect.

Metasomal terga 1 to 4 with apical fasciae obscuring about one-third of terga; tergum 1 with sparse, long, erect hairs throughout, except hairs reclining apically forming ill-defined fasciae; terga 2 to 4 apically with short, appressed hairs forming compact fasciae; tergum 2 with shorter, erect hairs on disc; terga 3 to 4 with short, sparse, erect hairs on disc. Tergum 5 with long, reclining hairs not wholly obscuring surface. Sterna 1 to 2 with long, erect hairs medially; sterna 2 to 5 with fimbriae of long, nearly erect hairs, hairs longest laterally, remainder of sternal area with short, sparse, erect hairs except for naked, basal, transverse areas. Sterna 2 to 5 with apical fringe hairs short.

MALE. MEASUREMENTS AND RATIOS. N = 20; length, 6.5-9.3 mm; width, 1.8-2.5 mm; wing length, M = 2.50 0.249 mm; FL/FW, M = 0.99 0.075. FS1/FS2, M = 1.39 0.031.

INTEGUMENTAL COLOR. As in female except metasomal terga and sterna more widely hyaline apically.

STRUCTURE. About as in female except as follows: scape equal to flagellar segments 1 plus 2 plus one-third of flagellar segment 3; flagellar segment 1 almost 1.5 times longer than flagellar segment 2; flagellar segment 2 much shorter than flagellar segment 3. Eye length slightly less than 3.5 times width. Mandible in repose extends for one-fourth its length beyond middle of labrum. Maxillary palpus with half of apical segment projecting beyond apex of galea, segmental ratio 0.6:0.9:0.7:0.8:0.7:0.9. Labial palpal segmental ratio 1.1:0.5:0.3:0.5. Labral process strongly reflexed, twice as wide as long, median emargination deep, one-fifth length of reflexed area. Clypeus weakly protuberant, extending below level of eyes for two-fifths its length, whole surface with large, contiguous punctures except punctures separated medially by 1 diameter. Genal area opposite middle of eye produced to a blunt projection, genal area slightly less than twice as wide as eye. Parocular areas with rugulae converging dorsally from near eye margin toward midline, with medium-sized punctures separated by 1 diameter opposite antennal fossa, punctures obscured above level of antennal fossa.

Pronotum with humeral angle and ridge very well developed except humeral ridge depressed where crossed by pronotal suture; whole area with reticular shagreening except area above between humeral ridge and pronotal suture vertically rugulate, below humeral angle smooth, shiny. Lateral areas of propodeum moderately tessellate.

Metasomal terga and sterna with punctures smaller and fewer on tergum 5. Sternum 7 (fig. 13) narrowing basally, broadly truncate apically with lateral angles of truncate area with sparse hairs. Sternum 8 (fig. 14) with apex and neck region a little longer than basal region, apex not markedly expanded, neck with abundant, long hairs. Gonoforceps (figs. 10 to 12) in dorsal view strongly ridged, in lateral view pointed apically. Penis valves in dorsal and ventral view widest medially, apex lobe-like; in lateral view strongly bent downward, projecting well below gonoforceps.

VESTITURE. White throughout. Clypeus with abundant, long hairs.

Metasomal terga 2 to 4 as in female except hairs of fasciae less appressed, slightly longer; vestiture of tergum 5 as for tergum 4. Sterna 1 to 5 with abundant, long hairs throughout; sternum 6 with short hairs.

VARIATION. The median area of the clypeus in females may be almost impunctate or punctures may be scattered throughout. The genal angle in males varies in degree of development. In about 10 percent of the males the posterior edge of the gena above the angle seems to be slightly carinate.

Scientific source:

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FamilyScientific name @ source (records)
Asteraceae  Cirsium sp @ BBSL (1)

Cirsium @ UCRC_ENT (1)

Ericameria nauseosa @ BBSL (1)

Erigeron speciosus @ BBSL (2)

Erigeron @ I_JSA (1); UCRC_ENT (2)

Senecio @ UCRC_ENT (1)

Solidago velutina @ UCRC_ENT (1)
Geraniaceae  Geranium @ UCRC_ENT (1)
Lamiaceae  Agastache sp @ BBSL (1)
Scrophulariaceae  Mimulus guttatus @ BBSL (1)

Verbascum @ UCRC_ENT (1)
_  Asteraceae @ I_JSA (1)

Withheld @ BBSL (2)

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Updated: 2024-04-19 22:41:52 gmt
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