10 PROCEEDINGS OF THE NATIONAL MUSEUM vol.75 



is a matter of considerable interest that its altitudinal distribution 

 is so restricted. It has been collected at different times from June 

 until late in September. Its distribution is shown in Figure 7. 



DIAPTOMUS CONIPEDATUS Marsh, 1907 



Z>. conipedatus has been found in only one locality — Slidell, La. 



DIAPTOMUS DORSALIS Marsh, 1907 



D. dorsalh has been found only in the States of Florida and Lou- 

 isiana. In Florida it occurred in Little Lake George, Lake Monroe, 

 Middle Lake, and the St. Johns Eiver. In Louisiana it has been 

 found at Slidell and Guzman. Its distribution is shown in Figure 2. 

 It is probable that it will be found in other States bordering on the 

 Gulf of Mexico. 



DIAPTOMUS EISENI Lilljeborg, 1889 



The distribution of D. eiseni is shown in Figure 1. It was origi- 

 nally found near Fresno in California. Brewer in 1898 reported it 

 from Lincoln, Nebr. Cushman in 1908 found it at Battle Harbor, 

 Labrador. In 1922 Rylov found what he considers a variety of 

 D. eiseni and which he has named D. eisem var. orientaUs in Si- 

 beria. This is a remarkable distribution, the three localities in 

 America being about as far apart as they could be and be on the 

 continent, and the fourth locality being on the opposite side of the 

 world. 



DIAPTOMUS FLORIDANUS Marsh, 1926 



Z>. ftoridmms has been found only in Florida, in ponds in Polk 

 County. 



DIAPTOMUS FRANCISCANUS Lilljeborg, 1889 



In the original description of this species by DeGuerne and Rich- 

 ard, it is stated that it was common in the neighborhood of San 

 Francisco, Calif. It has not been reported in any other locality. 



DIAPTOMUS GATUNENSIS Marsh, 1913 



D. gatimensis M^as first found in the Panama Canal Zone, in the 

 " Black Swamp " near the old line of the Panama Railroad, and in 

 a pond at Bohio. Dodds later reported it in several localities in 

 the Canal Zone, 



DIAPTOMUS JUDAYI Marsh, 1907 



D. judayi has been found in only one locality. Twin Lakes, in the 

 Rocky Mountains of Colorado. 



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