132 U.S. NATIONAL MUSEUM BULLETIN 25 6 



Carolina, Georgia, Alabama, Tennessee, and Louisiana, and from 

 Baja California in Mexico. The following notes taken from the Board's 

 records indicate its general occurrence: 



United States: Florida: Northern portion only, especially around Gains- 

 ville. Texas: All along the Gulf Coast from Brownsville to Galveston; Laredo, 

 Del Rio, Uvalde, San Antonio, Rocksprings, Brownwood, Austin, Palestine, 

 Dallas, Plainview, Amarillo, Sanderson, Davis Mountains, new Mexico: 

 Carlsbad, Organ Mountains, and northeastern districts. Oklahoma: Tyrone, 

 Guymon. Kansas: Liberal, Garden City, Scott City, Wallace. Colorado: 

 Trinidad, Boulder, Pueblo, Litdeton, Fort Morgan, Denver. Nebraska: North 

 Platte. WYOMING: Cheyenne, Casper, Douglas, idaho: St. Anthony, Blackfoot. 

 Utah: Salt Lake City, Nephi, Beaver, Toqueville. Arizona: Lees Ferry, Ash 

 Fork, Jerome, Tucson, Douglas. California: Los Angeles, Oceanside, Coachella 

 Valley, San Diego, Bakersfield. 



Mexico: tamaulipas: Throughout the State from the Rio Grande to Tampico 

 and Pahnillas. nuevo leon: Throughout the State, coahuila: Monclova. 

 chihuahua: Chihuahua City, sinaloa: Culiacan. 



The distribution of C. vittiger and C. tabulata overlaps in northern Mexico 

 and southern Texas. The former is especially common in the Mexican 

 State of Tamaulipas, along the Texas coast, and generally in the 

 eastern half of Texas to the northern border. It occurs abundantly 

 in Wyoming and Idaho; at Blackfoot in Idaho thousands of larvae 

 were observed in June 1926. In some years it is also prevalent in 

 Southern Arizona. 



Both adults and larvae exhibit considerable variation in color, and 

 some authorities have divided the species into subspecies and varieties. 

 In the form occurring in the gulf coast section of Texas as far inland 

 as Uvalde, and in the Mexican States of Tamaulipas and Nuevo Leon, 

 the adults are light-colored, being a dull yellow with yellow legs. In 

 the dark forms the pronotum is yellow, often with black margins, 

 the elytra are mostly dark, and the legs are partially black. The rel- 

 ative amount of black and yellow in the dark forms and the intensity 

 of the coloration are not constant in these dark forms, which occur 

 in Florida, and throughout Northern Texas to Idaho, Utah, northern 

 Arizona, New Mexico, California, and Chihuahua. Both light and 

 dark forms are found near Galveston, Texas. Around Tucson, Arizona, 

 the color approaches that of the coastal Texas form. Examples from 

 Culiacan in the west-coast State of Sinaloa are light in color and are 

 unusually large. The larvae differ in color, particularly in the latter 

 instars; the legs and antennae may be black or mainly red; the ab- 

 domen may be green-black, dark green, red, or even dark crimson. 

 This degree of color variation is found in the same locality. 



Unlike C. tabulata, C. vittiger is gregarious and, particularly so in the 

 larval stages. Not only do the larvae from one batch of eggs feed to- 



