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

Andrena mentzeliae, Barcode of Life Data Systems
Barcode of Life Data Systems · 1
Andrena mentzeliae, Barcode of Life Data Systems

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Andrena mentzeliae, face
Smithsonian Institution, Entomology Department · 1
Andrena mentzeliae, face
Andrena mentzeliae, side
Smithsonian Institution, Entomology Department · 1
Andrena mentzeliae, side

Andrena mentzeliae, top
Smithsonian Institution, Entomology Department · 1
Andrena mentzeliae, top
Andrena mentzeliae, wing
Smithsonian Institution, Entomology Department · 1
Andrena mentzeliae, wing
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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Females are oligolectic on flowers of the genus Mentzelia within the family Loasaceae, and are thus separated ecologically from the remainder of North American Cnemidandrena for which pollen sources are known. Females are morphologically separated from other Cnemidandrena by the large, protuberant, naked, shiny clypeus, and the males by the penis valves very widely expanded basally. The wide ecological and morphological separation of this species suggests that it separated from the rest of Cnemidandrena at an early stage before the remaining species differentiated.

FEMALE. MEASUREMENTS AND RATIOS. N = 15;length, 10.3-11.4 mm; width, 3.1-3.9 mm; wing length, M = 3.54 0.145 mm; FL/FW, M = 1.05 0.108; FOVL/FOVW, M = 3.01 0.073.

INTEGUMENTAL COLOR. Black except as follows: antenna beyond second flagellar segment light brown beneath; mandible with apical half red; tibial spurs and tarsi except basitarsi light brown; basal half of tarsal claws light yellow-brown, apical half red; tegula, submarginal vein and stigma dark brown, remaining veins light yellow-brown; wing membrane hyaline except for moderate, apical cloud; metasomal terga and sterna hyaline apically.

STRUCTURE. Scape slightly longer than flagellar segments 1 to 3; flagellar segment 1 equal in length to flagellar segments 2 plus 3; flagellar segment 2 equal to flagellar segment 3. Eye more than 4 times as long as wide, inner margin subparallel except upper end inwardly curved. Malar space 8 times wider than long. Mandible in repose extends for one-fifth its length beyond middle of labrum; notch of mandible tooth one-third of distance between middle of labrum and mandible apex, ventrobasal angle weakly developed. Galea moderately tessellate, lateral surface narrower than dorsal surface. Maxillary palpus with apical segment projecting beyond apex of galea, segmental ratio 1.0:1.5:1.2:1.2:1.1:1.0. Labial palpus with basal segment moderately compressed, weakly curved laterally, apical segment moderately compressed, weakly curved laterally, apical segment attached subapically, segmental ratio 1.9 :1.0:0.8:0.9. Labral process moderately reflexed, wide basally, 3 times wider than long; depth of median emargination equal to one-third length of labral process. Clypeus projecting below eyes for almost one-half its length, moderately protuberant; large punctures dorsolaterally separated by 1 diameter, more widely spaced towards median third, median third impunctate, whole surface smooth, polished, except for very narrow dorsolateral periphery shagreened. Supraclypeal area with shallow, crowded punctures, shiny. Genal area twice as wide as eye with small punctures separated by 2 to 3 diameters; third next to eye smooth, shiny, remainder heavily shagreened. Vertex above lateral ocellus equal to 1 ocellar diameter, densely tessellate with deep punctures less than one-half diameter apart. Supra-antennal area with strong, longitudinal rugulae obscuring weak punctures. Facial fovea rounded above and below, wider above, narrowing below, reaching above to a line halving lateral ocellus, reaching below to a line just below antennal fossa.

Pronotum with humeral angle and ridge moderately developed but humeral ridge depressed where crossed by pronotal suture; surface dulled throughout by reticular shagreening. Scutum, posterior half of scutellum, metanotum, dorsoposterior surface of propodeum, with coarse, dense tessellation obscuring irregular punctures, dull. Anterior half of scutellum with moderate tessellation, surface nearly shiny. Propodeal enclosure with coarse tessellation, with a shallow, median, longitudinal depression and small rugulate area anteriorly. Mesepisternum moderately tessellate with obscure punctures. Metepisternum, lateral corbicular area of propodeum with weak tessellation; corbicular area of propodeum with a few punctures in anterior fourth. Mesobasitarsus not markedly expanded medially, somewhat less than 3 times longer than wide, equal in width to metabasitarsus. Metabasitarsus widest basally, 4 times longer than wide. Metatibia 3 times longer than wide, more than one-fourth as wide as metabasitarsus. Wing with pterostigma 5 times longer than wide; vein 1st m-cu meets second submarginal cell well beyond middle.

Metasomal terga 1 to 4 strongly tessellate except depressed margins less so, discs with obscure punctures separated by 4 to 5 diameters but punctures closer on posterior margin of discs. Tergum 5 similar but punctures more distinct. Pygidial plate rounded apically, sides slightly raised, posterior half smooth, dull, basal half with small, close punctures. Sternum 1 with apical, median, V-shaped emargination, median area with prominent punctures separated by 3 diameters; sternum 2 with broad, shallow, median emargination. Sterna 2 to 6 with punctures slightly less prominent, separated by 3 diameters; sterna 1 to 6 with weak, reticular shagreening.

VESTITURE. Yellow-white except dorsal pubescence of thorax brown-yellow. Clypeus naked except for periphery with few hairs. Propodeal corbicula with sparse hairs in anterodorsal fourth.

Metasomal terga 1 to 4 with apical fasciae of appressed hairs obscuring one-third terga. Tergum 1 with long, erect hairs on disc throughout; tergum 2 with shorter, erect hairs on median third of disc; lateral thirds of disc of tergum 2 and discs of terga 3 and 4 with short, erect hairs. Tergum 5 with short hairs inclined to posterior, becoming longer and more dense posteriorly. Sterna 1 to 6 with short, erect hairs throughout except for long, erect hairs of subapical fimbriae and apical fringes; subapical fimbriae well developed laterally, poorly developed medially, apical fringes moderately dense.

MALE. MEASUREMENTS AND RATIOS. -N = 12; length, 8.6-10.4 mm; width, 2.4-3.4 mm; wing length, M = 5.92 0.197 mm; FL/FW, M = 1.01 0.014; FS1/FS2, M = 1.61 0.142.

INTEGUMENTAL COLOR. Black except as follows: antenna beyond first flagellar segment red-brown beneath; mandible with apical third deep red; tegula and wing as in female except wing membrane slightly less clouded apically; legs as in female; metasomal terga and sterna very widely hyaline apically.

STRUCTURE. Scape equal to flagellar segments 1 plus 2 plus half of flagellar segment 3; flagellar segment 1 more than one and one-half times longer than flagellar segment 2; flagellar segment 2 shorter than flagellar segment 3. Eye more than 3 times longer than wide, with inner margin very slightly diverging above except upper end inwardly curved. Malar space, mandible and galea as in female except mandible without ventrobasal angle and lamella. Maxillary palpus with apical segment and half of subapical segment projecting beyond apex of galea; segmental ratio 0.7:1.0:0.9:1.0:0.9:0.9. Labial palpus with basal segment moderately compressed, strongly curved laterally, apical, subapical segments attached subapically, segmental ratio 1.3:0.6:0.7:0.8. Labral process strongly reflexed, twice as wide as long or more, apical emargination broad, depth one-fourth length of labral process or more. Clypeus moderately protuberant, evenly rounded from side to side, extending below eyes for two-fifths its length, with large punctures separated by one-half diameter except for median, longitudinal, impunctate strip, narrow above, broadening below, whole surface shiny. Supraclypeal area with similar punctation and light shagreening. Genal area less than 1.5 times as wide as eye, weakly produced to an angle opposite mid-point of eye; posteriorly with medium-sized punctures separated by 2 diameters, punctures decreasing in size anteriorly; posterior half moderately shagreened, anterior half shiny. Vertex, supra-antennal area as in female. Parocular areas with moderate, longitudinal rugulae and small, close punctures.

Pronotum with humeral angle and ridge very well developed, with pronotal suture prominent, crossing humeral ridge for a short distance above humeral ridge; with medium-sized punctures separated by 2 diameters, area below humeral ridge to pronotal suture with weak, dorsoventral rugulae, remainder shagreened except narrow angle between humeral ridge and pronotal lobe shiny. Remainder of thorax as in female except scutum with punctures more prominent, separated by 1 to 2 diameters, tessellation lighter dorsally, scutellum more shiny in anterior half; propodeum with lateral face with small, widely spaced punctures in upper half.

Metasomal terga 1 to 5 with disc with small punctures, on apex separated by 2 diameters, on remainder separated by 4 or more diameters, with weak to moderate tessellation. Sterna 1 to 6 as in female. Sternum 7 (fig. 43) with basal apodemes of equal width throughout; apex broad with a moderately deep, median emargination, wide area on each side of emargination with long hairs. Sternum 8 (fig. 44) with apex and neck region much longer than basal region, apex of basal region with a small, median emargination, neck region with abundant, long hairs. Gonoforceps (figs. 40 to 42) in dorsal view strongly ridged; inner apical margin shallowly emarginate. Penis valves in dorsal and ventral view very broadly expanded basally, narrowing strongly to slightly bulbous apex; in lateral view penis valves strongly downcurved.

VESTITURE. Color as in female. Clypeus nearly obscured by long hairs except hairs less dense along narrow median line. Scutum, scutellum with long, erect, moderately dense hairs.

Metasomal terga 1 to 5 with apical fasciae present on less than half tergal area; fascia of tergum 1 of long, nearly erect hairs, not wholly obscuring surface beneath, fasciae of terga 2 to 5 of shorter, dense, recumbent hairs, completely obscuring tergal surfaces beneath; tergum 1 with remainder of disc with long, erect hairs, tergum 2 with shorter, erect hairs medially, short, erect, sparse hairs laterally, terga 3 to 5 with short, erect, sparse hairs. Sterna 1 to 5 with apical fringes of moderately long, moderately dense hairs except sternum 1 with hairs shorter, remaining sternal area with long, sparse, erect hairs, hairs shortest anteriorly.

VARIATION. In both sexes variation is shown in the degree of expression of the median longitudinal depression in the propodeal enclosure.

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Loasaceae  Mentzelia nuda @ BBSL (1)

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Updated: 2024-04-17 23:09:21 gmt
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