STATE GEOLOGIST. 249 



description of Kurz and does agree very well w th what is said of L. 

 acanthocercoides. However, Kurz says of the latter species, "Diese Art 

 is von der vorangehenden {L. acanthocercoides) im. weiblichen Gresch- 

 lecht schwierig zu unterscheiden,'' and immediately adds that the male 

 is unknown to him. In P. E. Miiller's time both males were 

 unknown. Miiller says of acanthocercoides, "ungues caudales 

 inermes," oi quadrangular is, "ungues caudales dente minuto." Kurz on 

 the other hand says of the former, "der Basaldorn ist kurz," of the 

 latter "die Endklauen haben keinen Basaldorn." 



Our species has no spine on the claws, and has a small spine on an 

 eminence on the dorsal part of the abdomen, as well as two ciliated 

 prominences between it and the oval setae ; length ^^ cm. ; color red. 



Silver Lake, east of Minneapolis. 



CAMPTOCEKCUS MACROURUS. 



(Plate X, fig. 9.) 



This large species occurs rather sparingly at Lake Minnetonka. It 

 is probably widely distributed in America as well as Europe. It is 

 known in Cambridge, Mass. and Madison, Wis. (Birge). 



GAMPTOCERCUS ROTUNDUS, Sp. nOV. 



(Plate yill, figs. 9-10.) 



Short, quadrangular, dorsally nearly uniformly arched; antennae of 

 first pair long, curved outward, with long terminal bristles; abdomen 

 long, nearly uniform in width; teeth of post- abdomen few, inconspicu- 

 ous; terminal claw nearly straight; basal spine large; the claw also has 

 a series of spines beginning a little beyond the middle and shortening 

 proximally; length ^ J^ cm. This resembles C. rectirostris, Schodler, a 

 little in outline of body but the head is like C. macrourus, except that 

 there is a slight beak directed anteriorly (not shown in the figure) ; the 

 post-abdomen is much as in C. macrourus, but is less heavily spined. 

 In size it is somewhat less than C. Ufljehorgii, and the shortest species 

 known to me. 



ACROPERUS sp? 



(Plate X, fig. 10.) 



Resembles Camptocercus macrourus greatly. Are these two genera 

 really distinct? 



