1756 Hymenoptera in America North of Mexico 



willistoni Robertson. N. S. to Utah, south to Tex. and Fla. Pollen: Unknown, but visits flowers 

 of Ceanotlius americanus, Melilofus alba, Monarda punctata occidentalis, Physalis 

 elliottii, P. virginiana, Psoralea tenuiflora, Pycnanthemurn flexuosum, Rhus glabra, 

 Toxicodendron. Predator: Pliilantlius albopilosus Cress. 

 Colletes Willistoni Robertson, 1891. Amer. Ent. Soc, Trans. 18: 60. 9. 



Taxonomy: Robertson, 1895. Amer. Ent. Soc, Trans. 22: 116. 6. 



Biology: Evans, 1975. Ent. Soc. Amer., Ann. 68: 891 (predator). 



Species Group Consors 



californicus Provancher. South, and Centr. Calif. Pollen: Possibly oligolege of Phacelia, 



visiting flowers of Baccharis, Cryptantha intermedia, Layia platyglossa, Nemophila 

 aurita, N. menziesii, Phacelia affinis, P. distans, P. tanacetifolia. 

 Colletes californica Provancher, 1895. Nat. Canad. 22: 189. 9,6. 

 chamaesarachae Cockerell. Ariz., N. Mex. Pollen: Unknown, but visits flowers of 

 Chamaesaracha coronopus. 

 Colletes chamaesarachae Cockerell, 1897. Ann. and Mag. Nat. Hist. (6) 19: 49. 9. 

 consors consors Cresson. Mont., Idaho, Wyo., Colo., Calif. (Mono Basin). Pollen: Possibly 



oHgolege of Hydrophyllaceae, visiting flowers of Hydrophyllum fendleri, Penste}uon 

 vire7is, Phacelia leucophylla, Taraxacum. 

 Colletes consors Cresson, 1868. Boston Soc. Nat. Hist., Proc. 12: 168. 6. 

 Colletes zonatus Viereck, 1903. Amer. Ent. Soc, Trans. 29: 59. 6. 

 Colletes myroni Cockerell, 1908. Entomologist 41: 293. 9. 

 consors mesocopus Swenk. N. S. to N. W. T. south to Alta., Mass., Mich., Wis. Pollen: 

 Unknown, but visits flowers of Geranium, Kahuia, Rubus. 

 Colletes mesocopus Swenk, 1907. Canad. Ent. 39: 364. 9,6. 

 consors pascoensis Cockerell. B. C. and Idaho, south to Calif, and Utah. Pollen: Unknown, but 

 visits flowers of Ne7)iophita aurita, Phacelia, Physalis, Sedum obtusatum. 

 Colletes pascoensis Cockerell, 1898. Acad. Nat. Sci. Phila., Proc. 50: 51. 6, 9. 

 linsleyi Timberlake. Calif. (Blythe). Pollen: Unknown, but visits flowers of the introduced 

 Tamarix. 

 Colletes linsleyi Timberlake, 1951. Wasmann Jour. Biol. 9: 205. 9. 

 nigrifrons Titus. North Que. to N. W. T. and Yukon, south into mts. of northeast Calif., Ariz., 

 and N. Mex. Pollen: Unknown, but visits flowers of Arenaria uuttallii, Drymocallis 

 fissa, Eriogonum lobbii, E. latifolium nudum, E. mariifoliuni, Linum lewisii, 

 Mertensia sibirica, Oxytropis, Physalis, Polemonium, Potentilla ansenana, P. fruticosa, 

 P. glandulosa, P. hippiaiia. Ranunculus, Spiraea densiflora. 

 Colletes nigrifrons Titus, 1900. Canad. Ent. 32: 304. 9. 

 Colletes polemonii Cockerell, 1906. Amer. Mus. Nat. Hist., Bui. 22: 425. 6. 

 Colletes florissantia Cockerell, 1906. Amer. Mus. Nat. Hist., Bui. 22: 425. 6. 

 nitescens Timberlake. Calif. Pollen: Unknown, but visits flowers of Salix. 

 Colletes nitescens Timberlake, 1951. Wasmann Jour. Biol. 9: 187. 6,9. 

 paniscus mertensiae Timberlake. Calif. (Sierra Nevada and White mts.). Pollen: Unknown, but 

 visits flowers of Mertensia ciliata var. stomatechoides. 

 Colletes pa7iiscus mertensiae Timberlake, 1951. Wasmann Jour. Biol. 9: 182. 6,9. 

 paniscus paniscus Viereck. Mont, and Wyo. south into mts. of Ariz., and N. Mex. Pollen: 



Unknown, but visits flowers of Houstonia, Iris 7Hissou7-iensis, Mertensia franciscana, 

 Salix. 

 Colletes paniscus Viereck, 1903. Amer. Ent. Soc, Trans. 29: 60. 6. 

 Colletes oromontis Viereck, 1903. Amer. Ent. Soc, Trans. 29: 61. 9. 

 Colletes pleuralis Swenk, 1906. Ent. News 17: 259. 9, cJ. 

 Colletes grisescens Cockerell, 1930. Amer. Mus. Novitates 397: 4. 6. 



paniscus sculleni Timberlake. Wash, to Mont., south to Utah, Wyo., and Calif. Pollen: 

 Unknown, but visits flowers of Mertensia. 

 Colletes paniscus sculleni Timberlake, 1951. Wasmann Jour. Biol. 9: 183. 6,9. 



