122 
Bulletin Wisconsin Natural History Society. [Vol. 10, Nos. 3-4. 
southern part of the state (Pearse), and in Minnesota it was 
found in a tributary of the Mississippi river in Hennepin County. 
In Wisconsin previously reported from Milwaukee. 
Regarding its occurrence in Ohio, Williamson refers to it as 
“an inhabitant of mud-bottomed streams and pools, from which 
the water disappears early in the season.” 
Three females with eggs were taken in the exceptionally early 
spring of 1910 from a pond of this type in Johnson’s woods, Town 
of Wauwatosa, on March 20th, and four days later one male and 
three females, two of which carried eggs, were obtained from the 
same pond. On the first mentioned date the greater part of the 
surface of the pond was still covered with melting ice, but there 
was a broad belt of open water along the margin. At Ann Arbor, 
Mich., females with eggs were found on April 18, 1909 (Pearse). 
In the neighborhood of Milwaukee this species seems to be 
rather common, and we have specimens from two different ponds 
in Johnson’s woods taken on the dates given above, and on April 
2, 1910, and April it, 1911, as also from ponds in Mitchell’s woods 
southwest of the city captured April 2, and April 13, 1910. 
As already mentioned in the discussion of C. blandingi acntus, 
males and females of C. immunis were found in a creek running 
through the prairie near Corliss in Racine Co. on May 15, 1910. 
Above the juncture of the Chippewa river and the Missis¬ 
sippi river the latter broadens out to a lake-like body of water 
called Lake Pepin. Along the Wisconsin side of Lake Pepin 
north of Maiden Rock in Pierce Co., the water is extremely shal¬ 
low, and in many places the bottom is covered with a dark, sticky 
mud. In the summer of 1910 the water in the Mississippi river 
was extremely low, and males and females of C. immunis were 
found on August 3, and 9, in burrows along the wet shore, quite 
a distance from the lake. Maiden Rock is about 50 miles south¬ 
east of Hennepin Co., Minnesota, the only locality in that state 
from which C. immunis has been reported. 
C. (Bartonius) diogenes Girard. This, our typical chimney¬ 
building crawfish has a wide range of distribution, extending from 
the Atlantic coastal plain in the east -through the central states 
to Wyoming and Colorado in the west, and southward as far as 
Louisiana (Ortmann). 
