1976] 
Peck — Beetle Genus Echinocoleus 
55 
nest of Pogonomyrmex rugosus Emory, a harvester ant (F. G. 
Werner determination). Paratypes: One male and one female with 
same data (SBP colln.). 
Diagnosis. The species is distinguished by its larger size, more 
transverse pronotum without distinct striae or semi-erect coarse 
hairs, and more widely spaced elytral striae. The species is found 
in lower elevation Sonoran desert shrubland habitats, in association 
with Pogonomyrmex ants. 
Figures 1-4. SEM photomicrographs of Echinocoleus sonorensis. 1-3. Dorsal, 
ventral, and lateral views respectively. 4. Lateral view of elytra showing long, semi- 
erect hairs. 
