24 



R. E. COKER. 



quickly reestablished. . . . There are probably other species 

 of Oligochseta in addition to the three named in your list. I 

 know that I found Enchytrceus alhidus (= Halodrilus littoralis) 

 on the strand and one of the small Naiidae in fresh water but 

 these records also are not available just at present." 



Discussion of Results. 

 As will later be shown in detail, animals of 216 species were 

 taken and subsequently identified, and these, grouped by phyla 

 and lesser subdivisions, are distributed as follows: 



Number of Species of Animals Collected from Penikese 

 Island, August, 1923. 



Annelids 3 species 



Mollusks I " 1 



Arthropods : 



Crustacea 2 " 



Myriapods i " 



Insects 162 " 



Arachnids 15 " 



Vertebrates : 



Amphibia i " 



Reptiles i " 



Birds (actually resting on the island) 29 



Mammals i " 



Total 216 



Insects by Orders: 



Odonata 3 



Orthoptera 8 



Hemiptera (terrestrial 20, aquatic 6) 26 



Neuroptera 2 



Lepidoptera 13 



Diptera 47 



Coleoptera (terrestrial 30, aquatic 24) 54 



Hymenoptera 9 



Total number of species of insects 162 



It is worth while to allude to certain groups that are not 

 represented in the list. Although a thorough search was made 

 for fish in the brackish and freshwater ponds, none were found. 

 Since isolation is not usually sufiicient to account for the want 

 of small fish in ponds, even such as may occasionally become 



^ An aquatic gastropod lost before identification. 



