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Erysimum, Euphorbia crenulata, Heracleum lanatum, Horkelia parryi, Lomatium
dasycarpum, Lupinus, Malus, Microseris nutans, Nemophila aurita, Penstemon
grinnelU, P. palmeri, Phacelia distans, P. humilis, Poteyitilla glandidosa, Prunus
subcordata, Rhamnus califomicus, R. crocea, R. rubra, Ribes, Rosa califortiica, Rubus
leucodemiis, Salix, Scrophularia califomica, S. laciniata, Solidago canadensis, S.
multiradiata, Tamarix. Predator: Philanthus politus Say.
Prosopis verticalis Cresson, 1869. Boston Soc. Nat. Hist., Proc. 12: 271. ♂.
Prosapis fridentulus Cockerell, 1896. Psyche 7 (sup.): 27. ♂.
Prosopis tridens Cockerell, 1896. Psyche 7 (sup.): 28. ♂.
Prosopis subtristis Swenk and Cockerell, 1910. Ent. News 21: 70. ♀.
Prosopis melitina Lovell, 1911. Ent. News 22: 214. ♀.
Biology: Fye, 1965. Canad. Ent. 97: 867, table 1 (nest).
Genus HYLAEUS Subgenus CEPHALYLAEUS Michener
Hylaeus subg. Cephalylaeus Michener, 1942. N. Y. Ent. Soc, Jour. 50: 273.
Type-species: Prosopis basalis Smith. Orig. desig.
Revision: Snelling, 1968. Los Angeles Co. Mus., Contrib. Sci. 144: 1-3.
Hylaeus basalis (Smith)
Transcont. in U. S., south. Canada (montane areas, alpine in southern
distribution). Pollen: Unknown, but exhibits a decided preference for flowers of the
Rosaceae; visits a wide variety of flowers including Arctostaphylos patula, Calochortus
leichtlinii, Ceanothiis, Ckamaebatia foliolosa, Cymopterus terebinthus, Erigeron
coulteri, Eriogonum mariifolium, Horkelia fusca, Oxypolis occidentalis, Phyllodoce
breweri, Potentilla fruticosa, P. glandidosa, Rhamnus califomica, Rubus,
Sphenosciadium capitellatum, Veronica aniericana. Predator: Philanthus pulcher
Dalla Torre.
Prosopis basalis Smith, 1853. Cat. Hym. Brit. Mus., v. 1, p. 22. ♀, ♂.
Biology: Fye, 1965. Canad. Ent. 97: 864, table 1 (nest).
Hylaeus nunenmacheri Bridwell
Calif, (sea level to moderate elevations in the Coast Ranges and
Sierra Nevada). Pollen: Unknown, but exhibits a decided preference for the flowers of
the Rosaceae; visits a wide variety of flowers including Arctostaphylos patula,
Baccharis, Ceanothus cordulatus, C. cuyieatus, C. greggii, C. integerrimus, C. soredatus,
Ckamaebatia foliolosa, Cryptantha, Eriodictyon angustifolium, E. califomicum,
Phacelia distans, Prunus emarginata. Ranunculus occidentalis, Rhamnus califomicus,
R. crocea, Rhus diversiloba, Salix lasiolepis, Solidago califomica, Thysanocarpus
curvipes.
Hylaeus Nunemacheri Bridwell, 1919. Hawaii. Ent. Soc, Proc. 4: 157. ♀.
Genus HYLAEUS Subgenus METZIELLA Michener
Hylaeus subg. Metziella Michener, 1942. N. Y. Ent. Soc, Jour. 50: 273.
Type-species: Prosopis potens Metz. Monotypic and orig. desig. (=Prosopis sparsa
Cresson).
Revision: Snelling, 1968. Los Angeles Co. Mus., Contrib. Sci. 144: 3-4.
Hylaeus sparsus (Cresson)
Canada (Quebec), eastern U. S. (Mich, to N. Y. south to Ga.) west to Tex.
Pollen: Unknown, but visits flowers of Eidophus americanus, Osmorrhiza longistylis,
Thaspium aureum trifoliatum.
Prosopis sparsa Cresson, 1869. Boston Soc. Nat. Hist., Proc. 12: 271. ♀.
Prosopis thaspii Robertson, 1898. Acad. Sci. St. Louis, Trans. 8: 43. ♀.
Prosopis potens^ Metz, 1911. Amer. Ent. Soc, Trans. 37: 103. ♂.
Genus HYLAEUS Subgenus Unassigned
Hylaeus formosus Krombein
Fla. (Key Largo, Stock Is.); West Indies (Bahamas). Pollen: Unknown,
but visits flowers of Metopium toxiferum.
Hylaeus formosus Krombein, 1953. Amer. Mus. Novitates 1633: 19. ♀.
Hylaeus metopii Mitchell, 1960. N. C. Agr. Expt. Sta. Tech. Bui. 141: 80. ♀.
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Taxonomy: Krombein, 1967. U. S. Dept. Agr., Agr. Monog. 2, Sup. 2, p. 423.
Hylaeus graenicheri Mitchell
Fla. (Miami, Key Largo, Plantation Key, and Saddlebunch Keys). Pollen:
Unknown, but visits flowers of Metopium toxiferum, Flaveria linearis.
Hylaeus graenicheri Mitchell, 1951. Elisha Mitchell Sci. Soc, Jour. 67: 240. ♀.
Taxonomy: Mitchell, 1960. N. C. Agr. Expt. Sta. Tech. Bui. 141: 79. — Snelling, 1966. South.
Calif. Acad. Sci., Bui. 65: 174.
Hylaeus suffusus (Cockerell)
Nev. Possibly a Paraprosopis.
Prosapis suffusa Cockerell, 1896. Psyche 7 (sup.): 32. ♂.
Taxonomy: Snelling, 1966. South. Calif. Acad. Sci., Bui. 65: 174. —Snelling, 1970. Los Angeles
Co., Mus., Contrib. Sci. 180: 58.
Hylaeus tuertonis (Cockerell)
N. Mex. (Tuerto Mts. near Santa Fe), Colo. (Florissant). Possibly a
Paraprosopis and may be a synonym of H. wootoni (Cockerell).
Prosopi's tuertonis Cockerell, 1906. Amer. Mus. Nat. Hist., Bui. 22: 423. ♀.
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