50 PRINCIPAL CACTUS INSECTS OF UNITED STATES. 



Dialictus occidentalis Crawford.. Flagstaff, Ariz., June (F. C. Pratt). 



At Echinocereus. 

 Augochlora neglectula Cockerell. New Mexico. At Echinocactus wlsliseni 



(T. D. A. Cockerell). 

 Agapostemon tenants Cresson. New Mexico. At Cereus polyacanthus and G. 



pendlerif (T. D. A. Cockerell) ; Flagstaff, Ariz.. June (F.<C. Pratt). 

 Perdita megacephala Cresson. Hondo, Tex., April (J. D. Mitchell). 

 Ashmeadiella cactorum Cockerell. Santa Fe, N. Mex., on Cactus radiosus 



neomexicanus (Eng.) (T. D. A. Cockerell). 

 Ashmeadiella opuntiw Cockerell. New Mexico, on Opuntia (T. D. A. Cockerell). 

 Ashmeadiella echinocerei Cockerell. Flagstaff, Ariz., at Echinocereus sp 



(F.C.Pratt). 

 Heriades gracilior Cockerell. New Mexico, on Opuntia (T. D. A. Cockerell). 

 Lithurgus ecMnocacti Cockerell. New Mexico, on Echinocactus wislizeni 



(T. D. A. Cockerell). 

 Lithurgus apicalis opuntice Cockerell. New Mexico. At Opuntia a rborescens 



(T. D. A. Cockerell) ; Za valla County and Sabinal, Tex., and Tucson, Ariz. 



(F.C.Pratt). 

 Megachile populi Cockerell (Syn. : M. opuntiarum Cockerell, fide Cockerell). 



Colorado (T. D. A. Cockerell). 

 Megachile sidalcece Cockerell. New Mexico. 



On Opuntia cngclmanni (T. D. A. Cockerell). 

 Melissodes pallidicincta Cockerell. Colorado (T. D. A. Cockerell). 

 Melissodes opuntiella Cockerell. Brownsville, Tex. (F. C. Pratt) ; Hondo, Tex. 



(J. D. Mitchell). 

 Diadasia australis Cresson. New Mexico and Colorado, on Opuntia arborescens 



(T. D. A. Cockerell) ; Cotulla, Hondo, D'Hanis, and Za valla County, Tex., 



April (F.C.Pratt). 

 D. australis opuntiw Cockerell. Southern California, on Opuntia litloralis 



(Eng.) (T. D. A. Cockerell) ; Los Angeles, Cal.. June (F. C. Pratt). 

 Diadasia australis rinconis (Cockerell). New Mexico. Opuntia cngelmanni 



and 0. arborescens (T. D. A. Cockerell); Runge, Zavalla County, and 



Brownsville, Tex., March (F. C. Pratt); Cotulla. Tex.. April (J. D. 



Mitchell), on 0. leptocaulis and O. lindheimeri; Los Angeles', Cal. (F. C. 



Pratt). 

 Diadasia piercei Cockerell. Beeville, Tex. (C. L. Marlatt). 

 Diadasia bituberculata Cresson. Los Angeles, Cal. 



DIPTERA. 



Mesogramma marginata Say. Hondo. Tex.. April (J. D. Mitchell). 



SPECIES INCIDENTALLY ASSOCIATED WITH THE PLANT. 



OKTHOPTERA. 



Spongophora apicidentata Caudell. Aguascalientes, Mexico, December (F. C. 



Bishopp). 

 ::: Spongophora brunncipennis Serville. Tucson. Ariz. 

 Dichromorpha viridis Sr-udder. Laredo. Tex., May (J. D. Mitchell). 

 Dichopetala brevihastata Scudder. Alice, Corpus Christi, and Maverick County, 



Tex., May (J. D. Mitchell and F. C. Pratt). 

 Dichopetala emarginata Brunner. Bebbronville, Tex., May (J. D. Mitchell). 

 Dichopetala sp. Enclnal, Tex., April. 



