34 PROCEEDINGS OF THE ACADEMY OF [1896, 



CAPPARIDACEiE. 



(4). Cleome serrulata Piirsh, This is not found growing wild 

 at Las Cruces, but it abounds from Albuquerque to Santa Fe 

 and northward into Colorado, being visited in great numbers 

 by Perdita zebrata. There is a not uncommon white-flowered 

 form ( C. albiflora) which I observed at WatrouB, N. M., and 

 other places. 



While P. zebrata is the only Perdita of the Cleome, it has to 

 compete with numerous bees of other genera. At Santa Fe, 

 on August 2d, I noted that Nomia punctata was in full force on 

 ihe^Cleome, its hind legs loaded with the green pollen. Other 

 Cleome bees at Santa Fe are Melecta miranda, Anthophora, 

 Megachile, Melissodes and Bombus. At Albuquerque a Cal- 

 liopsis is common on the Cleome ; and I saw at this locality 

 on August 16th, a humming-bird visiting it. 



LEGUMINOSJE. 



(5). Prosopis juliflora var. glandulosa (Torrey). The mes- 

 quite furnishes Perdita exclamans and P. punctosignata. Mr. 

 Alfred Holt has also taken an Anthidium on mesquite at Las 

 Cruces, 



It will be noted that the generic name of this plant is the 

 same as that of a genus of bees. This inconvenience might be 

 avoided by spelling the bee-genus Pi'osapis, as has already 

 been done by Mr. Ashmead (Hym. Colo., p. 31). The botan- 

 ical genus has priority. The mesquite extends in modified 

 form to sea-level in the neotropical region ; it is, in fact, essen- 

 tially a neotropical type. 



ZYGOPHYLLACEJE. 



(6). Tribulus maximus L. Visited by P. pectidis. The plant 

 cannot be other than maximus, but it does not agree in detail 

 with published descriptions. I have found the plant (though 

 not the bee) as far north as La Junta, Colorado. 



(7). Larrea DivARiCATA var. TRiDENTATA (DC). At San Mar- 

 cial were found on this P. marcialis, P. larrece, P. larrearum 

 and P. semicmndea. The P. larrece is colored yellow like the 

 flowers of the plant. The genus Larrea consists of four or 

 five species, confined to the Mexican region and the Argen- 

 tine Republic. Our species is a variety of one of the Argen- 

 tine ones. 



EUPHORBIACE^. 



(8). Croton texensis (Klotzch) Muell. Arg. At Albuquerque 

 I found numbers of P. crotonis on this. The same plant is 



