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North American Entomolomst 



Editor: A. R. GROTE. 

 Buffalo Society of Natural Sciences. 



Publishers: REINECKE & ZESCH. 

 500 Main Street, Buffalo, N.Y. 



Vol. X. 



FEJERXJA-RY, ISSO. 



]>jo. ». 



A Larval Argulus. 



By D. 8. Kellicott, Buffalo, N. Y. 



During the past summer I frequently found clinging to two 

 different species of fisli taken from the Niagara a large Argulus be- 

 lieved to be hitherto undescribed. The results of my observations 

 upon the adult I have in manuscript. I propose in this paper to 

 give an account of the larva of this species and» to point out certain 

 morphological relations which appear to be indicated by its organization. 

 The eggs are left by the female in patches numbering from fifty 

 to three hundred, fastened to each other, and to supporting objects 

 under water by a frothy glutinous secretion ; they arc nearly round, 

 .4mm. in diameter, at first milk white, but soon changing to light 

 yellow; this alteration in color I find to be caused by some change 

 in the thick firm shell and not to the contents. I have in my notes 



the following record : Eggs left in 

 aquarium Aug. 28 ; Aug. 31 , a few 

 have a tinge of yellow; Sept. T, all 

 have p]jpiged completely; Oct. 5, under 

 a lens two black dots can be seen on 

 each egg ; Xov. 5, dissected the em- 

 bryos from the eggs and find the black 

 dots to be the eyes, the embryos well 

 formed exhibiting motion after re- 

 moval, I can make out the shield and 

 limbs in part, especially the natatory 

 legs ; Nov. 17, young ones appeared 

 swimifl^^ -w'ith agility. 



One of them served for my draw- 

 ing represented by the figure accom- 

 panying this paper. 



.-#'ra 



