1932 Hymenoptera in America North of Mexico 



Taxonomy: Timberlake, 1968. Calif. Univ. Pubs. Ent. 49: 40 (tax. status, key). 

 wyomingensis wyomingensis Cockerell. Wyo. (Teton County). Predator: Philanthus pulcher 

 Dalla Torre. 

 Perdita wyoyriingensis Cockerell, 1922. Amer. Mus. Novitates 33: 13. 9 . 



Taxonomy: Timberlake, 1968. Calif. Univ. Pubs. Ent. 49: 40 (type, tax. status, key). 



Genus PERDITA Subgenus XEROMACROTERA Timberlake 



Perdita subg. Xeromacrotera Timberlake, 1954. Calif. Univ. Pubs. Ent. 9: 412. 

 Type-species: Macrotera cephalotes Cresson. Orig. desig. 



Taxonomy: Timberlake, 1954. Calif. Univ. Pubs. Ent. 9: 347 (key). 

 cephalotes (Cresson). Nev., Calif. (Kern and San Bernardino Counties), Ariz. (Coconino 



County). Pollen: Unknown, but visits flowers of Clirysotliavmus, Gutierrezia lucida. 

 Macrotera cephalotes Cresson, 1878. Amer. Ent. Soc, Trans. 7: 71. S . 



Taxonomy: Timberlake, 1954. Calif. Univ. Pubs. Ent. 9: 413, figs. 109, 110, 170 (male 

 genitalia, geogr. and floral records). —Timberlake, 1968. Calif. Univ. Pubs. Ent. 49: 22 

 (geogr. and floral record). —Timberlake, 1971. Calif. Univ. Pubs. Ent. 66: 7 (geogr. and 

 floral record). 



Genus PERDITA Subgenus XEROPHASMA Cockerell 



Xerophasma Cockerell, 1923. Amer. Mus. Novitates 66: 1. 



Type-species: Perdita beqiiaertiana Cockerell. Monotypic and orig. desig. 

 (=Xerophasvia bequaerti Cockerell). 



These species are apparently crepuscular and obtain pollen only from the flowers of 

 Oenothera. 



Taxonomy: Timberlake, 1954. Calif. Univ. Pubs. Ent. 9: 346, 348-349 (redescription, key to 

 included spp.). 

 bequaertiana Cockerell. Tex. (El Paso and Howard Counties), N. Mex. (Albuquerque). Pollen: 

 Collects pollen from the flowers oi Oenothera. 

 Xerophasma bequaerti Cockerell, 1923. Amer. Mus. Novitates 66: 2. 9. Preocc. 

 Perdita bequaertiana Cockerell, 1951. In Michener, In Muesebeck, Krombein and Townes, 

 U. S. Dept. Agr., Agr. Monog. 2: 1089. N. name. 



Taxonomy: Timberlake, 1953. Kans. Univ. Sci. Bui. 35: 962-963. 6. —Timberlake, 1954. Calif. 



Univ. Pubs. Ent. 9: 349, figs. 1, 2, 115 (key). —Timberlake, 1958. Calif. Univ. Pubs. Ent. 14: 



375 (geogr. record). 

 pallida Timberlake. Calif. (Colorado Desert), Ariz. (Yuma). Ecology: Attracted to artificial 

 lights near dusk through early evening. This species was readily observed in flight at 

 Borrego and Hopkins Well on the Colorado Desert by shining automobile headlights on 

 the patches of Oenothera being visited by this species. Commencing about nightfall 

 many males and some females were attracted to the lights of gasoline lanterns. Activity 

 at the flowers continued well into the darkness of early evening. These observations 

 were made in sand dune areas and suggest the possibility that this species may be 

 arenophilous in its choice of nesting sites. Pollen: Collects pollen from the flowers of 

 Oenothera deltoides, 0. trichocalyx, but visits these and other flowers for nectar 

 including Trichoste7)ia. 



Perdita pallida Timberlake, 1954. Calif. Univ. Pubs. Ent. 9: 349. 9,6. 



NoMEN Nudum in Perdita 

 Perdita excisa Timberlake, 1928. Amer. Mus. Novitates 321: 10. 



Family HALICTIDAE 



This is among the largest and most widely distributed families of bees. All three of its sub- 

 famihes occur in the Nearctic Region, but only the Dufoureinae and the Halictinae are well 

 represented by numerous species. 



