ENTOMOSTBACA OF MINNESOTA. 247 



diocres gerenti, postice angulum obtusum, inermem formante; cauda brevi, apicem 

 versus rotundatum dilatata, margine dorsali utrinque serie marginali aculeorum 

 7-8 sensim minorum et pleuribus minimorum sequalium armata; unguibus caudali- 

 bus inermibus dente basali uno. Longit. fern., 0.4-0.48; alt. 0.18-0.22 mm." 



While doubting the integrity of this species we are unable to place 

 it and quote the author's description. 



Alona eleg-ans Kurz. 



Plate LXII, Fig, 14. 



Form rectangular; back slightly elevated, posterior margin high, 

 lower margin straight. Shell covered with minute striations spring- 

 ing from the region of the attachment of the head shield. Head 

 rather large, pigment fleck smaller than the eye. The antennte have 

 eight setse and a circlet of spines on the second joint of the inner 

 ramus, and a single thorn on its first joint. The post- abdomen is 

 short and broad, rounded at the end, and is armed with about ten 

 anal teeth and a lateral row of scales. Length 0.4 mm. to 0.5 mm, 



* Alona augfulata Birge. 



Dorsal margin considerably arched, terminating in a more or less 

 obvious angle at the hinder corner; the hinder edge is convex, as is 

 also the front margin; the ventral margin bears plumose sette. Beak 

 pointed, extending nearly to level of ventral margin of the valves. 

 Fornices broad. Shell obviously striated diagonally and less obviously 

 marked by cross lines. Post-abdomen broad, truncate; about twelve 

 anal teeth, with a series of scales and hairs back of them. The pig- 

 ment fleck is much smaller than the eye. Male smaller; beak shorter; 

 post-abdomen with a lateral row of hairs; anterior feet hooked; 

 sculpture less distinct. [Birge.] Length of female 0.4 mm.; male 

 0.35 mm. 



Whether Professor Birge still continues this species does not ap- 

 pear, but it is dropped from the list of Madison Cladocera. 



Alona coronata Kurz. 



Hellich identifies this with his A. pulchra, but with Matile we re- 

 gard this as doubtful. The resemblance to A. pulchra [i'nieata'] is very 

 close, the outline being identical. The lower margin is sparsely 

 hairy. The beak is blunt. A half circlet of teeth ornaments the end 

 of the middle segment of the inner ramus of the antennae. The macula 

 is but little smaller than the eye. The post-abdomen is broad as in 

 A. elegans, not narrowed at the end, but broadly rounded. The anal 



