sees aah asa ko eh ae a in iM Se ak 
ENTOMOSTRACA OF MINNESOTA. 89 
* First joint of the fifth foot broad. . . viridis, 90; americanus, 91; 
ingens, 92; vernalis, 92; robustus, 93; parcus, 93; 
brevispinosus, 95; uniangulatus, ¢6; leuckarti, 96; 
secourfieldi, 98; oithonoides, 98; dybowskii, 99; 
bisetosus, 99. 
** First joint of the fifth foot longer than wide. 
{+ Terminal segment of the fifth foot with one long seta and 
Oneshortspine. . . . . . Strenuus, 99; lacustris, 101. 
tt Terminal segment of the fifth foot with two rather long sete, 
pulchellus, 101; minnilus, 103; forbesi, 104. 
ttt Terminal segment of the fifth foot with threesete. . Signatus 105; 
var. coronatus, 106; var. tenuicornis, 106. 
III. Antenne 16-jointed, languidus, 107; modestus, 108; capilliferus, 109; 
ae Aubonne 14-lointed of a a tk eo. eo. msignis, 110: 
VY. Antenne 12-jointed. 
a. Fifth foot one-jointed. . . . serrulatus, 111; var. elegans, 112. 
macrurus, 113; prasinus, 113; fluviatilis, 114. 
b. Fifth foot two-jointed. . . . cGapillatus, 115; crassicaudis, 115; 
varicans, 116. 
VI. Antenne Ll-jointed. . . gracilis, 117; diaphanus, 117; affinis, 117; 
bicolor, 118. 
VII. Antenne 10-jointed. Tee eos eee ee DR ALerAatuss 1:20) 
VIII. Antenne eight-jointed. . . ..... =... . .*fimbriatus, 121. 
IX. Antenne six-jointed. .... . 3 . . . equoreus, 122. 
The forms which have been boponked with is -jointed antennze may 
not necessarily be representatives of a single species but may be spor- 
adie instances of reduplication in the antennal segments on the part 
of various 17-jointed forms. Cyclops elongatus Claus, the only named 
species with 18-jointed antenne, is confidently identified with C ver- 
nalis Fischer, by Schmeil, nevertheless Claus’ description is as follows: 
‘*Length of body 2.5 mm., elongate, gradually narrowed toward the 
end. The anterior antennz 18 jointed, differing from the 17-jointed 
type by the separation of the seventh joint into two; they do not ex- 
tend far beyond the first segment of the cephalothorax. The fifth ab- 
dominal segment is strongly toothed. Rudimentary foot two-jointed, 
with relatively small basal joint and elongate terminal one, on whose 
apex is one long and one short seta. The stylets are longer than the 
two last abdominal segments, with relatively short sete, whose rel- 
ative size is nearly like those of ©. cuspidatus.”’ 
This species is reported by Cragin from near Cambridge, but has 
been seen by no other observer except the describer. 
* Cyclops ater Herrick. 
PLATES VI, Fias. 11, 12; XIJ, Fias. 9-12; X XI, Fias. 13-15, 17, 18. 
Herrick ’82, ’84, ’87; Turner ’92. 
Cephalothorax very large and broadly oval and usually conspicu- 
ously colored. Antenne as long as the cephalothorax (1.2 mm.), 
