442 Illinois State Lahoratori/ of Natural History. 



Caudal rami (Fi^. 4) straight, weakly bent near the 

 end, from ten to twelve times as long as wide, and very 

 faintly toothed on the dorsal margin. Terminal claw 

 Blender, straight, finely toothed at its extremity, and 

 nearly three fifths as long as the ramus; subterminal 

 claw five sevenths as long as the terminal claw, straight. 

 Terminal seta slender, short, of the same length as the 

 dorsal one, which is one third the length of the sub- 

 terminal claw and distant from it the width of the 

 ramus. 



This species occurred in April, 1884, in great numbers 

 in a small grassy pool on the grounds of the Normal 

 University at Normal, 111. (Collection Illinois State Lab- 

 oratory of Natural History). According to Brady it seems 

 to make its home only in such pools, and is yet to be 

 found in lakes or large bodies of water. The species is 

 also known to occur in Great Britain, Sweden, Ger- 

 many, and Kussia. 



Cypris fuscata Jurine. (PI. XLIIL, Fig. 5 ) 



1820. Monomlus fuscatus, Jurine (36, p. 174, PL XIX., Fig. 1, 2). 



1837. d/pris adusta, Koch (38, Heft. XI., p. 3, Fig. 3). 



1838. Cypris galbinia, Koch (38, Heft. XXI., p. 19, Fig. 19). 

 1844. Cyj'jris fuscala, Zaddach (74, p. 32). 



1850. Cypris fusca, Baird (2, p. 154, Tab. XIX., Fig. 1). 

 1850. Candona hispida, Baird (3, p. 161, Tab. XIX., Fig. 4). 



1853. Cypns fuscata, Lilljeborg (39, p. 114, Tab. X., Fig. 6-9; 



XII., Fig. 5). 



1854. Cypris fuscata, Zenker (75, p. 73). 



186S. Cypris fusca, Brady (6, p. 362, PI. XXIII., Fig. 10-15). 



1887. Cypris dugesi, Herrick (34, p. 26, PI. IV., Fig. 7). 



1888. Cypris fusca, Sostaric (60, p. 47). 



1889. Cyprisfuscata, Brady & ISTorman (9, p. 73, PI. XII., Fig. 3, 4). 

 1891. Cyprisfuscata, Vavra (68, p. 98, Fig. 33^-33^ ). 



1893. Cyprisfuscata, Daday (19, p. 292). 



1894. Cypris fuscata. Turner (64, p. 16, Pi. VIII., Fig. 41-46. 



1895. Cypris fuscata, Turner (35, p. 320, PI. LXXI., Fig. 41-46; 



LXXII., Fig. 7, 7p: LXXVI., Fig. 9). 



Length 1.46 mm., height .82 mm., width .76 mm. 

 Color yellowish brown with a bluish black patch 

 on f'ither side nea?" tlie middle and just posterior to a 



