10 



BULLETIN 746, U. S. DEPARTMENT OF AGRICULTURE. 



Avoj^elles Parish. It has not been found in the cane-growing sections 

 of Wharton, Sngarland, and Victoria, Tex. 



It is noteworthy that the territory infested in the United States is 

 mostly within the limits of an area known as the Gulf Strip of the 

 Lower Austral Zone. 1 This strip along the coast is indicated in the 

 accompanying map (fig. 1), which shows also the infested regions. 



That the insect is found only in three such widely separated places 

 as the southern parts of Texas, Louisiana, and Florida may be ex- 

 plained by the fact that it is a tropical species and probably was 

 brought to these three cane-growing sections independently in ship- 

 ments of seed cane. Where sugar cane is only an incidental crop it 



Pig. 1. — Map showing distribution of the sugar-cane moth borer (Diatraea saccliaralis 

 crambidoidca) in the United States. The area below the line of dashes is the " Gulf 

 Strip." Note that the territory infested is practically well within the limits of this 

 biological zone. 



does not occur, although a nearly related species attacks corn and very 

 seldom sugar cane in Georgia, northern Florida, North Carolina, 

 South Carolina, and Virginia (75). 



SPECIES OF DIATRAEA. 



Dr. Harrison G. Dyar (45) records three species of Diatraea in the 

 United States. These are : 



Diatraea saccliaralis saccliaralis Fabricius. French Guiana, Cuba, Trinidad, 

 Peru. Also a female from southern Florida. Trobably Santo Domingo. 



Diatraea saccliaralis cramMdoides Grote. Mexico, numerous localities ; Gulf 

 States and lower Mississippi Valley. 



Diatraea zeacolclla Dyar. North Carolina, South Carolina, Virginia. 



Diatraea lineolata Walker. Cuba, Trinidad, the Guianas. Venezuela, Costa 

 Rica, Mexico, and southern Arizona. 



1 Merriam, C. Hart. Life Zones and Crop Zones of the United States. 

 Agr. Div. Biol. Surv. Bui. 10. 79 p., 1 col. map. 1898. 



U. S. Dept. 



