2178 Hymenoptera in America North of Mexico 



missouriense, Robinia pseudacacia, Rubus, Rudbeckia, Salix discolor, S. nigra. Salvia, 

 Sambucus, Sanguinaria, Scilla campanulata, Senecio aureus, Smillacina, Solidago 

 canadensis, S. rigida, S. ruprestis. Spiraea vanhouttei, Taenidia, Taraxacum officinale, 

 T. taraxacum, Tussilago farfara, Vaccinium, Verbena, Viburnum molle, Viola 

 papilionacea, Waldsteinia, Zanthoxylum, Zizia aurea. 

 Ceratina calcarata Robertson, 1900. Acad. Sci. St. Louis, Trans. 10: 54. <J. 



Biology: Rau, 1926. Acad. Sci. St. Louis, Trans. 25: 184. — Rau, 1928. Ent. Soc. Amer., Ann. 



21: 380 (nest, parasite). — Krombein, 1960. Ent. News 71: 68 (nest, parasite). 

 dupla Say. Que. to Fla., west to Man., south to Tex., La. and Miss. Parasite: Aprostocetus 

 americanus Ashm., Axima zabriskiei Howard, Diomorus zabriskiei Cress., Grotea 

 anguina Cress., Habritys latrus Wallace, Hoplocryptus gracilis (Prov.), Merisus sp. 

 Pollen: Polylectic, visits a wide variety of flowers including Aesculus glabra sargentii, 

 Amelanchier canadensis, Ammannia, Amorpha, Anemonella, Antennaria 

 plantaginifolia, Anthemis cotula, Arctium, Arabis, Aruncus, Asclepias, Aster 

 paniculatus Barbarea vulgaris. Benzoin aestivale, Bidens mitis, B. pilosa, Blephilia, 

 Brassica, Brauneria, Cacalia, Camassia, Capsella bursa-pastoris, Cardamine, 

 Ceanothus, Cephalanthus occidentalis, Cerastrium, Chrysanthemum leucanthemum, 

 Chrysopsis, Circaea, Cirsium, Claytonia caroliniana, Collinsia, Convolvulus, Coreopsis, 

 Comus, Crataegus punctata, Cryptotaenia, Cypripedium, Daucus carota. Delphinium, 

 Dentaria diphylla, D. laciniata, Dianthera, Diospyros, Dirca, Ellisia, Emilia coccinae, 

 Erigenia, Erigeron annuus, E. canadensis, E. philadelphicus, E. quercifolius, 

 Eryngium, Erythronium, Eupatorium, Flaveria linearis, Fragaria virginiana, Galactia, 

 Geranium maculatum, Gerardia, Gillenia, Hedeoma, Helenium, Helianthus, Heliopsis, . 

 Heracleum, Houstonia, Hydrangea paniculata, Hydrophyllum, Hypoxis, Isopyrum, 

 Krigia, Lactuca, Leonurus, Lepidium, Liatris, Lithospermum, Lobelia, Lycopus, 

 Lythrum, Malus, Marrubium, Medicago lupulina, Melilotus alba, M. officinalis, 

 Monarda, Nelumbo, Nepeta, Oenothera, Opuntia, Oxalis, Pastinaca, Penstemon, 

 Petalostemon, Phacelia covillei, Phyrma, Poinciana, Polemonium, Polygonatum, 

 Polygonium, Potentilla recta, Prunus americana, P. serotina. Prunella, Psoralea, 

 Ptelea, Pulsatilla, Pycnanthemum, Ranunculus, Rhannus, Rhus, Rosa, Rubus, 

 Rudbeckia, Sabatia, Sagittaria, Salix discolor, S. sericea. Salvia lyrata, S. pratensis, 

 Sambucus, Scrophularia, Scutellaria, Senecio plattensis, Sida, Silphium, Sinapis, 

 Smilax, Solidago, Specularia, Spiraea, Stachys floridana, Stellaria, Stokesia laevis, 

 Taraxacum dens-leonis, T. officinale, Teucrium, Tradescantia, Trifolium, Triosteum, 

 Tussilago farfara, Vaccinium corymbosum. Verbena, Verbesina, Vemonia, Veronica, 

 Viburnum, Viola rafinesquii, Waldsteinict, Zizia aurea. Predator: Atomosia puella 

 (Wied.). 



Ceratina dupla Say, 1837. Boston Jour. Nat. Hist. 1: 397. 9 (<J misdet.). 



Halictus Ontariensis Provancher, 1882. Nat. Canad. 13: 203. 6. 



Ceratina dupla var. halophila Cockerell, 1911. Canad. Ent. 43: 390. 9. 



Ceratina dupla floridana Mitchell, 1962. N. C. Agr. Expt. Sta. Tech. Bui. 152: 505. cJ, 9. 



Taxonomy: Michener, 1953. Kans. Univ. Sci. Bui. 35: 1063, figs. 173-179 (larva). 



Biology: Angus, 1869. Amer. Nat. 2: 49. — Ashmead, 1894. Psyche 7: 25. — Comstock and 

 Comstock, 1895. Manual for Study of Insects, p. 669. —Packard, 1897. N. Y. Ent. Soc, 

 Jour. 5: 112. — Graenicher, 1905. Ent. News 16: 43. — Graenicher, 1905. Wis. Nat. Hist. 

 Soc, Bui. 3: 158. —Hicks, 1926. Colo. Univ., Studies 15: 250. 

 strenua Smith. N. Y. to Ga., west to Wis., Mo., Kans., Okla. and Tex. Parasite: Axima 



zabriskiei Howard, Grotea anguina Cress. Pollen: Polylectic, visits a wide variety of 

 flowers including Amorpha fruticosa, Arctium minus, Asclepias tuberosa. Aster, 

 Brauneria purpurea, Callirhoe digitata, Ceanothus ovatus, Cercis canadensis. 

 Chrysanthemum, Chrysopsis, Claytonia virginica. Coreopsis grandiflora, Crataegus, 

 Daucus carota, Erigeron philadelphicus. Euphorbia, Fragaria virginiana. Geranium 

 maculatum, Helenium, Helianthus, Heterotheca, Hydrangea arborescens, Kolkwitzia 

 amabilis, Leucanthemum, Marrubium vulgare, Melilotus albus, M. officinalis, 

 Oenothera, Oxalis, Phacelia, Potentilla pumila, P. canadensis, Prunus, Psoralea 

 floribunda, Ptelea trifoliata, Pyracantha, Rhus aromatica, R. canadensis, R. glabra. 



