40 PRINCIPAL CACTUS INSECTS OF UNITED STATES. 



The determinations in all cases have been made by the recognized 

 authorities in the different groups. We are indebted to the following 

 entomologists for assistance in this connection: E. A. Schwa rz, 

 H. G. Dyar, W. M. Wheeler. Otto Heidemann, W. D. Pierce, J. C. 

 Crawford, and S. A. Rohwer. Mr. Schwarz also rendered most 

 valuable aid in making suggestions throughout the course of the 

 work and in reading the manuscript and proofs. 



AVe are especially indebted to Prof. T. D. A. Cockerell for furnish- 

 ing complete lists of Opuntia bees and for making many suggestions 

 about the portion of the list dealing with the Coccida?. 



SPECIES WHICH INJURE THE PLANT. 



ARACHNIDA. 



Tetrangchns opuntice Banks. Reported by Mr. David Griffiths as injurious, but 

 not taken in present investigations. 



ISOPTERA. 



Termes flavipes Kollar. Sabinal, Tex., September (F. C. Pratt) ; Falfurrias 

 and Hondo, Tex. (J. D. Mitchell). 



Attacks young Opuntia plants, also Cei - eus; frequently nests in decaying 

 Opuntia and constructs covered galleries on joints. 



HEMIPTERA. 



Liotropis contaminatus Uhler. Tucson, Ariz.; El Paso, Tex. (H. F. Osborn). 



Feeding on fruit of Opuntia fulgida. 

 Chelinidea tabulata Burmeister. Durango, Aguascalientes, and Victoria, Mex. ; 

 Tucson, Ariz. ; Brewster County, Devils River, Oakville, Victoria, Austin, 

 Hondo, and San Antonio, Tex. Throughout the season. 

 Feeds on joints. 

 Chelinidea vittigera Filler. Colorado, Abilene, San Antonio, Knickerbocker, 

 Trinity, Cotulla, Tivoli, Boerne, Encinal, Victoria, San Diego, Kerrville, 

 Dallas. Oakville, Chisos Mountains, Mineral Wells, Hallettsville. Sabinal, 

 Hondo, Falfurrias. Laredo, Fredericksburg, El Paso, and Austin, Tex. 

 Throughout the season. 

 Feeds on joints. 

 Chelinidea sp. Tucson, Ariz., May (F. C. Pratt). 



Feeding on joints of Opuntia fulgida. 

 Largus succinctus Linnaeus. San Antonio, Tex., July (F. C. Pratt). 



Feeding on joints of Opuntia arborescens. 

 Lopidea cuneata Van Duzee. Los Angeles, Cal., June (F. C. Pratt). 



Feeds on joints of Opuntia. 

 Oncerometopu8 nigriclavus Router. Kerrville, Tex.. August (F. C. Pratt); 

 D'Hanis, Tex.. April (.7. D. Mitchell). 

 Feeding on joints of Opuntia. 

 Hadroncniti robuata Uhler. San Antonio, Tex., June (J. C. Crawford). 

 Feeding on joints of Opuntia. 



