96 
Psyche 
[September 
tains in Arizona and the Black Range in New Mexico. 
Further east in New Mexico the range swings north again 
in the Rio Grande Valley and the Tularosa Valley. The 
range in southeastern New Mexico is at present con- 
jectural, for there are no published records for New 
Mexico east of Alamogordo. But the presence of cockerelli 
in Palo Duro Canyon in the Texas Panhandle makes it 
seem likely that the range runs northeastward through 
the Staked Plain region. 
The eastern boundary of the range of albisetosus is 
very little known but it seems safe to say that it does 
not coincide at all with that of cockerelli. The eastern- 
most record for albisetosus to date seems to be the colony 
which the writer took in 1933 at Cernas Ranch in the 
Chisos Mountains of Texas. This station lies about ten 
miles west of Longitude 103°. The Chisos Mountains are 
so close to the Sierra del Carmen and the Serranias del 
Burro in northern Coahuila, that albisetosus can scarcely 
be absent in the Mexican ranges. But that it extends far 
south in Coahuila seems very doubtful. We failed to take 
it in the Sierra Hermosa de Santa Rosa, a small range 
which lies just south of those previously mentioned. 
Neither was albisetosus secured in the mountains around 
Saltillo, although cockerelli was taken there. Since the 
collections around Saltillo were carried up to the 7200 
foot level, the vertical range of albisetosus was more than 
covered. It is hard to see why the insect should be absent 
in the mountains of southern Coahuila, but this appears 
to be the case. 
The eastern boundary of the range of cockerelli is much 
better known. There are at present seven records extend- 
ing from Palo Duro Canyon, Texas (Lat. 35°), almost to 
Saltillo, Coahuila (Lat. 26°). Six of these records are 
within twenty-five miles of Longitude 101°, the seventh 
is only ten miles west of Longitude 102°. This compar- 
atively smooth eastern boundary is certainly not determined 
by topography. Two of the stations are on the Edwards 
Plateau, three in the Rio Grande Valley and two in the 
mountains of southern Coahuila. Since cockerelli can occur 
in the Rio Grande Valley at elevations of 1000 feet (Del 
