THE CANADIAN ENTOMOLOGIST. 36o 



Diadasia diiiilniita, Cresson. 



Santa Fe and Las Vegas, abundant at flowers of Malvaces' ; caught 

 at Las Vegas on Sphceralcea Fendleri lobata, S. atspidata, Malvastrtim 

 coccineiwi, M. dissectiim and Sidakea iieomexicana, on the last by Mr. A. 

 Garlick. 



Diadasia apacha^ Cresson. 



Mesilla Valley, abundant at flowers of Sphceralcea Fe?id/eri lobata. 

 Heretofore recorded as D. dimiimta (Trans. Am. Ent. Soc, XXV., 193). 

 Its nesting habits are recorded in Nature, Sept. 17, 1896, p. 461. 



D. di?ninuta was described from the ,^ . apacha from the 9 ; they 

 are perhaps only subspecifically distinct. The 9 diminuta is distinguished 

 from apacha by the dark tegulaa and the thorax broader between the 

 wings ; the stigma also averages darker. The D. diminuta recorded from 

 luarez, Mexico (Cat. Abejas de Mexico, p. 14), is apacha. 

 Ceutris Cockerelli, Fox, Pr. Acad. Nat. Sci. Phila., 1899, p. 68. ?. 



I have little doubt this is the true ? of C. lanosa; i. e., of the Mesilla 

 Valley insect regarded as lanosa. 

 Centris rhodopus. V2,x. pulchrior, n. var. 



Mesilla Park, N. M., June 24, one $. This is the $ variety 

 described by Mr. Fox in Proc. Acad. Nat. Sci. Phila., 1899, p. 68, but not 

 named. I think it is probably a distinct species. The legs are ferruginous 

 (the hind femora blackish beneath at base), and the basal joint of the hind 

 tarsi has long white hair like that on the tibia. The hind margins of the 

 abdominal segments have distinct pale hair-bands. 



Centris Hoffmanseggice, Ckll., Am. Mag. Nat. Hist., April, 1897, p. 395. 

 S (not ?). 



Mr. Fox regarded the insect which I had described as ? C. lanosa 



as the true 9 of C. Hoffmanseggice; but it differed from the c? in its 



larger size, and entirely different pubescence of the legs, so I thought to 



treat it as a distinct species. It appears to be fond of the flowers of the 



mesquite ( Prosopis glandulosa), on which it was again taken on May 15 



of the present year, by Miss Nora Newberry. On May 16, at Mesilla 



Park, individuals of Centris were seen hovering in the air, but not visiting 



flowers. They were so agile that it was only with considerable difficulty 



that three were caught. These proved to be males of C. Hofmanseggice, 



but larger (133/2-14 mm.) than the single male hitherto known. At the 

 same place, the females, their hind legs covered with orange pollen, were 

 found entering their nests, which were tunnels in the ground, about two 



