296 GEOL. AND NAT. HIST. SURVEY OF MINNESOTA. 



In both males and females the antennae are six-jointed. The nata- 

 tory setse extend to beyond the tips of the terminal claws. 



There is no branchial jDlate on the second maxilla. The palp of 

 this jaw is two-jointed. In the female the distal joint is short and 

 cylindrical, bearing at its apex two short set®; in the male the distal 

 joint forms a long scythe-shaped appendage. 



The second foot is five jointed, terminating in three setse, two of 

 which are directed backwards. 



The two eyes are not confluent. 



The abdominal rami are long and slender. Males are numerous. 

 The cylindrical core of Zenker's organ (verticillate sac) is ornamented 

 with numerous closely set whorls of short stout spines. 



Notodromas nionacha (0. F. Miiller). 



Plate LXXII, Fig. 4-4'>. 



1183.— Cypris monacJia O. F. Miiller (149), p. 60, Taf. V, Figs 6-8. 



1820. — Monoculus monachus, Jurine (9S), p. 173, PI. XVIII, Figs. 13-14. 



IS'Sl.—Cypris tariabilis Koch (102), H. 10, 3. 



1837.— " lenco7nela Koch (102), H. 10, 4. 



1837.— " monacha Koch (102), H. 11, 1. 



1837.— " himuricata Koch (102), H. 11, 2. 



1837.— " nuhilosa Koch (102), H. 12, 4. 



1814.- " monacha Zaddach (234), p. 31. 



1850.— " monacha Baird (2), p. 153; PI. IV, Figs. 1-11. 



1851.— " monacha Fischer (64), p. 146. 



i853.—Noiodroma monachus Lilljeborg (1 18), p. 95; Taf. VIII, Figs. 1-25; Taf. XII, 



Figs. 1 3; Taf. XXV, Fig. 16. 

 185i.—Cyprois monacha Zenker (23S), p. 80; PI. Ill, C. 

 1868.— " monacha Plateau (169), p. 60; PL I, Figs. 22-23. 

 1868.— Notodromas monachus Brady (18), p. 379; PI. XXIII, Figs. 1-9; PI. 



XXXVII, Fig. 3. 

 1870. — Notodromas monachus Heller (81), p. 78. 

 1872.— Cypris monacha Fric (69), p. 228. 

 1830. — Notodromas monachus Eohevtson (184), p. 22. 

 1882. — " monachus Herrick (85), p. 252. 



1885. — " monachus Nordquist (155), Pis. I, II aud IV. 



18S7. — " monachus Korsch.igen (104), p. 24. 



1888. — Cyprois monacha Schwarz (199), p. 11. 

 1889. — Notodromas monacha Brady «% Norman (31), p. 96. 

 1891.— " monrtc/irt Wenzel Vavra (221), pp. 32-39; Figs. 7 9. 



This species does not seem to be as abundant in America as in 

 Europe. I have never encountered it. The figures that accompany 

 this description are Professor Herrick's (86), aud the following diag- 

 nosis is due to Professor Brady (18): 



"Male. — Carapace obliquely sub-quadrangular, greatest height 

 equal to two thirds of the length, situated in the middle. Anterior 



