Smithsonian miscellaneous collections . h tyrrelli has been unfortunate in obscuring the patternof its distribution and its closer relationship to the other species ofthe group. Specimens reported by Hooper as tyrrelli from westernCanada have been examined and identified as pribilojensis. DIAPTOMUS (EUDIAPTOMUS) GRACILIS Sars Diaptomus gracilis is a well-known Eurasian species new to NorthAmerican fauna. It has been found recently in several of my Alaskancollections. It appears to be common in the Arctic regions of Alaska,having been found on the western coast (lakes of the lower YukonRiver an
Smithsonian miscellaneous collections . h tyrrelli has been unfortunate in obscuring the patternof its distribution and its closer relationship to the other species ofthe group. Specimens reported by Hooper as tyrrelli from westernCanada have been examined and identified as pribilojensis. DIAPTOMUS (EUDIAPTOMUS) GRACILIS Sars Diaptomus gracilis is a well-known Eurasian species new to NorthAmerican fauna. It has been found recently in several of my Alaskancollections. It appears to be common in the Arctic regions of Alaska,having been found on the western coast (lakes of the lower YukonRiver and Bristol Bay areas) and on the Arctic slope at Umiat. Insouth-central Alaska it occurred in collections of the Kuskokwim Riverarea at McGrath and in Wonder Lake, Mount McKinley NationalPark. DIAPTOMUS (AGLAODIAPTOMUS) MARSHIANUS, new species Figures 43-51 Type lot.—13 females, 45 males. Lake Jackson, Leon County, Fla.,April 3, 1950, Murray H. Voth collector. Holotype female, 22 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 122. Figs. 43-58.—(See legend on opposite page.) NO. 2 COPEPODS OF THE GENUS DIAPTOMUS—WILSON 23 No. 94634; allotype male, No. 94635. Occurring with D.(Arctodiaptomus) floridanns Marsh and D. (Skisto diaptomus) mis-sissippiensis Marsh. Diagnosis.—Length, dorsal view: Female, mm.; male, mm. Greatest width of female in segments 2 and 3, equalingabout 28 percent of the length. Metasomal segment 5 with an unusualdorsal protuberance consisting of an erect cuticular frill, placed mostlyon the right side. The wings of the last segment not produced laterally,the inner portion rounded so as to form a lobe in dorsal view. Urosome of female 3-segmented. Genital segment noticeably asym-metrical, the right side being very tumid. Caudal rami longer thansegment 3, 25: 20, their width 64 percent of their length, ciliate oninner margin only; the inner dorsal seta as long as the inner caudalseta. Antennules reaching beyond the caudal
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