ENTOMOSTRACA OF MINNESOTA. 245 
meshes. Post-abdomen short and wide, rounded at the end, orna- 
mented by seven or eight clusters of minute spines behind as well as a 
lateral row of scales. Length 0.43 mm. 
Hellich says the pigment fleck is larger than the eye and is farther 
from the end of the beak than from the eye. 
Alona pulchra Hellich. 
Sars ’61 (rectangula and lineata); Hellich ’74 and ’77 (lineata); Matile ’90. 
We are influenced by Matile in not recognizing A. lineata Fischer 
and substituting Hellich’s name. Alona lineata of Kurz is said by 
Matile to be A. costata Sars. 
Body small, elongate oval, truncate behind and of a pale color. 
Greatest height near the middle. The upper margin is rounded, the 
lower one somewhat sinuate, with sete of moderate length. The beak 
is short, reaching nearly to the level of the lower margin of the shell; 
the pigment fleck is one half the size of the eye, to which it is much 
nearer than to the end of the beak. Post-abdomen short, broad and 
tapering toward the end, truncate, armed with seven to eight large 
teeth; short caudal claws with a small basal tooth. Shell marked 
with distinct lines running horizontally. The ephippial females are 
recognized by a deep color and the greater elevation of the back 
Length 3.8 to 4.00 mm. 
I am unable to satisfactorily differentiate the species of this group. 
* Alona costata Sars. 
PLATE LX, Fie. 3. 
Alona lineata—Schoedler, Kurz, P. E. Mueller. 
Alona modesta—Herrick. 
We need not attempt to unravel the perplexing synonomy. As 
thus defined the species seems to be common in Europe and America. 
Shell quadrangular, widest behind the middle. Beak of moderate 
length. Pigment fleck smaller than the eye and midway between eye 
and beak. Antenne with only seven setze. Labrum small. ‘The shell 
is strongly and coarsely striped parallel to the shell margins. Lower 
margin straight or concave, armed with rigid sete. Ccecum long. 
Post-abdomen rather short, acute and excavated at the distal end. 
Anal spines nine or ten, equal, with a secondary series of scales. 
Claws smooth, except for a basal spine. Length 0.55 to 0.65 mm. The 
claw of the male lacks the basal spine. 
The Minnesota representative of this widely distributed species 
differs in some respects. The lower margin is nearly straight and 
