Xoiili AxuTKuiii ( 'ciitrojxiriithf. '229 



of Illinois, Indiana, Ohio, Mieliij^an, ^\ asliiugton, Oregon, 

 Montana, Wyoming, Idaho, and Nevada. 



Through the kindness of Professor Smith I was able to 

 examine collections from Lake George and Lake James in 

 Steuhen Connty, Ind., in which I found specimens of Epis- 

 rhura JacKstri-s and 1 >iiipti>iiii(s orcfjonensis. Mr. Chancey 

 Juday, Curator of Collections, University of Indiana, kindly 

 sent me collections from Tippecanoe Lake, Eagle Lake, and 

 Turkey Lake, in Indiana, in which occurred Epischura laciin- 

 trU, Diapto)nuii slc'ilh, 1>. ori'fionen-sis, and D. siciloides. I also 

 acknowledge my indebtedness to Prof. G. 0. Sars, who kindly 

 furnished me with specimens of L'nnnordlaniis grimald't'i, thus 

 enabling me to compare them with L. iinicrurus — also fur- 

 nished by him to the Illinois State Laboratory of Natural 

 History; to Herr S. A. Poppe, for specimens of LimnocahiniiH 

 ■"ihtensi^ ; to Professor Lillejeborg for Eplschiira Jievadensis ; 

 and to Dr. C. A. Kofoid, Superintendent of the Illinois Biolog- 

 ical Station at Havaiux, to whom I owe thanks for his many 

 kindnesses during my stay at the Station in July, 1896, and 

 while at the University. 



No illustrations accompany this paper, since the species 

 treated may ])e identiiied by figures already published. 



OSPHRANTICUM FoKBES. 



Osphranticum. Forbes. 'S2a, p. 04."t. 

 rotomoichetof*, Herrick, '82. p. 2,5. 

 Osphrantlcwn, Herrick, "84, p. 134. 

 Osphranticum, Herrick, '87, p. 12. 

 Osphranticum, de Guerne et Richard, "89b. p. IJ'J. 

 Osphranticum, Herrick and Turner, '!)5, p. 85. 



Cephalothorax compact, six-segmented, the first two seg- 

 ments confluent above, the last segment produced into a 

 bluntly-rounded lobe on each side. Abdomen (furca in- 

 cluded) composed of five segments in the female, of six in 

 the male. Unreal rami hairy on the inner margins ; armed 

 with live plumose setaj, the second from within the longest, 

 and with a delicate smooth seta on the inner margin of the 



*Sj>elled Fotamoichetor in Ilerriek's siibseiiuent references. 



