BIOLOGY OF AKIZONA WILD COTTON WEEVIL. 3 



W. Dwight Pierce, Mr. E. A. Schwarz, and Mr. H. S. Barber, but the 

 only data we have concerning the occurrence of the plant in Mexico 

 are the records found with the specimens in the various herbaria. 



The various explorations in Arizona have shown the plant to be 

 present in the following localities : Santa Catalina, Santa Rita, Tanque 

 Verde, Rincon, Mule Pass, Huachuca, Chiricahua, Superstition, 

 Bradshaw, Dos Cabezos, and Dragoon Mountains, Globe, and Fish 

 Canyon of the Salt River Valley. (Fig. 1.) So far the plant has not 

 been located in any of the mountain ranges west of Tucson, but 

 explorations have been conducted in only two or three of these and 

 it is quite possible that it occurs there. 



The writer is indebted to Mr. F. L. Lewton, of the Division of 

 Textiles, United States National Museum, for a copy of the data on 

 the specimens of this plant in the following herbaria: Gray Herbarium 

 of Harvard University; Herbarium of the New York Botanic Garden; 

 Columbian Herbarium, New York Botanic Garden; Herbarium of 

 the Academy of Natural Sciences of Philadelphia; and the United 

 States National Herbarium. 



Many of the locality names noted on these are now obsolete and 

 are very difficult to locate, but a general idea of the Mexican dis- 

 tribution of the plant may be secured. Fronteras, Oputo, Tunicachi, 

 and Babusac, all in the State of Sonora, seem to indicate that the 

 plant extends along the mountain ranges in the eastern part of this 

 State and connects with the various localities noted in southwestern 

 Chihuahua. From this point it seems to follow the ranges down at 

 least as far as a point near Guadalajara, Jalisco, Mexico. This is the 

 most southern record the writer has been able to discover. 



So far the weevil has been found only in the Santa Catalina, Rincon, 

 Santa Rita, Tanque Verde, and Dos Cabezos Mountains. Of these 

 ranges the first four adjoin the Santa Cruz Valley, in which Tucson 

 is located, and the last is near Bowie. In the examination of the 

 plants found in the other ranges of the State, no signs of weevils 

 were found but the distribution is certainly more general than that 

 now known. Further explorations will probably demonstrate the 

 presence of the weevils in other mountain ranges, at least in the 

 southeastern part of the State. 



We have no information concerning the presence of the weevil on 

 Thurberia in Mexico, but the writer believes that it will be found 

 extending all along the mountain chain through eastern Sonora, 

 western and southwestern Chihuahua, and then probably connecting 

 directly with the central Mexican territory in which the weevils live 

 on cotton. 



HABITAT OF PLANT AND WEEVIL. 



The studies of the past season were confined to the mountains 

 around Tucson and the most thoroughly worked of these was the 

 Santa Catalina Range, where the local distribution of the plant and 



