50 PRINCIPAL CACTUS INSECTS OF UNITED STATES. 



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



At Echinocereus. 

 Augochlora neglectula Cockerell. New Mexico. At Echinocactus voislizeM 



(T. D. A. Cockerell). 

 Agopofttemon texanus Cresson. New Mexico. Al Cereus polyacanthus and c. 



pendleri? (T. D. A. Cockerell) ; Flagstaff, Ariz.. June (P. C. Pratt). 

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

 Ashnu adiella cactorum Cockerell. Santa IV. N. Mcx.. on Cactus radiosus 



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

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

 A8hmeadiella echi/nocerei Cockerell. Flagstaff, Ariz., at Echinocereus sp 



( r. c. Pratt I. 

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

 Lithurgus echinocacti Cockerell. New Mexico, on Echinocactus wislizeni 



(T. 1). A. Cockerell). 

 Lithurgus apicalis opuntiw Cockerell. New Mexico. At Opuntia arborescens 



(T. l>. A. Cockerell) : Zavalla County and Sabinal, Tex., ami Tucson, Ariz. 



(F. C. Pratt). 

 Megachile i»>i>nli Cockerell (Syn.: M. opuntiarum Cockerell. fide Cockerell). 



Colorado (T. D. A. Cockerell). 

 Megachile sidalcew Cockerell. New Mexico. 



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

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

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



i J. I). Mitchell). 

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



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



April (F. C.Pratt). 

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



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

 Diadasia australis rinconis (Cockerell). Now Mexico. Opuntia < ngt Imanni 



and 0. arborcscens (T. D. A. Cockerell): Runge, Zavalla County, and 



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



Mitchell), on O. Icptocaulis and O. lindheimeri; Los Angeles, Cal. (F. C. 



Pratt). 

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

 Diadasia bituberculata Cresson. Los Angeles, Cal. 



DIPTEKA. 



Mesogramma marginata Say. Hondo, Tex.. April (J. 1 >. Mitchell). 



SPECIES INCIDENTALLY ASSOCIATED WITH THE PLANT. 

 OKTHOPTEB \. 



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



Bishopp). 

 gophora brunneipennis Serville. Tucson, Ariz. 

 Dichromorpha viridis Scudder. Laredo, Tex.. May (J. D. Mitchell). 

 Dichopetala brevihastata Scudder. Alice, Corpus Christ i. and Maverick County. 



'lex.. May i.l. l). Mitchell and F. c. Pratt). 

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

 Dichopetala sp. Encinal, Tex.. April. 



