Diaptomus Pseudosanguineus Sp. Nov. 5 



COPEPODA 

 FAMILY CENTROPAGIDAE 

 GENUS DIAPTOMUS WE8TWOOD 



1. DIAPTOMUS ASHLANDI Marsh 189J. 



DiaptomuB aahlandi, Marah. '93. p. 198. pi. S, fig. 11-lS. 

 Diaptomut aahlandi, Herrlck ft Turner. '95. p. «0. pL «. flf. 4-*. 

 Diaptomua aahlandi. Schacht, '97. pp. 1C7-1C9. pi. S2. tig. 1-4. 

 Common. Found in lakes, no-outlet ponds and marshes, throush a 

 temperature range of 16-35*C. Usually abundant. 



2. DIAPTOMUS OREGONENSIS. LlllJeborR IStt. 



Diaptomua oregonenaia, Herrick * Turner. '9S. pp. 7S. 71. pi. 4. 



tig. 7-12 : pi. 9. tig. I. 

 Diaptomua oregonenMa. Schacht. '97. pp. lil-IS4. pL S9. fl*. 1. t. 

 Found three times in this district In no-outlet ponds: In one case eol- 

 lected from the midst of vegetation ; in the other two c ases the ponds con- 

 tained no higher plants. The temperature of the water ranged from IS- 

 20*C. The PH value ranged from 7.6 to 8.2. Abundant In aacb ca«*. 

 S. DIAPTOMUS PAL.LJDUS Herrick 1879. 



Diaptomua pallidua, Herrick A Tumsr. 'IS. pp. 7t. T4. pL 4. flff. 



1-6 ; pi. 5, tig. 10 ; pi. 12. fig. 17. 

 Diaptomua pallidua, Schacht. '97. pp. 144-146. pL 27. Off. S. 

 Encountered in this region but once. In June. 1920. when It was abund- 

 ant in a no-outlet pasture pond. 



4. DIAPTOMUS PSEUDOSANGUINEUS. sp. Bor. (pi. IS). 

 For description consult the flrst section of this papsr. 



5. DIAPTOMUS SANGUINEUS Forbes 1876. 



Diaptomua aanguineua, Forbes. '76. pp. 14. 16. 2t. llc. 24, 21-20. 

 Diaptomua aanguineua, Herrick ft Turner. '9B. p. 71. pL 12. tig. 12. 

 Diaptomua aanguineua, Schacht. '97. pp. 122-127. pi. 22-26. 

 Collected but once in this district, in a no-outlet pond in 1909. 



6. DIAPTOMUS SICILIS Forbes 1882. 



Diaptomua aicilia, Herrick ft Turner. '91. pp. tO. «1. pL I. flg. 1-7: 



pi. 13, fig. 18. 

 Diaptomua aicilia, Schacht, '97. pp. 122-124. pi. 21. fig. 1-2. 

 Found in April, 1909, in large numbers in the open waters of a large 

 lake, the temperature of which was 11*C. The water was free from vege- 

 tation and there were practically no algae. The altitude of the lake is 440 

 feet Not found since although frequent collections have been made in the 

 same part of the lake. 

 7. DIAPTOMUS STAGNALIS Forbes 1882. 



Diaptomua atagnalia, Forbes. '82. pp. IS, 16, 22. fig. 24, 22-20. 

 Diaptomus atagnalia, Herrick ft Turner. '9S. pp. 71. 72. pL 12. tg. 



8-10. 

 Diaptomua atagnalia, Schacht. '97. pp. 128-141. pi. 28, fig. 2. 

 Found in this district only once, in June. 1920. in a shallow, no-outlet 

 pond free from vegetation. 



FAMILY CYCLOPIDAE 

 GENUS CYCLOPS O. F. MUELLKR 

 8. CYCLOPS ALBIDUS Jurine 1820. var. tenuicornis Sars 1863. 



Cyclops aignatua, var. tenuicornis, Herrick ft Turner, '95. pp. lOS. 



107. pi. 15. fig. 5-7 ; pi. 20. fig. 1-7 ; pi. 33, fig. 1. 2. 



Cyclops albidus, E. B. Forbes, '97. pp. 47-49. pi. 13. 



A species widely distributed in this district, in marshes, small temporary 



ponds, small no-outlet ponds, and lakes. It is found where vegetation does 



and does not exist, occurring in water ranging from 10'-25'C. and having 



PH values ranging from 7.2 to 8.0. In some specimens the hyaline plate 



