REVISION MALACOSOMA HUBNER IN NORTH AMERICA 91 



Adults from the Pacific populations often are somewhat darker 

 (figs. 128 and 134) than adults from otiier areas, and have had the 

 infraspecific name "erosum" applied to them in the past, but sunilar 

 dark adults can be found in other populations (figs. 127, 133, and 135). 

 In addition, there are more striking differences in the larvae from 

 within the Pacific populations (compare figs. 339 and 340) than have 

 been found elsewhere in North America. Therefore, recognition of 

 the Pacific populations as a subspecies is not warranted by the informa- 

 tion currently available. 



There certainly must be variations in the physiological adaptations 

 of the various populations of disstria which occur in such climatically 

 different areas as northern Canada and southern Texas, but these 

 differences are not documented, and the change from one population 

 to another would no doubt be a gradual one anyway. Until much more 

 additional information is obtained concerning the various populations 

 that make up disstria it is sufficient to refer to them by geographic 

 localities rather than the use of subspecific names. 



Specimens Examined. — 3405 (Museum specimens — 1795 males, 564 fe- 

 males, 907 larvae; reared specimens — 80 males, 59 females, plus larvae and 

 tgg masses). See Appendix I for data on collections made during this study. 

 In figure 1 individual localities have not been plotted for the eastern states 

 solidly covered with circles, but disstria should be found throughout all of these 

 states. The following list includes only localities from states or provinces which 

 lie outside this area. 



United States. — Arizona: Dewey. California: Alameda; Berkeley; 

 Bloomfield (Sonoma Co.); Calistoga; Carmichael; Chico; Crescent City; 

 Eldridge (Sonoma Co.); Eureka; Folsom; Fortuna (Humboldt Co.); Fresh- 

 water (Humboldt Co.); Glen Ellen; Guerneville; Healdsburg; Lake Tahoe; 

 1 1 mi. N. Laytonville; Lebec;Lodi;Longvale; Los Gatos;Mad River at Maple 

 Creek (Humboldt Co.); Martin's Ferry (Humboldt Co.); Modesto; Napa; 

 Napa Co.; Palo Alto; near Pepperwood (Humboldt Co.); Petaluma; Ricks; 

 San Antonio Creek (Sonoma Co.); St. Flelena; 4 mi. N. St. Helena; Santa 

 Cruz Mountains; Santa Rosa; Sonoma Co.; Trinity Co. Colorado: Denver; 

 Hayden Mountains (Ouray Co.); Maybell; Valley View Lodge, 10 mi. S. 

 Steamboat Springs. Florida: Gainesville; Lakemont; Leesburg; Orlando; 

 Pensacola; Quincy; Siesta Key, 9 mi. S. Sarasota, idaho: Glen Ferry; Island 

 Park (near W. Yellowstone); 4th of July Creek, N. of Salmon; Moscow; 

 Rexburg; Rock Island; Sandpoint; Wallace. Kansas: Onaga; Riley Co. 

 MONTANA: Avalanche Creek, Glacier N.P.; Avon; Belton; Bozeman; Florence; 

 Hot Springs; Livingston; Montana Experiment Station (Hill Co.); Poplar; 

 Trout Valley. Nebraska: Florence, new Mexico: Cedar Greek Camp, 2 

 mi. N. Ruidoso; High Rolls; Simpson's Ranch, 5 mi. E. La Jara. Oklahoma: 

 Hinton. Oregon: Albany; near Baker; Coquille; Corvallis; 5 mi. N. Corvallis; 

 2 mi. S. Dayton; Gearhart; Gervais; Jennings Lodge (Clackamas Co.); 

 279-280—68 7 



