(Crotalus molossus molossus)
These snakes are usually referred to by local herpers as either "molossus" or "blacktails".
The blacktails are an attractive rattlesnake. There is some variation in their coloration throughout the range. The specimens I have found in the Hill country have been very light in coloration, some almost white.
They are not uncommon throughout the range of this work. In October, especially in the Big Bend region, they are fairly common since this is their breeding season. It is not uncommon to find them in pairs at this time.
This was my first molossus, collected near Van Horn, Culberson County, in 1972.
This blacktail was found on Black Gap road, southeastern Brewster County.