1955 1 Gregg — V eromessor lobognathus 47 
in the recording of geographical data and always, it seems 
to this author, a locality should be given that is more pre- 
cise than a mere county record. Some counties in western 
states are larger in area than whole eastern states and, 
moreover, they frequently encompass tremendous altitudin- 
al changes. Anything less than the nearest large town, 
mountain peak, large lake, canyon, distance in highway 
miles, elevation or other means of pinpointing a site on 
a large scale map is to be deplored and should be ac- 
cepted only with caution. 
In 1953 Creighton suggested that the locality labels of 
the cotypes of V. lobognathus may be incorrect. While 
this possibility has not been overlooked, I feel that the 
recent rediscovery of the species in Colorado, even though 
at a widely separated station, lends credence to Cockerell’s 
Glenwood Springs labels, and we now have little reason 
for doubting their validity. 
On July 22, 1952, thirty-six years after its original 
discovery, V eromessor lobognathus was retaken by me at 
Owl Canyon, Colorado, approximately twenty miles north- 
west of Fort Collins. The nest was situated under a rock 
in pinyon-cedar woodland at an elevation of 6,100 feet. 
From the colony, 85 workers with brood were obtained, 
and the ants have been compared with the cotypes of 
lobognathus in the museum and found to be unquestionably 
conspecifie with them. Only insignificant differences be- 
tween them could be detected. No winged castes were 
secured. 
On casual examination, the specimens look so much like 
Pogonomyrmex occidentals, that until they were brought 
back to the laboratory, they were mistaken for that species. 
However, the reticulate nature of the thoracic and the 
cephalic sculpture, the spatulate proximal end of the scape, 
the pronounced saddle-like depression of the meso-epinotal 
suture, and the broad, sessile postpetiole easily differ- 
entiate V. lobognathus from P. occidentals. It is the sim- 
ilarity in stature, in pilosity, in color, and the possession 
of a psammophore in both species that may confuse the 
unwary. Without magnification, the sculpture of these 
ants is also astonishingly similar. Wheeler and Creighton 
