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Andrena tonkaworum Viereck, 1917
Andrena (Ptilandrena) tonkaworum Viereck, 1917

Life   Insecta   Hymenoptera   Apoidea   Andrenidae   Andrena
Subgenus: Callandrena_sensu_lato

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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 bee is related to verecunda but differs in the punctation as described below and in the broadly translucent apical margins of the terga in both sexes. In addition, the female of tonkaworum has weak but complete apical pale bands on terga 2-4, entirely pale scopal hairs, a short vertex, and terga 2-4 are duller. The male of tonkaworum is distinctive in that flagellar segments 2 and 3 are subequal and each shorter than segment 4, terga 2-5 have weak apical fasciae and sterna 2-5 have well-developed subapical fimbriae.

FEMALE. MEASUREMENTS AND RATIOS. — N = 20; length, 12-14 mm; ;width, 3-4 mm; wing length, M = 4.16 ą 0.158 mm; FL/FW, M = X1.04 ą 0.005; FOVL/FOVW, M = 2.33 ą 0.033.

INTEGUMENTAL COLOR. — Black except as follows: mandible in apical half dark rufescent; flagellar segments 4-10 dark red below; tegulae testaceous; wing membranes hyaline, slightly yellowish, veins yellow to dark red; terga 1-4 with apical one-fourth to one-third hyaline, yellow to rufescent; sterna 2-5 hyaline apically, yellow; distitarsi and often basitarsi dark rufescent; tibial spurs yellow.

STRUCTURE. — Antennae short, scape equal to flagellar segments 1-3 plus halt of 4; flagellar segment 1 equal to segments 2 plus 3 plus half of 4, segments 2 and 3 equal in length and distinctly shorter than 4, segments 4 and 5 quadrate. Eye about three and two-thirds as long as broad; inner margins parallel or almost so. Malar space linear. Mandible short, outer extends in repose beyond middle of labrum by one-fifth or less of its length; subgenal coronet and basoventral angle as in verecunda. Galea as in verecunda. Maxillary palpus short, barely exceeds galea when stretched forwards, segmental ratio about 1.0:1.2:0.7:0.7:0.6:0.8. Labial palpus as in verecunda, first segment with breadth to length about as 4:16, segments in ratio of about 1.6:1.0:0.5:0.9. Labral process as in verecunda. Clypeus as in verecunda but punctures slightly more crowded, shagreening weak but regular, moderately shiny. Supraclypeal area as in verecunda. Genal area in profile slightly broader than eye, with minute round punctures crowded near eye, sparser posteriorly, surface coarsely and reticularly shagreened, dull except narrow zone next to eye. Vertex short, above lateral ocellus equal to slightly more than one ocellar diameter, surface dulled by shallow punctures H and coarse tessellation. Face above antennal fossae punctate as in verecunda. Facial fovea extends down to about level of middle oĢ antennal fossa, round and extremely shallow below, broader and rounded above, separated from lateral ocellus by somewhat more than halt an ocellar diameter.

Pronotum normal. Thoracic sculpturing as in verecunda but punctures everywhere shallower and less distinct, slightly sparser, tessellation coarser. Wing with three submarginal cells; vein 1st m-cu received near middle of second cell; second submarginal cell long, along posterior margin equals about half of first cell, along anterior margin longer than vein r from pterostigma to cell; pterostigma long, about as broad as from inner margin of prestigma to, wing margin. Middle basitarsus slightly expanded medially, about as. broad as hind basitarsus, angulate at apex anteriorly but not produced. Claws and tibial spurs normal.

Metasomal terga opaque, dulled by fine regular tessellation except apically moderately shiny; terga 1-5 basally with minute; punctures separated mostly by 2 to 4 puncture widths, apical area with minute punctures slightly more crowded. Pygidial plate V-shaped, broad, with blunted apex. Sterna 2-5 as in verecunda but less shiny.

VESTITURE. — Generally bright ochraceous above to pale ochraceous below. Terga 2-4 with weak but distinct apical fasciae, that on tergum 2 often narrowly interrupted medially. Terga 5 and 6 with pale ochraceous to white hairs. Sternal hairs ochraceous, fimbriae distinct. Propodeal corbicula, trochanteral flocculus and scopa as in verecunda. Scopal hairs entirely ochraceous.

; Male. MEASUREMENTS AND RATIOS. — N = 8; length, 12-13 mm; width, 3-4 mm; wing length, M = 3.98 ą 0.099 mm; FL/FW, M = 1.10 ą 0.149; FS1/FS2, M = 2.56 ą 0.063.

INTEGUMENTAL COLOR. — Black except as follows: mandible dark rufescent apically; flagellar segments 4-11 red below; tegulae testaceous; wing membranes hyaline, slightly yellow, veins red to dark red; terga 1-5 broadly hyaline apically; sterna 2-5 narrowly hyaline topically; distitarsi rufescent.

ff structure: Antennae short, in repose extending back 10 middle of tegulae; scape equals flagellar segments 1-3 or slightly longer; flagellar segment 1 longer than 2 plus 3, segments 2 and 3 equal in length and shorter than segment 4, segments 4-10 slightly longer than broad. Eye about three times as long as broad or slightly longer; inner margins converging slightly towards mandibles. Malar space, mandibles and galea as in female. Maxillary palpus as in female but ratio about 1.2:1.0:0.9:0.8:0.9:0.8. Labial palpus as in female but first segment somewhat broader at apex (breadth is to length about as 7:17) and ratio about 1.4:1.0:0.5:0.7. Labrum, clypeus, supraclypeal area, genal area, vertex and face above antennal fossae as in female.

Thoracic and metasomal sculpturing as in female except as follows: lateral propodeal surfaces dull, tessellate; terga with basal area punctures slightly more distinct; sterna 2-5 shinier. Wing veins and pterostigma as in female. Claws and tibial spurs normal. Sternum 6 reflexed apically but weakly so except laterally. Genitalia and sterna 7 and 8 (Figs. 184-188) similar 10 those of crawfordi but note broader apex of sternum 8 and narrower apical area of sternum 7.

1 vestiture: Generally pale ochraceous to bright ochraceous, usually brighter on dorsum than laterally or below. Terga 2-5 with weak apical pale fasciae complete except occasionally on tergum 2 narrowly interrupted medially. Sterna 2-5 with distinct subapical fimbriae of pale, moderately short, highly barbed hairs. Diner surfaces tarsi pale yellow.

TYPE MATERIAL. — The holotype female of (PANS No. 4074) of tonkaworum is from Texas.

DISTRIBUTION. — A. tonkaworum is known to occur from Texas and New Mexico north to Colorado and Nebraska. It has been collected from April 6th through July 26th, but chiefly in late May and June. In addition to the holotype listed above, 44 females and 8 males have been examined from the localities listed below.

COLORADO: Regnier. KANSAS: Syracuse (10 miles E.); Wallace Co. NEBRASKA: Alliance. NEW MEXICO: Clovis; Maxwell. TEXAS: Alpine; Canadian; Edna; Eldorado; Ft. Sam Houston; Odessa; Salado Creek, Bexar Co.

FLORAL RECORDS. — A. tonkaworum has been collected only on flowers of Englemannia spp. and is, perhaps, an oligolege of that plant.

Scientific source:

Andrena (Ptilandrena) tonkaworum Viereck, 1917, Transactions of the American Entomological Society, vol. 43, p. 396.

Andrena (Pterandrena) tonkaworum: Lanham, 1949, University of California Publications in Entomology, vol. 8, p. 200.

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FamilyScientific name @ source (records)
Asteraceae  Engelmannia pinnatifida @ BBSL (1)

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Updated: 2023-11-29 08:49:06 gmt
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