1915| Interesting Western Odonata 303 
rocks are a coarse granite, which readily disintegrates into a 
very coarse sand, that is creamy white with numerous dark 
brown and black grains. The bed of the stream, where shallow, 
is composed of this coarse sand, giving it a peppered or even 
checkered appearance. In the deeper and swifter channels this 
sand is displaced by gravel and rocks. The nymphs of Palto- 
themis apparently go thru from two to three years of nymphal 
life before emerging. For the first two years the young nymphs 
crawl about over the coarse spotted sand of the shallows, but in 
the last year they live altogether in the deeper water. During 
the early stages while the young are living on the spotted grit 
bottom they have a very striking black and white checkered 
coloration, which lets them blend wonderfully well into their 
background of checkered sand; but in the later stages when they 
are on an ordinary bottom in the deeper channels they have the 
usual olive brown of most large odonate nymphs. 
CORRECTION. 
(Athysanus villicus Crumb=) Deltocephalus colonus Uhler 
Too late to recall the description, I learn that my Athysanus villicus 
is a synonym of Deltocephaius colonus Uhler. This species was described 
from the island of St. Vincent. 
S. E. Crump. 
