56 
Psyche 
[June 
surprising fact that in most of the longer nest series 
there were a few workers which had a dull, densely 
punctate postpetiole like that of townsendi. In short, 
there is no constancy in the sculptural characteristics 
which were used as the basis for the recognition of 
townsendi. The case offers a close parallel to that of 
Olsen’s salinus, a species which was also based on a 
single specimen which had a densely sculptured gaster. 
M. R. Smith has recently shown (4) that salinus is a 
synonym of occidentals, being nothing more that an in- 
consequential variant which occurs in certain nests at 
the western end of the range of that wide-spread species. 
It appears that we must take the same stand with town- 
sendi. Since townsendi is nothing more than a minor 
variation which occurs at random over a part of the range 
of imberbiculus, it is best treated as a synonym of 
imberbiculus. 
Presented below is a list of the stations at which imber- 
biculus and pima have been taken. The previous records 
for townsendi are included with those for imberbiculus. 
Where possible elevational data for the older records 
have been supplied from topographic sheets. The writer 
is aware of the difficulties inherent in this method, but 
the stations so treated were in areas which left little 
doubt as to the elevation involved. The records for which 
no collector’s name is given are those of the writer. 
Elevational data for these stations were secured from 
altimeter readings at the station, which were checked then 
or later against topographic sheets. 
Pogonomyrmex ( Ephebomyrmex ) imberbiculus Wheeler: 
California: Yaqui Well, Anza Desert State Park (1400'). 
Arizona: Kofa Mountains, Palm Canyon (1600') ; Ajo 
Mountains, Alamo Canyon (2300') ; Santa Rita Moun- 
tains, mouth of Madera Canyon (4800') ; Tucson (2400') 
W. M. Wheeler; Pinaleno Mountains, Fort Grant (4800') 
Cornell Univ. Exped. ; Whetstone Mountains, Dry Canyon 
(5000') ; Huachuca Mountains, Garden Canyon (5800') ; 
Safford (3000'). 
