CRA.\TISHES. 379 



Illinois, Michigan, Wisconsin, Minnesota, Iowa, Missouri, Kansas and Nebraska, 

 into Colorado and Wyoming.' To the eastward of Lorain County, Ohio, it 

 has hitherto been recorded from only two localities, both in the state of New 

 York: in 1891 Mr. Gerrit Smith Miller, Jr., brought me three specimens which he 

 found in July of that year in a small stream flowing into Oneida Lake; these were 

 recorded by me in 1898 (Proc. U. S. Nat. Mus., 20, p. 654) ; in 1906 Dr. Ortmann 

 (Mem. Carnegie Mus., 2, p. 467) called attention to specimens in the New York 

 State Museum which had been taken by Mr. F. C. Paulmier in Rensselaer Lake, 

 Rensselaer Co., N. Y. I can now add to the New York stations for this 

 species the following: — pond near the mouth of Cattaraugus Creek, and Silver 

 Creek, Chautauqua Co. (U. S. N. M. Nos. 22,417, 22,408); Fish Creek, Buffalo, 

 Erie Co. (U. S. N. M. No. 22,418) ; and Stony Island, at the eastern end of 

 Lake Ontario, Jefferson Co. (U. S. N. M. No. 22,409). 



My first knowledge of this species as an inhabitant of Massachusetts was 

 obtained when I was walking across the mud-flats at the upper end of Pontoosuc 

 Lake on the 11th of November, 1899. The numerous mud-towers or "chim- 

 neys" here rising above the level of the flat at once Isetrayed the abode of 

 some kind of burrowing crayfish. Although the soil was then frozen so as to 

 make exploration difficult, I satisfied myself that the builders of the little mud- 

 towers had withdrawal to their brumal retreats in the deeper waters of the Lake, 

 lea\'ing behind them onh^ one dead companion, a first-form male C. immunis 

 spinirosiris (M. C. Z. No. 6,687). Here the matter rested until, during a ^asit 

 to Berkshire in 1911, I ascertained that this crayfish was abundant on the 

 12th of August among the water-weeds at the head of Pontoosuc Lake. Two 

 days later I searched for it at the northern end of Onota Lake in Pittsfield and 

 again found it in altogether similar surroundings, albeit in much smaller num- 

 bers than in the neighbouring Pontoosuc or Lanesborough Pond. 



On the 15th of June, 1912, I again collected this crayfish at the outlet of 

 Goodrich's Pond and in the Housatonic River just above Pomeroy's Mills, 

 in Pittsfield. 



These specimens from Berkshire Co., Mass., agree in most respects with 

 the types of C. immunis spinirosiris, which were collected in Obion County, 

 Tennessee. The rostrum in the Massachusetts examples tapers a little more 

 between the base and the ante-apical teeth and, the antennal scales are a little 

 shorter in proportion to the length of the rostrum. Compared with the typical 



' There are two specimens of C. immunis, cf f- II- and 9 , in the U. S. National Musi-inn, No. 3,2.57, 

 labelled as coming from Orizaba, Mexico, through Professor Sumichrast (Aw. /60t>^ i^ar. 30, l67o^ 



