A DISCCSSIOX OF CYCLOPS VIRIDIS JURIXE. 



ROBERT CHAMBERS, JR. 



Bl(II.(H,I< AI. I.AIiuK.UiiKY. CoLCMlilA UNIVERSITY. 



Cyclops I'iritlis Jurinc, or, as it was formerly called, Cyclops 

 l>nriirnis Clans, tin- object <>f tin- classic researches of Hacckcr. 

 i- de-i ribed ,i~ beiny repre-ented in North America in the form 

 ni' -r\ i-ral varieties. 



('. huiuht Mar-h i" . in hi- n-\ i-ion of the North American 

 spei ies of ( 'y< laps. di\ ide-, tin- -|H , ies :iri<lis into four varieties: 

 \ar. ingens Ht-rrick. \ar. f>r<-:isf)inosiis Hrrrirk, \\ir. fxircns 

 Ili-rrick. and \ ar. Amcricanm M.n-h. 



7;/i'--//N inrhidr- tin- l.ir^c-i lonn- of the species and possiblj 



<<>\\< -ponds to tin- l-".nro|n-an \.ir. > Ian-. 



Anicricanus is the nm-i aluindani \ariei\ of ::ridis in . \ineri- 

 t.in u.iiei>. It is to lie HUM \\ith in alnm-i .ui\ dilch or >niall 

 |tond. Pnrcus i> nuirh more local in ii- haunt- luit in the 

 localitii - \\ here it is to be found il may be abundantiy represented. 

 [ have never found the two \arieiii her. run /o i-, on the 



average, >maller than Amerlcnniis. 



In the ,iccipin|ian\ inn table I ha\i- indicated the main lealnres 

 di-linmii-hin^ the |-airo|ean and the t\\o la-l ineiitioiu-d Ameri- 

 can \ ai if 



The inner margin of the hi real rami o| I he tail i- ne\-er ciliated 

 in the luo American \arietie- as it i> in the |-".nro|>ean form. 



The rudimentary fifth thoracic appendage of the Iuin>|iean 



Tiridi* ' see laMe . i- described 1>\ Schm^il '92 as ha\ in-^ the -mall 



>pine on the inner margin of the -I'cond -eminent either a mere 

 culicnlar ])rotul icrance or connected \\ith th.i' . ien1 \>\ a dis- 

 I in. t joint. The la Her feature is characteristic ol the t\\o Ameri- 

 can \ arielie- -ee tal'K . 



The numluT of -pine- on the terminal se-nients of the outer 

 rami of the four -\\imiiiiiii; appendage- in the luiropean liridis 

 and in parcns are t \\ o for the first pair of appendages and three 



- l 



