abstract
| - Megachile (Argyropile) Mitchell 1937b: 46-47. Megachiloides (Argyropile) Mitchell 1980: 40. The subgenus comprises eight north American species, two of which reach the neotropics in Mexico. Mitchell (1943a: 16) provided a key to the identification of the females of seven species.
* 1. Megachile (Argyropile) flavihirsuta Mitchell Megachile flavihirsuta Mitchell 1930: 225-226. Male. Type locality: Guadalajara, Mexico, 14 Sept (McClendon). Type repository: ANSP 4126. Megachile (Argyropile) flavihirsuta : Mitchell 1937b: 46. DISTRIBUTION. MEXICO: GU; HI; JA; MI; MO; NA; PU; SI; VC; ZA.
* 2. Megachile (Argyropile) parallela Mitchell Megachile parallela Smith 1853: 191. Male. Type locality: Georgia [U.S.A.]. Type repository: NHML 17a2413. Megachile (Argyropile) parallela : Mitchell 1934: 302. Megachile facunda Cresson 1872: 266. Male. Type locality: Texas (Belfrage). Type repository: ANSP 2426. Synonymy of Cockerell 1913: 536. Megachile 6-dentata Robertson 1895: 125. Male. Type locality: Illinois. Synonymy of Cockerell 1913: 536. Megachile verbesinae Cockerell 1908b: 264-265. Female. Type locality: Rinconada, Upper Rio Grande, New Mexico, 26 September at Verbesina exauriculata (Cockerell). Synonymy of Mitchell 1944: 132. Megachile (Argyropile) parallela var. rita : Mitchell 1937b: 53. Female. Type locality: Mt. Santiago, California, 19 Sept 1926 on Ericameria parishii (P. H. Timberlake). Type repository: USNM 44251. Synonymy of Hurd 1979: 2066. Megachile (Argyropile) parallela var. reta : Mitchell 1943a: 16 (misspelling). Megachile (Argyropile) parallela parallela : Mitchell 1962: 159- 161 (D, F, L, R-FM). ADDITIONAL REFERENCES. Cockerell 1905: 337 (R-M); 1915: 268 (D, F); W.P. Cockerell 1917: 191 (D); Robertson 1926: 378; 1929 (F as M. sexdentata); Mitchell 1928: 333 (M); 1937b: 48-53 (D, F, R-FM); 1941: 167 (D, F, M); 1943a: 12 (D); Graenicher 1930: 162 (D, F); Fischer 1951: 49-50 (N); Hurd 1979: 2066 (D, F, N); Parker 1981: 62, 65 (F). DISTRIBUTION. CANADA: BC. MEXICO: CH, CO; DU; HI; JA; MO; NA; OA; PU; SO; VC; ZA. U.S.A.: ND; IN; TX; AR;CA (to 4,000 ft); GA; IO; KA; MO; NC; OK. FLOWERS. Polylectic; visits 48 genera, including many Compositae. Agoseris, Asclepias, Aster, Baccharis, Boltonia, Brassica geniculata, Calycadenia multiglandulosa, Ceanothus, Centaurea melitensis, C. solstitialis, Cephalanthus, Chrysanthemum, Chrysothamnus, Cirsium, Clarkia williamsonii, Coreopsis grandiflora, C. lanceolata, C. tinctoria, Corethrogyne, Encelia farinosa, Ericameria parishii, Erigeron pygmaeus, Eriophyllum confertiflorum, Gaillardia pulchella, Gilia, Gossypium, Grindelia camporum, Gutierrezia californica, G. sarothrae, Haplopappus squarrosus, H. vernonioides, Helenium bigelovii, Helianthus annuus, H. atrorubens, H. gracilentus, H. nuttallii, H. petiolaris, Heliopsis, Hemizonia lobbii, H. wrightii, Heterotheca grandiflora, H. subaxillaris, Hypericum, Lepachys, Lotus scoparius, Malacothrix tenuifolia, Medicago, Melanthera parvifolia, Melilotus alba, Monarda punctata, Palafoxia linearis, Petalostemon, Phaseolus, Ratibida columnaris, Rudbeckia, Senecio douglasii, Silphium, Stephanomeria exigua, Verbena, Verbesina encelioides, Viquiera, Xanthocephalum, Zexmenia. Also reported as oligolectic on Asterae and Heliantheae. LIFE HISTORY. Adults fly from June to September. NESTING. Excavates nest 5 cm deep in ground, but also accepts trapnests. Uses leaf-cuttings and entire leaves and leaflets of Spiraea vanhoutteii and Trifolium repens. MORPHOLOGY. Intersex.
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