AKT. 14 



NORTH AMERICAN COPEPODS MARSH 



13 



limited in its distribution. With the exception of a single specimen 

 reported by Schacht from the Yellowstone National Park it does not 

 occur west of Wisconsin, nor south of the southern borders of Wis- 

 consin, Michigan, and New York, except in Lake Maxinkuckee in 

 northern Indiana. New BrunsAvick and Lake Nipigon limit its con- 

 tinental distribution in the north. It is typically a cold-w^ater form 

 and in the more southern parts of its range is largely confined to the 

 deeper lakes. Its distribution is shown in Figure 5. 



Figure 5.— Distribution of Diaptomus minutus Lilueborg (O), D- mississippiensis Marsh (D), 



D. NOVAMEXICANUS HeRRICK (A), D. NUDUS MaRSH (O). AND D. TYRELLI POPPE (+) 



DIAPTOMUS MISSISSIPPIENSIS Marsh, 1894 



D. mississippiensis was described from material collected by Pro- 

 fessor Birge at Jackson, Miss. ; it was later found in collections made 

 by him at Guzman and Slidell in Louisiana. Turner, 1910, found it 

 at Augusta, Ga., and Schacht, 1897, reported it from Lake Maitland, 

 Fla. Mr. E, Foster has Avritten to the author that he found it in two 

 localities near New Orleans, but not in any numbers. Its distribution 

 is shown in Figure 5. 



