662 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 43. 



These findings of Alonopsis are the' only ones for this genus in 

 America. Alonopsis elongata has been known all over Europe ^ 

 for many years. Alonopsis aureola has not been heretofore known. 

 All the specimens found in America of both species are from the 

 alimentary tracts of young fish, by whom they had been seized as 

 food. 



All the specimens of the black bass in question were captured around 

 rocks in several feet of water immediately oft' shore. There was 

 Accessible near by, at a distance of 50 to 75 meters, a weedy cove. 

 The food with which Alonopsis was associated was predominantly the 

 Entomostraca of the open lake which had risen to the surface at 

 night and spread to the shore. These the young black bass fed upon 

 according to their habits in this lake. There were also a few Poly- 

 pliemus pediculus (Linnaeus), which prefer clear water several feet in 

 depth near shore, but may occur anywhere. There was also a good 

 sprinlding of true littoral and hydrophytophilous forms as Cerio- 

 dapJinia reticulata (Jurine), Acroperus Jiarpse Baird, various species 

 of Alona, etc. Therefore the habitat of the two species of Alonopsis, 

 as they occur in Sebago Lake, is not indicated precisely. 



The golden trout of Sunapee Lake is also a lake species, breeding, 

 so far as known, only on a shoal in mid lake. The young trout 

 referred to had eaten along with Alonopsis aureola only Polyphemus 

 pediculus, which lives, as mentioned, mainly in littoral waters free 

 from weeds. The trout were taken in such a place, but they had 

 access at 100 meters distance to a weedy brook, or, perhaps, the 

 inhabitants of the weedy brook had access to them. During another 

 season Doctor Kendall took young Sunapee golden trout from this 

 brook. Except for two Cyclops the food of this second lot of young 

 trout was insects exclusively, in larval, pupal, and adult stages. 



At Sebago Lake the effort to find specimens of Alonopsis alive was 

 thorough, but neither around the rocks where the bass were captured 

 nor in the weedy cove could they be found. Neither did the young 

 of other species of fish such as catfish, Ameiurus nehulosus; or yellow 

 perch, Perca jiavescens; chub, Semotilus hullearis; or sucker, Catos- 

 tomus commersonii, which frequented the cove, and fed abundantly 

 upon Entomostraca yield any specimens ol either species. The 

 chances of fuiding a species of Entomostraca in the cove, if it occurs 

 there, are so much better than those of finding it off the rocky shore, 

 if it occurs there, that the conjecture is hazarded, that in New England 

 lakes Alonopsis elongata and Alonopsis aureola may rarely be found, 

 especially in the early morning, in clear littoral waters several feet 

 in depth, under the protection of rocky ledges or banks. 



1 Wilhelm Lilljeborg. Cladocera Suecise. Nova Acta Regise Societatis Scientarium Upsaliensis, Seriei 

 Tertiae, vol. 19. 1900. 



