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Reprinted with permission of the American Entomological Society from:
LaBerge, W. E. 1980. A revision of the bees of the genus Andrena of the Western Hemisphere. Part X. Subgenus Andrena. Transactions of the American Entomological Society 106: 395-526.
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The female of Andrena lanhami was mistakenly associated with the male of ribifloris by Viereck and Cockerell (1914). The holotype male of ribifloris is clearly a synonym of A. thaspii Graenicher, but the female allotype and paratype of ribifloris described by Viereck and Cockerell are clearly representatives of an unnamed species. I have named this species in honor of Urless N. Lanham who contributed a great deal to our knowledge of North American species and subgenera of Andrena. Andrena lanhami is related and very similar to A. hemileuca but is smaller in size, as dark as the darkest hemileuca and lacks the median indentation or emargination of the vertex. The male of lanhami is especially difficult to separate from that of hemileuca and can be separated with confidence only from those males of hemileuca with the median emargination of the vertex present. The male of lanhami usually has the facial rugulae parallel and, thus, resembles the male of milwaukeensis from which it can be separated by the more coarsely punctate clypeus and the longer basoinferior mandibular angle. As far as in known, A. hemileuca and A. lanhami are allopatric, lanhami being known from Montana, Wyoming, Utah and Colorado and hemileuca from California, Oregon, Washington and British Columbia. On the other hand, A. milwaukeensis is sympatric with lanhami throughout most of its range and seemingly allopatric with hemileuca.
FEMALE. MEASUREMENTS AND RATIOS. — N = 20; length, 9-10 mm; width, 2.5-3.0 mm; wing length, M = 3.93 ± 0.193 mm; FL/FW, M = 0.97 ± 0.053: FOVL/FOVW, M = 3.18 ± 0.034.
INTEGUMENTAL COLOR. — As in schuhi.
STRUCTURE. — Antennae as in schuhi. Eyes each about three and one-half times as long as broad, inner margins parallel. Mandible as in vicinoides but basal inferior tooth weak (holotype) or absent (usually absent). Malar space long, as in rufosignata. Galea as in shuhi. Maxillary palpus as in frigida but segmental ratio about as 0.8:1.0:0.8:0.7:0.7:0.7. Labial palpus as in frigida but ratio about as 1.0:0.6:0.6:0.6. Labral process and labrum as in schuhi. Clypeus as in schuhi but median impunctate line distinct, broad, usually slightly elevated above surface, punctures usually smaller, surface usually dulled by shagreening in basal half (holotype) or more. Supraclypeal area as in schuhi. Face above antennal fossae with longitudinal rugulae parallel, rarely diverging towards ocelli (one specimen), usually not as coarse as in schuhi. Facial fovea as in schuhi. Vertex as in schuhi but not emarginate medially. Genal area as in schuhi. Thoracic form and sculpturing as in vicinoides but propodeal dorsal enclosure roughened across base and often in basal half (holotype). Metasomal terga, sterna and pygidial plate as in schuhi.
VESTITURE. — Head entirely dark brown except vertex with dark ochraceous hairs posteriorly. Thorax with dorsum ochraceous to fox-red, pleurae and sides of propodeum dark brown. Metasomal terga 1 and 2 ochraceous, terga 3-6 brown; sternal hairs dark brown. Legs with dark brown hairs except hind femora and trochanters often pale brown (holotype) to white and tibial scopal hairs along anterior margin paler than posteriorly. Form and distribution of hairs as in schuhi and vicinoides.
MALE. MEASUREMENTS AND RATIOS. — N = 5; length, about 9 mm; width, about 2 mm; wing length, M = 3.36 ± 0.507mm; FL/FW, M = 1.00 ± 0.020: FS1/FS2, M = 1.40 ± 0.074.
INTEGUMENTAL COLOR. — As in female with tergal and sternal apical areas more translucent and wing membranes only slightly infumate.
STRUCTURE. — Antennal scape about as long as first two flagellar segments; first flagellar segment distinctly longer than segment 2 which is shorter than 3 and slightly longer than broad. Eyes each about three times as long as broad, inner margins parallel. Mandibles, malar space and galea as in schuhi. Maxillary palpus as in female but segmental ratio about as 0.8:1.0:0.8:0.6:0.6:0.8. Labial palpus as in female. Labral process and labrum as in schuhi. Clypeus as in schuhi with weak median impunctate line. Supraclypeal area as in female. Face above antennal fossae with longitudinal rugulae parallel (allotype) to diverging towards ocelli (one specimen). Vertex as in female. Genal area as in vicinoides and schuhi. Thoracic form and sculpturing as in female but pronotal ridge sharp and surface posterior to ridge shiny. Metasomal terga, pseudopygidial area, sterna 2-6 as in schuhi. Terminalia as in figures 117-121.
VESTITURE. — Head ochraceous except along inner margins compound eyes, lower surfaces genae and vertex with long dark brown hairs. Thoracic vestiture ochraceous, slightly reddened dorsally. Metasomal terga 1 and 2 and usually base of 3 (not in allotype) with long ochraceous hairs; terga 3-7 and sterna with brown hairs. Leg hairs dark brown but inner surfaces tarsi pale.
TYPE MATERIAL. — The holotype female (UCNH), allotype male (UCNH), four female paratypes (UCNH, PHT, UCR, INHS) and two male paratypes (UCNH, INHS) were collected near Ward, Boulder Co., Colorado, June 2-9, 1933, By H.G. and H.E. Rodeck. Twenty-two additional paratypes from Colorado are as follows: Boulder: 7 FF, May 11, 1965 on Ribes sp., B. Vogel, Elbert: 1 F, May 26, on Ribes sp., Figgins and Cockerell. Estes Park: 1 9, June 7, 1956, R. and K. Dreisbach. Florissant: 1 F, June 11,1 F, June 14, 1 9, June 15, 1 F, June 16, 1907, on Ribes vallicola, S.A. Rohwer. Junction Routes 14 and 40 (10 mi. N.): 1 F, July 2, 1962, R. and K. Dreisbach. Loveland (10 mi. W.S.W.): 3 F, May 15, 1963, on Ribes sp., L.C. Lanham. Poudre Pass: 1 F, June 20, T.D.A. Cockerell. Ute Creek: 1 F, June 24, 1 F, June 27, L. Bruner. "COL": 2 FF (paratypes of Andrena ribifloris Viereck and Cockerell). Paratypes are located in the following collections: UCNH, INHS, USNM, MSU, SECK, NSM, PHT, UCB.
DISTRIBUTION. — Andrena lanhami occurs from Colorado north to Montana and west to Utah (Fig. 9). Since only five specimens are known in addition to the type material listed above, data are given in full. MONTANA: Rosebud Lake (East), Carbon Co.: 1 F, 2 MM, June 20, 1964, on Vaccinium sp., B. Vogel. UTAH: Uintah Co.: 1 F, G.E. Wallace. WYOMING: Big Horn: 1 F, June 7, 1952, P.B. Lawson.
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References | |
Andrena ribifloris; Viereck and Cockerell, 1914, Proc United States Nat. Mus., 48:40-41 (misdetermination, in part); Cockerell, 1932, Ent. News, 43:48-49 (misdetermination, in part).
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Updated: 2024-05-04 14:44:06 gmt
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