ENTOMOSTRACA OF MINNESOTA. 259 



Pleuroxus personatiis Leydig. 



Leydig '60 (Lynceas personatus); Schoedler '62, '63 (Rhypophilus personatus and 

 glaber); Norman and Brady '67 (Lynceus uncinatus); Miiller '68; Fric '72 

 (Lynceus personatus); Hellich '77 (personatus and glaber); Herrick '84; Daday 

 '88; Matile '90; Kurz '74 (glaber). 



Shell high, oval, smaller caudad. Head small, depressed, with 

 narrow, long, procurved beak. Macula quadrangular, half the size 

 of the eye, to which it is nearer by half than to the end of the beak. 

 The shell is either hexagonally reticulate or smooth. The lower 

 margin is flexed cephalad of the middle and bears long cilia. The 

 ventro-caudal angle bears two curved spines. The post-abdomen is 

 rather broad, narrowed toward the end. Anal teeth 10-11, very large. 

 €law serrate, and with two basal spines. There are seven setse and a 

 spine upon the antennae. The antennules ar^ fusiform. Length 0.65 

 to 0.67 mm. 



There seems to be no reason to doubt that P. glaber is only a condi- 

 tion of P. personatus not even worthy of a varietal name. 



Pleuroxus {RhypopMhis) uuciuatus Baird. 



The shell is ridged with lines running upward and backward, as 

 in P. bairdii; the lower angle of the shell has three teeth, and the 

 beak is more horizontal than in the above. In size and characters 

 this is almost identical with P. bairdii, with which it occurs in Eng- 

 land. 



This completes the list of swine-like members of the genus; these 

 well deserve to be studied from a morphological standpoint. 



The following names may be mentioned, though the list of syno- 

 nyms cannot claim to be exhaustive. 



Pleuroxus nasutus Gay is a poorly described form from Chili, re- 

 sembling, according to Schoedler, P. ornatus = trigoneUus. 



A species of Fercantha (Lynceus armatus Gay) is found in Chili. 



P. exiguus Lillj. is Alonella. 



P. griseus is possibly Alonella pygrmea but is said to have two teeth 

 on the ventro-caudal angle of the shell which is faintly reticulated as 

 well as striate. 



P. striatus Hellich is P. gracilis Hudendorff. 



P. striatus Schoedler is Alonella. 



P. balatonicus Daday is insufficiently described. 



P. excisus Fischer is Aloyiella. 



P. nanus Baird is Alonella pygmcea. 



P. Icevis Sars is P. hastatus. 



P. ornatus Schoedler is the young of P. trigonellus. 



P. trigonellus Mueller is P. bairdii Schoedler. 

 17 



