Superfamily APOIDEA 1769 



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. 6. 



Prosapis fridentulus Cockerell, 1896. Psyche 7 (sup.): 27. 6. 



Prosopis tridens Cockerell, 1896. Psyche 7 (sup.): 28. 6. 



Prosopis subtristis Swenk and Cockerell, 1910. Ent. News 21: 70. 9. 



Prosopis melitina Lovell, 1911. Ent. News 22: 214. 9. 



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. 

 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. 9, S. 



Biology: Fye, 1965. Canad. Ent. 97: 864, table 1 (nest). 

 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. 9. 



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. 

 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. 9. 

 Prosopis thaspii Robertson, 1898. Acad. Sci. St. Louis, Trans. 8: 43. 9 . 

 Prosopis potens^ Metz, 1911. Amer. Ent. Soc, Trans. 37: 103. 6. 



Genus HYLAEUS Subgenus Unassigned 



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. 9. 

 Hylaeus metopii Mitchell, 1960. N. C. Agr. Expt. Sta. Tech. Bui. 141: 80. 9. 



