110 GEOL. AND NAT. HIST. SURVEY OF MINNESOTA. 



tip of the antenna, and that upon the fourteenth far beyond it. The 

 first segment is as long as the two following, and very nearly twice as 

 long as wide. The second is very short, its length one fourth its 

 width, and the length and width of the third are equal Of the three 

 terminal segments the penultimate is longest, being twice as long as 

 broad 5 the antepenult two thirds the length of the following; the laSt 

 is about as wide as long. The armature of the legs is as follows: 



First Feet. 



spines. (ex. 2 setae. 



Outer ramus -j ap. 1 spine, 2 setis. Inner ramus < ap. 2 setae, 



setae. (in. 1 seta. 



rex. 2 

 \ ap. 1 

 (in. 3 



Second Feet. 



iex. 2 spines. fex. 3 setae. 



ap. 1 spine, 2 setae. Inner ramus < ap. 2 setae, 



in. 4 setae. i in. 1 seta. 



Third Feet. 



fex. 2 spines. ( ex. 1 seta, 



ap. 2 setae. Inner ramus J. ap. 2 setae, 



iu. 4 setae, i in. 3 setae. 



Fourth Feet. 



iex. 2 spines. fex. 1 seta. 



ap. 2 setae. Inner ramus < ap. 2 sette. 



in. 4 setae. i in. 2 setae. 



The fifth feet are two jointed, the terminal joint with one long and 

 one short seta at tip: the basal joint with one long seta without. 

 Length without set?e 1.2 mm. Grebe lake, Yellowstone Park. 



* Cyclops insignis Clans. 

 Plates XXII, Figs. 11-14; XXIII, Figs. 6, 7. 



Clans '57 and '63; Sars '63; Fric '72; Brady '68 (lubbockii) and '78 and '91; Rehberg 

 '80; Herrick '84; Richard '91; Schmeil '91 and '92. 



Schmeil has doubtfully identified G. liibhocldi Brady with the brack- 

 ish varieties of G. bicuspUMus = G. helgolandicus Eehberg. Though 

 the names are given in the synonomy above, it is with the under- 

 standing that they at least constitute a distinct variety. 



The typical form has an elliptical cephalothorax, the first segment 

 beiDg more than half as long as the remainder. The abdomen is rela- 

 tively short and its first segment greatly expanded. The stylets are 

 very long, fully half as long as the rest of the abdomen, and are longi- 

 tudinally ridged as in G. strenuus. The lateral apical setse are short, 

 while the median ones are long and more nearly equal than usual. 

 Antennee 14-jointed, not much longer than the first segment of thorax, 

 similar to G. sfrenuus. Fifth foot exactly as in G. strenuus. Length 

 2.5 to 5.0 mm. 



