6o 
Psyche 
[March 
Fig. 7. Spatial distribution (based on material examined) of Celotes 
nessus — southwestern United States and northern Mexico. Rivers and the 
borders of states are shown. Type locality indicated by arrow. 
huahua, as well as Coahuila, and, in all likelihood, beyond these 
states. Indeed, either limpia or nessus (see N omenclatural epilogue 
below) was long ago reported from Durango city (Godman and 
Salvin 1899), and both species probably range well down the Central 
Plateau of Mexico. The distribution of limpia appears to lie within 
that of nessus. 
Over its much broader distribution, nessus occurs from sea level 
to somewhere between 5000 and 6000 feet; limpia , with its strictly 
interior distribution, is now known from an elevational range of 
1900-5700 feet. In montane regions of the southwestern United 
States, both skippers are species of alluvial fans, foothills, lower 
canyon reaches, and lower elevations generally; they avoid higher 
elevations. 
The distribution of nessus in the United States is not perfectly 
known. The skipper may conceivably occur in the New York and 
Providence mountain region of southeastern California, in southern 
Nevada, in southern Utah, possibly in extreme southwestern or south- 
eastern Colorado, and certainly in considerably more of New Mexico 
